func (s *TestSuite) TestForgetMaster(c *C) {
_, _ = inst.ReadTopologyInstance(&masterKey)
_, found, _ := inst.ReadInstance(&masterKey)
c.Assert(found, Equals, true)
inst.ForgetInstance(&masterKey)
_, found, _ = inst.ReadInstance(&masterKey)
c.Assert(found, Equals, false)
}
func (s *TestSuite) TestDiscover(c *C) {
var err error
_, err = db.ExecOrchestrator("delete from database_instance where hostname = ? and port = ?", masterKey.Hostname, masterKey.Port)
_, err = db.ExecOrchestrator("delete from database_instance where hostname = ? and port = ?", slave1Key.Hostname, slave1Key.Port)
_, err = db.ExecOrchestrator("delete from database_instance where hostname = ? and port = ?", slave2Key.Hostname, slave2Key.Port)
_, err = db.ExecOrchestrator("delete from database_instance where hostname = ? and port = ?", slave3Key.Hostname, slave3Key.Port)
_, found, _ := inst.ReadInstance(&masterKey)
c.Assert(found, Equals, false)
_, _ = inst.ReadTopologyInstance(&slave1Key)
logic.StartDiscovery(slave1Key)
_, found, err = inst.ReadInstance(&slave1Key)
c.Assert(found, Equals, true)
c.Assert(err, IsNil)
}
// GetCandidateSiblingOfIntermediateMaster chooses the best sibling of a dead intermediate master
// to whom the IM's slaves can be moved.
func GetCandidateSiblingOfIntermediateMaster(intermediateMasterKey *inst.InstanceKey) (*inst.Instance, error) {
intermediateMasterInstance, _, err := inst.ReadInstance(intermediateMasterKey)
if err != nil {
return nil, err
}
siblings, err := inst.ReadSlaveInstances(&intermediateMasterInstance.MasterKey)
if err != nil {
return nil, err
}
if len(siblings) <= 1 {
return nil, log.Errorf("topology_recovery: no siblings found for %+v", *intermediateMasterKey)
}
sort.Sort(sort.Reverse(InstancesByCountSlaves(siblings)))
// In the next series of steps we attempt to return a good replacement.
// None of the below attempts is sure to pick a winning server. Perhaps picked server is not enough up-todate -- but
// this has small likelihood in the general case, and, well, it's an attempt. It's a Plan A, but we have Plan B & C if this fails.
// At first, we try to return an "is_candidate" server in same dc & env
log.Infof("topology_recovery: searching for the best candidate sibling of dead intermediate master")
for _, sibling := range siblings {
sibling := sibling
if isValidAsCandidateSiblingOfIntermediateMaster(intermediateMasterInstance, sibling) &&
sibling.IsCandidate &&
sibling.DataCenter == intermediateMasterInstance.DataCenter &&
sibling.PhysicalEnvironment == intermediateMasterInstance.PhysicalEnvironment {
log.Infof("topology_recovery: found %+v as the ideal candidate", sibling.Key)
return sibling, nil
}
}
// Go for something else in the same DC & ENV
for _, sibling := range siblings {
sibling := sibling
if isValidAsCandidateSiblingOfIntermediateMaster(intermediateMasterInstance, sibling) &&
sibling.DataCenter == intermediateMasterInstance.DataCenter &&
sibling.PhysicalEnvironment == intermediateMasterInstance.PhysicalEnvironment {
log.Infof("topology_recovery: found %+v as a replacement in same dc & environment", sibling.Key)
return sibling, nil
}
}
// Nothing in same DC & env, let's just go for some is_candidate
for _, sibling := range siblings {
sibling := sibling
if isValidAsCandidateSiblingOfIntermediateMaster(intermediateMasterInstance, sibling) && sibling.IsCandidate {
log.Infof("topology_recovery: found %+v as a good candidate", sibling.Key)
return sibling, nil
}
}
// Havent found an "is_candidate". Just whatever is valid.
for _, sibling := range siblings {
sibling := sibling
if isValidAsCandidateSiblingOfIntermediateMaster(intermediateMasterInstance, sibling) {
log.Infof("topology_recovery: found %+v as a replacement", sibling.Key)
return sibling, nil
}
}
return nil, log.Errorf("topology_recovery: cannot find candidate sibling of %+v", *intermediateMasterKey)
}
func (s *TestSuite) TestReadTopologyAndInstanceSlave(c *C) {
i, _ := inst.ReadTopologyInstance(&slave1Key)
iRead, found, _ := inst.ReadInstance(&slave1Key)
c.Assert(found, Equals, true)
c.Assert(iRead.Key.Hostname, Equals, i.Key.Hostname)
c.Assert(iRead.Version, Equals, i.Version)
}
func getClusterName(clusterAlias string, instanceKey *inst.InstanceKey) (clusterName string) {
var err error
if clusterAlias != "" {
clusterName, err = inst.ReadClusterByAlias(clusterAlias)
if err != nil {
log.Fatale(err)
}
} else {
// deduce cluster by instance
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatalf("Unable to get cluster instances: unresolved instance")
}
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
clusterName = instance.ClusterName
}
if clusterName == "" {
log.Fatalf("Unable to determine cluster name")
}
return clusterName
}
func (s *TestSuite) TestReadTopologyAndInstanceMaster(c *C) {
i, _ := inst.ReadTopologyInstance(&masterKey)
iRead, found, _ := inst.ReadInstance(&masterKey)
c.Assert(found, Equals, true)
c.Assert(iRead.Key.Hostname, Equals, i.Key.Hostname)
c.Assert(iRead.Version, Equals, i.Version)
c.Assert(len(iRead.SlaveHosts), Equals, len(i.SlaveHosts))
}
func validateInstanceIsFound(instanceKey *inst.InstanceKey) (instance *inst.Instance) {
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
return instance
}
// discoverInstance will attempt discovering an instance (unless it is already up to date) and will
// list down its master and slaves (if any) for further discovery.
func discoverInstance(instanceKey inst.InstanceKey) {
start := time.Now()
instanceKey.Formalize()
if !instanceKey.IsValid() {
return
}
if existsInCacheError := recentDiscoveryOperationKeys.Add(instanceKey.DisplayString(), true, cache.DefaultExpiration); existsInCacheError != nil {
// Just recently attempted
return
}
instance, found, err := inst.ReadInstance(&instanceKey)
if found && instance.IsUpToDate && instance.IsLastCheckValid {
// we've already discovered this one. Skip!
return
}
discoveriesCounter.Inc(1)
// First we've ever heard of this instance. Continue investigation:
instance, err = inst.ReadTopologyInstance(&instanceKey)
// panic can occur (IO stuff). Therefore it may happen
// that instance is nil. Check it.
if instance == nil {
failedDiscoveriesCounter.Inc(1)
log.Warningf("discoverInstance(%+v) instance is nil in %.3fs, error=%+v", instanceKey, time.Since(start).Seconds(), err)
return
}
log.Debugf("Discovered host: %+v, master: %+v, version: %+v in %.3fs", instance.Key, instance.MasterKey, instance.Version, time.Since(start).Seconds())
if atomic.LoadInt64(&isElectedNode) == 0 {
// Maybe this node was elected before, but isn't elected anymore.
// If not elected, stop drilling up/down the topology
return
}
// Investigate slaves:
for _, slaveKey := range instance.SlaveHosts.GetInstanceKeys() {
slaveKey := slaveKey
if slaveKey.IsValid() {
discoveryQueue.Push(slaveKey)
}
}
// Investigate master:
if instance.MasterKey.IsValid() {
discoveryQueue.Push(instance.MasterKey)
}
}
// discoverInstance will attempt discovering an instance (unless it is already up to date) and will
// list down its master and slaves (if any) for further discovery.
func discoverInstance(instanceKey inst.InstanceKey) {
instanceKey.Formalize()
if !instanceKey.IsValid() {
return
}
if existsInCacheError := recentDiscoveryOperationKeys.Add(instanceKey.DisplayString(), true, cache.DefaultExpiration); existsInCacheError != nil {
// Just recently attempted
return
}
instance, found, err := inst.ReadInstance(&instanceKey)
if found && instance.IsUpToDate && instance.IsLastCheckValid {
// we've already discovered this one. Skip!
return
}
discoveriesCounter.Inc(1)
// First we've ever heard of this instance. Continue investigation:
instance, err = inst.ReadTopologyInstance(&instanceKey)
// panic can occur (IO stuff). Therefore it may happen
// that instance is nil. Check it.
if instance == nil {
failedDiscoveriesCounter.Inc(1)
log.Warningf("instance is nil in discoverInstance. key=%+v, error=%+v", instanceKey, err)
return
}
log.Debugf("Discovered host: %+v, master: %+v", instance.Key, instance.MasterKey)
if !isElectedNode {
// Maybe this node was elected before, but isn't elected anymore.
// If not elected, stop drilling down to further investigate slaves.
return
}
// Investigate slaves:
for _, slaveKey := range instance.SlaveHosts.GetInstanceKeys() {
discoveryInstanceKeys <- slaveKey
}
// Investigate master:
discoveryInstanceKeys <- instance.MasterKey
}
func (this *HttpWeb) ClusterByInstance(params martini.Params, r render.Render, req *http.Request, user auth.User) {
instanceKey, err := this.getInstanceKey(params["host"], params["port"])
if err != nil {
r.JSON(200, &APIResponse{Code: ERROR, Message: err.Error()})
return
}
instance, found, err := inst.ReadInstance(&instanceKey)
if (!found) || (err != nil) {
r.JSON(200, &APIResponse{Code: ERROR, Message: fmt.Sprintf("Cannot read instance: %+v", instanceKey)})
return
}
// Willing to accept the case of multiple clusters; we just present one
if instance.ClusterName == "" && err != nil {
r.JSON(200, &APIResponse{Code: ERROR, Message: fmt.Sprintf("%+v", err)})
return
}
params["clusterName"] = instance.ClusterName
this.Cluster(params, r, req, user)
}
func (s *TestSuite) TestMakeCoMasterAndBackAndFailOthersToBecomeCoMasters(c *C) {
clearTestMaintenance()
slave1, err := inst.MakeCoMaster(&slave1Key)
c.Assert(err, IsNil)
// Now master & slave1 expected to be co-masters. Check!
master, _, _ := inst.ReadInstance(&masterKey)
c.Assert(master.IsSlaveOf(slave1), Equals, true)
c.Assert(slave1.IsSlaveOf(master), Equals, true)
// Verify can't have additional co-masters
_, err = inst.MakeCoMaster(&masterKey)
c.Assert(err, Not(IsNil))
_, err = inst.MakeCoMaster(&slave1Key)
c.Assert(err, Not(IsNil))
_, err = inst.MakeCoMaster(&slave2Key)
c.Assert(err, Not(IsNil))
// reset slave - restore to original state
master, err = inst.ResetSlaveOperation(&masterKey)
c.Assert(err, IsNil)
c.Assert(master.MasterKey.Hostname, Equals, "_")
}
// Cli initiates a command line interface, executing requested command.
func Cli(command string, strict bool, instance string, destination string, owner string, reason string, duration string, pattern string, clusterAlias string, pool string, hostnameFlag string) {
if instance != "" && !strings.Contains(instance, ":") {
instance = fmt.Sprintf("%s:%d", instance, config.Config.DefaultInstancePort)
}
instanceKey, err := inst.ParseInstanceKey(instance)
if err != nil {
instanceKey = nil
}
rawInstanceKey, err := inst.NewRawInstanceKey(instance)
if err != nil {
rawInstanceKey = nil
}
if destination != "" && !strings.Contains(destination, ":") {
destination = fmt.Sprintf("%s:%d", destination, config.Config.DefaultInstancePort)
}
destinationKey, err := inst.ParseInstanceKey(destination)
if err != nil {
destinationKey = nil
}
if hostname, err := os.Hostname(); err == nil {
thisInstanceKey = &inst.InstanceKey{Hostname: hostname, Port: int(config.Config.DefaultInstancePort)}
}
postponedFunctionsContainer := inst.NewPostponedFunctionsContainer()
if len(owner) == 0 {
// get os username as owner
usr, err := user.Current()
if err != nil {
log.Fatale(err)
}
owner = usr.Username
}
inst.SetMaintenanceOwner(owner)
skipDatabaseCommands := false
switch command {
case "reset-internal-db-deployment":
skipDatabaseCommands = true
case "help":
skipDatabaseCommands = true
}
if !skipDatabaseCommands {
process.ContinuousRegistration(string(process.OrchestratorExecutionCliMode), command)
}
// begin commands
switch command {
// smart mode
case registerCliCommand("relocate", "Smart relocation", `Relocate a slave beneath another instance`), registerCliCommand("relocate-below", "Smart relocation", `Synonym to 'relocate', will be deprecated`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
_, err := inst.RelocateBelow(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case registerCliCommand("relocate-slaves", "Smart relocation", `Relocates all or part of the slaves of a given instance under another instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
slaves, _, err, errs := inst.RelocateSlaves(instanceKey, destinationKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range slaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case registerCliCommand("regroup-slaves", "Smart relocation", `Given an instance, pick one of its slave and make it local master of its siblings`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
lostSlaves, equalSlaves, aheadSlaves, promotedSlave, err := inst.RegroupSlaves(instanceKey, false, func(candidateSlave *inst.Instance) { fmt.Println(candidateSlave.Key.DisplayString()) }, postponedFunctionsContainer)
postponedFunctionsContainer.InvokePostponed()
if promotedSlave == nil {
log.Fatalf("Could not regroup slaves of %+v; error: %+v", *instanceKey, err)
}
fmt.Println(fmt.Sprintf("%s lost: %d, trivial: %d, pseudo-gtid: %d",
promotedSlave.Key.DisplayString(), len(lostSlaves), len(equalSlaves), len(aheadSlaves)))
if err != nil {
log.Fatale(err)
}
}
// General replication commands
// move, binlog file:pos
case registerCliCommand("move-up", "Classic file:pos relocation", `Move a slave one level up the topology`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
instance, err := inst.MoveUp(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case registerCliCommand("move-up-slaves", "Classic file:pos relocation", `Moves slaves of the given instance one level up the topology`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
movedSlaves, _, err, errs := inst.MoveUpSlaves(instanceKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range movedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case registerCliCommand("move-below", "Classic file:pos relocation", `Moves a slave beneath its sibling. Both slaves must be actively replicating from same master.`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if destinationKey == nil {
log.Fatal("Cannot deduce destination/sibling:", destination)
}
_, err := inst.MoveBelow(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case registerCliCommand("move-equivalent", "Classic file:pos relocation", `Moves a slave beneath another server, based on previously recorded "equivalence coordinates"`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
_, err := inst.MoveEquivalent(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case registerCliCommand("repoint", "Classic file:pos relocation", `Make the given instance replicate from another instance without changing the binglog coordinates. Use with care`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
// destinationKey can be null, in which case the instance repoints to its existing master
instance, err := inst.Repoint(instanceKey, destinationKey, inst.GTIDHintNeutral)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case registerCliCommand("repoint-slaves", "Classic file:pos relocation", `Repoint all slaves of given instance to replicate back from the instance. Use with care`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
repointedSlaves, err, errs := inst.RepointSlavesTo(instanceKey, pattern, destinationKey)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range repointedSlaves {
fmt.Println(fmt.Sprintf("%s<%s", slave.Key.DisplayString(), instanceKey.DisplayString()))
}
}
}
case registerCliCommand("enslave-siblings", "Classic file:pos relocation", `Turn all siblings of a slave into its sub-slaves.`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, _, err := inst.EnslaveSiblings(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("enslave-master", "Classic file:pos relocation", `Turn an instance into a master of its own master; essentially switch the two.`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.EnslaveMaster(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("make-co-master", "Classic file:pos relocation", `Create a master-master replication. Given instance is a slave which replicates directly from a master.`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.MakeCoMaster(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("get-candidate-slave", "Classic file:pos relocation", `Information command suggesting the most up-to-date slave of a given instance that is good for promotion`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
instance, _, _, _, err := inst.GetCandidateSlave(instanceKey, false)
if err != nil {
log.Fatale(err)
} else {
fmt.Println(instance.Key.DisplayString())
}
}
case registerCliCommand("regroup-slaves-bls", "Binlog server relocation", `Regroup Binlog Server slaves of a given instance`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, promotedBinlogServer, err := inst.RegroupSlavesBinlogServers(instanceKey, false)
if promotedBinlogServer == nil {
log.Fatalf("Could not regroup binlog server slaves of %+v; error: %+v", *instanceKey, err)
}
fmt.Println(promotedBinlogServer.Key.DisplayString())
if err != nil {
log.Fatale(err)
}
}
// move, GTID
case registerCliCommand("move-gtid", "GTID relocation", `Move a slave beneath another instance.`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
_, err := inst.MoveBelowGTID(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case registerCliCommand("move-slaves-gtid", "GTID relocation", `Moves all slaves of a given instance under another (destination) instance using GTID`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
movedSlaves, _, err, errs := inst.MoveSlavesGTID(instanceKey, destinationKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range movedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case registerCliCommand("regroup-slaves-gtid", "GTID relocation", `Given an instance, pick one of its slave and make it local master of its siblings, using GTID.`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
lostSlaves, movedSlaves, promotedSlave, err := inst.RegroupSlavesGTID(instanceKey, false, func(candidateSlave *inst.Instance) { fmt.Println(candidateSlave.Key.DisplayString()) })
if promotedSlave == nil {
log.Fatalf("Could not regroup slaves of %+v; error: %+v", *instanceKey, err)
}
fmt.Println(fmt.Sprintf("%s lost: %d, moved: %d",
promotedSlave.Key.DisplayString(), len(lostSlaves), len(movedSlaves)))
if err != nil {
log.Fatale(err)
}
}
// Pseudo-GTID
case registerCliCommand("match", "Pseudo-GTID relocation", `Matches a slave beneath another (destination) instance using Pseudo-GTID`),
registerCliCommand("match-below", "Pseudo-GTID relocation", `Synonym to 'match', will be deprecated`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
_, _, err := inst.MatchBelow(instanceKey, destinationKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case registerCliCommand("match-up", "Pseudo-GTID relocation", `Transport the slave one level up the hierarchy, making it child of its grandparent, using Pseudo-GTID`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
instance, _, err := inst.MatchUp(instanceKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case registerCliCommand("rematch", "Pseudo-GTID relocation", `Reconnect a slave onto its master, via PSeudo-GTID.`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
instance, _, err := inst.RematchSlave(instanceKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case registerCliCommand("match-slaves", "Pseudo-GTID relocation", `Matches all slaves of a given instance under another (destination) instance using Pseudo-GTID`),
registerCliCommand("multi-match-slaves", "Pseudo-GTID relocation", `Synonym to 'match-slaves', will be deprecated`):
{
// Move all slaves of "instance" beneath "destination"
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
matchedSlaves, _, err, errs := inst.MultiMatchSlaves(instanceKey, destinationKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range matchedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case registerCliCommand("match-up-slaves", "Pseudo-GTID relocation", `Matches slaves of the given instance one level up the topology, making them siblings of given instance, using Pseudo-GTID`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
matchedSlaves, _, err, errs := inst.MatchUpSlaves(instanceKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range matchedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case registerCliCommand("regroup-slaves-pgtid", "Pseudo-GTID relocation", `Given an instance, pick one of its slave and make it local master of its siblings, using Pseudo-GTID.`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
lostSlaves, equalSlaves, aheadSlaves, promotedSlave, err := inst.RegroupSlavesPseudoGTID(instanceKey, false, func(candidateSlave *inst.Instance) { fmt.Println(candidateSlave.Key.DisplayString()) }, postponedFunctionsContainer)
postponedFunctionsContainer.InvokePostponed()
if promotedSlave == nil {
log.Fatalf("Could not regroup slaves of %+v; error: %+v", *instanceKey, err)
}
fmt.Println(fmt.Sprintf("%s lost: %d, trivial: %d, pseudo-gtid: %d",
promotedSlave.Key.DisplayString(), len(lostSlaves), len(equalSlaves), len(aheadSlaves)))
if err != nil {
log.Fatale(err)
}
}
// General replication commands
case registerCliCommand("enable-gtid", "Replication, general", `If possible, turn on GTID replication`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.EnableGTID(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("disable-gtid", "Replication, general", `Turn off GTID replication, back to file:pos replication`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.DisableGTID(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("reset-master-gtid-remove-own-uuid", "Replication, general", `Reset master on instance, remove GTID entries generated by instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.ResetMasterGTIDOperation(instanceKey, true, "")
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("skip-query", "Replication, general", `Skip a single statement on a slave; either when running with GTID or without`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.SkipQuery(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("stop-slave", "Replication, general", `Issue a STOP SLAVE on an instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.StopSlave(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("start-slave", "Replication, general", `Issue a START SLAVE on an instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.StartSlave(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("restart-slave", "Replication, general", `STOP and START SLAVE on an instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.RestartSlave(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("reset-slave", "Replication, general", `Issues a RESET SLAVE command; use with care`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.ResetSlaveOperation(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("detach-slave", "Replication, general", `Stops replication and modifies binlog position into an impossible, yet reversible, value.`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.DetachSlaveOperation(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("reattach-slave", "Replication, general", `Undo a detach-slave operation`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.ReattachSlaveOperation(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("detach-slave-master-host", "Replication, general", `Stops replication and modifies Master_Host into an impossible, yet reversible, value.`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.DetachSlaveMasterHost(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("reattach-slave-master-host", "Replication, general", `Undo a detach-slave-master-host operation`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.ReattachSlaveMasterHost(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("master-pos-wait", "Replication, general", `Wait until slave reaches given replication coordinates (--binlog=file:pos)`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unresolved instance")
}
instance, err := inst.ReadTopologyInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
var binlogCoordinates *inst.BinlogCoordinates
if binlogCoordinates, err = inst.ParseBinlogCoordinates(*config.RuntimeCLIFlags.BinlogFile); err != nil {
log.Fatalf("Expecing --binlog argument as file:pos")
}
_, err = inst.MasterPosWait(instanceKey, binlogCoordinates)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
// Pool
case registerCliCommand("set-read-only", "Instance", `Turn an instance read-only, via SET GLOBAL read_only := 1`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.SetReadOnly(instanceKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("set-writeable", "Instance", `Turn an instance writeable, via SET GLOBAL read_only := 0`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
_, err := inst.SetReadOnly(instanceKey, false)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
// Binary log operations
case registerCliCommand("flush-binary-logs", "Binary logs", `Flush binary logs on an instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
var err error
if *config.RuntimeCLIFlags.BinlogFile == "" {
_, err = inst.FlushBinaryLogs(instanceKey, 1)
} else {
_, err = inst.FlushBinaryLogsTo(instanceKey, *config.RuntimeCLIFlags.BinlogFile)
}
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("purge-binary-logs", "Binary logs", `Purge binary logs of an instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
var err error
if *config.RuntimeCLIFlags.BinlogFile == "" {
log.Fatal("expecting --binlog value")
}
_, err = inst.PurgeBinaryLogsTo(instanceKey, *config.RuntimeCLIFlags.BinlogFile)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("last-pseudo-gtid", "Binary logs", `Find latest Pseudo-GTID entry in instance's binary logs`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unresolved instance")
}
instance, err := inst.ReadTopologyInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
coordinates, text, err := inst.FindLastPseudoGTIDEntry(instance, instance.RelaylogCoordinates, nil, strict, nil)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%+v:%s", *coordinates, text))
}
case registerCliCommand("find-binlog-entry", "Binary logs", `Get binlog file:pos of entry given by --pattern (exact full match, not a regular expression) in a given instance`):
{
if pattern == "" {
log.Fatal("No pattern given")
}
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unresolved instance")
}
instance, err := inst.ReadTopologyInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
coordinates, err := inst.SearchEntryInInstanceBinlogs(instance, pattern, false)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%+v", *coordinates))
}
case registerCliCommand("correlate-binlog-pos", "Binary logs", `Given an instance (-i) and binlog coordinates (--binlog=file:pos), find the correlated coordinates in another instance (-d)`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unresolved instance")
}
instance, err := inst.ReadTopologyInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
if !instance.LogBinEnabled {
log.Fatalf("Instance does not have binary logs: %+v", *instanceKey)
}
if destinationKey == nil {
log.Fatal("Cannot deduce target instance:", destination)
}
otherInstance, err := inst.ReadTopologyInstance(destinationKey)
if err != nil {
log.Fatale(err)
}
if otherInstance == nil {
log.Fatalf("Instance not found: %+v", *destinationKey)
}
var binlogCoordinates *inst.BinlogCoordinates
if *config.RuntimeCLIFlags.BinlogFile == "" {
binlogCoordinates = &instance.SelfBinlogCoordinates
} else {
if binlogCoordinates, err = inst.ParseBinlogCoordinates(*config.RuntimeCLIFlags.BinlogFile); err != nil {
log.Fatalf("Expecing --binlog argument as file:pos")
}
}
coordinates, _, err := inst.CorrelateBinlogCoordinates(instance, binlogCoordinates, otherInstance)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%+v", *coordinates))
}
// Pool
case registerCliCommand("submit-pool-instances", "Pools", `Submit a pool name with a list of instances in that pool`):
{
if pool == "" {
log.Fatal("Please submit --pool")
}
err := inst.ApplyPoolInstances(pool, instance)
if err != nil {
log.Fatale(err)
}
}
case registerCliCommand("cluster-pool-instances", "Pools", `List all pools and their associated instances`):
{
clusterPoolInstances, err := inst.ReadAllClusterPoolInstances()
if err != nil {
log.Fatale(err)
}
for _, clusterPoolInstance := range clusterPoolInstances {
fmt.Println(fmt.Sprintf("%s\t%s\t%s\t%s:%d", clusterPoolInstance.ClusterName, clusterPoolInstance.ClusterAlias, clusterPoolInstance.Pool, clusterPoolInstance.Hostname, clusterPoolInstance.Port))
}
}
// Information
case registerCliCommand("find", "Information", `Find instances whose hostname matches given regex pattern`):
{
if pattern == "" {
log.Fatal("No pattern given")
}
instances, err := inst.FindInstances(pattern)
if err != nil {
log.Fatale(err)
} else {
for _, instance := range instances {
fmt.Println(instance.Key.DisplayString())
}
}
}
case registerCliCommand("clusters", "Information", `List all clusters known to orchestrator`):
{
clusters, err := inst.ReadClusters()
if err != nil {
log.Fatale(err)
} else {
fmt.Println(strings.Join(clusters, "\n"))
}
}
case registerCliCommand("topology", "Information", `Show an ascii-graph of a replication topology, given a member of that topology`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
output, err := inst.ASCIITopology(instanceKey, pattern)
if err != nil {
log.Fatale(err)
}
fmt.Println(output)
}
case registerCliCommand("which-instance", "Information", `Output the fully-qualified hostname:port representation of the given instance, or error if unknown`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unable to get master: unresolved instance")
}
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
fmt.Println(instance.Key.DisplayString())
}
case registerCliCommand("which-cluster", "Information", `Output the name of the cluster an instance belongs to, or error if unknown to orchestrator`):
{
clusterName := getClusterName(clusterAlias, instanceKey)
fmt.Println(clusterName)
}
case registerCliCommand("which-cluster-instances", "Information", `Output the list of instances participating in same cluster as given instance`):
{
clusterName := getClusterName(clusterAlias, instanceKey)
instances, err := inst.ReadClusterInstances(clusterName)
if err != nil {
log.Fatale(err)
}
for _, clusterInstance := range instances {
fmt.Println(clusterInstance.Key.DisplayString())
}
}
case registerCliCommand("which-cluster-osc-slaves", "Information", `Output a list of slaves in same cluster as given instance, that could serve as a pt-online-schema-change operation control slaves`):
{
clusterName := getClusterName(clusterAlias, instanceKey)
instances, err := inst.GetClusterOSCSlaves(clusterName)
if err != nil {
log.Fatale(err)
}
for _, clusterInstance := range instances {
fmt.Println(clusterInstance.Key.DisplayString())
}
}
case registerCliCommand("which-master", "Information", `Output the fully-qualified hostname:port representation of a given instance's master`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unable to get master: unresolved instance")
}
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
fmt.Println(instance.MasterKey.DisplayString())
}
case registerCliCommand("which-slaves", "Information", `Output the fully-qualified hostname:port list of slaves of a given instance`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unable to get slaves: unresolved instance")
}
slaves, err := inst.ReadSlaveInstances(instanceKey)
if err != nil {
log.Fatale(err)
}
for _, slave := range slaves {
fmt.Println(slave.Key.DisplayString())
}
}
case registerCliCommand("instance-status", "Information", `Output short status on a given instance`):
{
if instanceKey == nil {
instanceKey = assignThisInstanceKey()
}
if instanceKey == nil {
log.Fatalf("Unable to get status: unresolved instance")
}
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
fmt.Println(instance.HumanReadableDescription())
}
case registerCliCommand("get-cluster-heuristic-lag", "Information", `For a given cluster (indicated by an instance or alias), output a heuristic "representative" lag of that cluster`):
{
clusterName := getClusterName(clusterAlias, instanceKey)
lag, err := inst.GetClusterHeuristicLag(clusterName)
if err != nil {
log.Fatale(err)
}
fmt.Println(lag)
}
// Instance management
case registerCliCommand("discover", "Instance management", `Lookup an instance, investigate it`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
instance, err := inst.ReadTopologyInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instance.Key.DisplayString())
}
case registerCliCommand("forget", "Instance management", `Forget about an instance's existence`):
{
if rawInstanceKey == nil {
rawInstanceKey = assignThisInstanceKey()
}
if rawInstanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.ForgetInstance(rawInstanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(rawInstanceKey.DisplayString())
}
case registerCliCommand("begin-maintenance", "Instance management", `Request a maintenance lock on an instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if reason == "" {
log.Fatal("--reason option required")
}
var durationSeconds int = 0
if duration != "" {
durationSeconds, err = util.SimpleTimeToSeconds(duration)
if err != nil {
log.Fatale(err)
}
if durationSeconds < 0 {
log.Fatalf("Duration value must be non-negative. Given value: %d", durationSeconds)
}
}
maintenanceKey, err := inst.BeginBoundedMaintenance(instanceKey, inst.GetMaintenanceOwner(), reason, uint(durationSeconds))
if err == nil {
log.Infof("Maintenance key: %+v", maintenanceKey)
log.Infof("Maintenance duration: %d seconds", durationSeconds)
}
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("end-maintenance", "Instance management", `Remove maintenance lock from an instance`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
err := inst.EndMaintenanceByInstanceKey(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("begin-downtime", "Instance management", `Mark an instance as downtimed`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
if reason == "" {
log.Fatal("--reason option required")
}
var durationSeconds int = 0
if duration != "" {
durationSeconds, err = util.SimpleTimeToSeconds(duration)
if err != nil {
log.Fatale(err)
}
if durationSeconds < 0 {
log.Fatalf("Duration value must be non-negative. Given value: %d", durationSeconds)
}
}
err := inst.BeginDowntime(instanceKey, inst.GetMaintenanceOwner(), reason, uint(durationSeconds))
if err == nil {
log.Infof("Downtime duration: %d seconds", durationSeconds)
} else {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("end-downtime", "Instance management", `Indicate an instance is no longer downtimed`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
err := inst.EndDowntime(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
// Recovery & analysis
case registerCliCommand("recover", "Recovery", `Do auto-recovery given a dead instance`), registerCliCommand("recover-lite", "Recovery", `Do auto-recovery given a dead instance. Orchestrator chooses the best course of actionwithout executing external processes`):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
recoveryAttempted, promotedInstanceKey, err := logic.CheckAndRecover(instanceKey, destinationKey, (command == "recover-lite"))
if err != nil {
log.Fatale(err)
}
if recoveryAttempted {
if promotedInstanceKey == nil {
log.Fatalf("Recovery attempted yet no slave promoted")
}
fmt.Println(promotedInstanceKey.DisplayString())
}
}
case registerCliCommand("replication-analysis", "Recovery", `Request an analysis of potential crash incidents in all known topologies`):
{
analysis, err := inst.GetReplicationAnalysis("", false, false)
if err != nil {
log.Fatale(err)
}
for _, entry := range analysis {
fmt.Println(fmt.Sprintf("%s (cluster %s): %s", entry.AnalyzedInstanceKey.DisplayString(), entry.ClusterDetails.ClusterName, entry.Analysis))
}
}
case registerCliCommand("ack-cluster-recoveries", "Recovery", `Acknowledge recoveries for a given cluster; this unblocks pending future recoveries`):
{
if reason == "" {
log.Fatal("--reason option required (comment your ack)")
}
clusterName := getClusterName(clusterAlias, instanceKey)
countRecoveries, err := logic.AcknowledgeClusterRecoveries(clusterName, inst.GetMaintenanceOwner(), reason)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%d recoveries acknowldged", countRecoveries))
}
case registerCliCommand("ack-instance-recoveries", "Recovery", `Acknowledge recoveries for a given instance; this unblocks pending future recoveries`):
{
if reason == "" {
log.Fatal("--reason option required (comment your ack)")
}
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
countRecoveries, err := logic.AcknowledgeInstanceRecoveries(instanceKey, inst.GetMaintenanceOwner(), reason)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%d recoveries acknowldged", countRecoveries))
}
// Instance meta
case registerCliCommand("register-candidate", "Instance, meta", `Indicate that a specific instance is a preferred candidate for master promotion`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
err := inst.RegisterCandidateInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("register-hostname-unresolve", "Instance, meta", `Assigns the given instance a virtual (aka "unresolved") name`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
err := inst.RegisterHostnameUnresolve(instanceKey, hostnameFlag)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case registerCliCommand("deregister-hostname-unresolve", "Instance, meta", `Explicitly deregister/dosassociate a hostname with an "unresolved" name`):
{
instanceKey = deduceInstanceKeyIfNeeded(instance, instanceKey)
err := inst.DeregisterHostnameUnresolve(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
// meta
case registerCliCommand("snapshot-topologies", "Meta", `Take a snapshot of existing topologies.`):
{
err := inst.SnapshotTopologies()
if err != nil {
log.Fatale(err)
}
}
case registerCliCommand("continuous", "Meta", `Enter continuous mode, and actively poll for instances, diagnose problems, do maintenance`):
{
logic.ContinuousDiscovery()
}
case registerCliCommand("resolve", "Meta", `Resolve given hostname`):
{
if rawInstanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if conn, err := net.Dial("tcp", rawInstanceKey.DisplayString()); err == nil {
log.Debugf("tcp test is good; got connection %+v", conn)
conn.Close()
} else {
log.Fatale(err)
}
if cname, err := inst.GetCNAME(rawInstanceKey.Hostname); err == nil {
log.Debugf("GetCNAME() %+v, %+v", cname, err)
rawInstanceKey.Hostname = cname
fmt.Println(rawInstanceKey.DisplayString())
} else {
log.Fatale(err)
}
}
case registerCliCommand("reset-hostname-resolve-cache", "Meta", `Clear the hostname resolve cache`):
{
err := inst.ResetHostnameResolveCache()
if err != nil {
log.Fatale(err)
}
fmt.Println("hostname resolve cache cleared")
}
case registerCliCommand("reset-internal-db-deployment", "Meta, internal", `Clear internal db deployment history, use if somehow corrupted internal deployment history`):
{
config.Config.SkipOrchestratorDatabaseUpdate = true
db.ResetInternalDeployment()
fmt.Println("Internal db deployment history reset. Next orchestrator execution will rebuild internal db structure (no data will be lost)")
}
// Help
case "help":
{
fmt.Fprintf(os.Stderr, availableCommandsUsage())
}
default:
log.Fatalf("Unknown command: \"%s\". %s", command, availableCommandsUsage())
}
}
// Cli initiates a command line interface, executing requested command.
func Cli(command string, strict bool, instance string, destination string, owner string, reason string, duration string, pattern string, clusterAlias string, pool string, hostnameFlag string) {
if instance != "" && !strings.Contains(instance, ":") {
instance = fmt.Sprintf("%s:%d", instance, config.Config.DefaultInstancePort)
}
instanceKey, err := inst.ParseInstanceKey(instance)
if err != nil {
instanceKey = nil
}
rawInstanceKey, err := inst.NewRawInstanceKey(instance)
if err != nil {
rawInstanceKey = nil
}
if destination != "" && !strings.Contains(destination, ":") {
destination = fmt.Sprintf("%s:%d", destination, config.Config.DefaultInstancePort)
}
destinationKey, err := inst.ParseInstanceKey(destination)
if err != nil {
destinationKey = nil
}
if hostname, err := os.Hostname(); err == nil {
thisInstanceKey = &inst.InstanceKey{Hostname: hostname, Port: int(config.Config.DefaultInstancePort)}
}
if len(owner) == 0 {
// get os username as owner
usr, err := user.Current()
if err != nil {
log.Fatale(err)
}
owner = usr.Username
}
inst.SetMaintenanceOwner(owner)
// begin commands
switch command {
// Instance meta
case cliCommand("discover"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
instance, err := inst.ReadTopologyInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instance.Key.DisplayString())
}
case cliCommand("forget"):
{
if rawInstanceKey == nil {
rawInstanceKey = thisInstanceKey
}
if rawInstanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.ForgetInstance(rawInstanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(rawInstanceKey.DisplayString())
}
case cliCommand("resolve"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if conn, err := net.Dial("tcp", instanceKey.DisplayString()); err == nil {
conn.Close()
} else {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("register-hostname-unresolve"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.RegisterHostnameUnresolve(instanceKey, hostnameFlag)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("deregister-hostname-unresolve"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.DeregisterHostnameUnresolve(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("register-candidate"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.RegisterCandidateInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
// Instance
case cliCommand("begin-maintenance"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if reason == "" {
log.Fatal("--reason option required")
}
var durationSeconds int = 0
if duration != "" {
durationSeconds, err = util.SimpleTimeToSeconds(duration)
if err != nil {
log.Fatale(err)
}
if durationSeconds < 0 {
log.Fatalf("Duration value must be non-negative. Given value: %d", durationSeconds)
}
}
maintenanceKey, err := inst.BeginBoundedMaintenance(instanceKey, inst.GetMaintenanceOwner(), reason, uint(durationSeconds))
if err == nil {
log.Infof("Maintenance key: %+v", maintenanceKey)
log.Infof("Maintenance duration: %d seconds", durationSeconds)
}
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("end-maintenance"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.EndMaintenanceByInstanceKey(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("begin-downtime"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if reason == "" {
log.Fatal("--reason option required")
}
var durationSeconds int = 0
if duration != "" {
durationSeconds, err = util.SimpleTimeToSeconds(duration)
if err != nil {
log.Fatale(err)
}
if durationSeconds < 0 {
log.Fatalf("Duration value must be non-negative. Given value: %d", durationSeconds)
}
}
err := inst.BeginDowntime(instanceKey, inst.GetMaintenanceOwner(), reason, uint(durationSeconds))
if err == nil {
log.Infof("Downtime duration: %d seconds", durationSeconds)
} else {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("end-downtime"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.EndDowntime(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("set-read-only"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.SetReadOnly(instanceKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("set-writeable"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.SetReadOnly(instanceKey, false)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("flush-binary-logs"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
var err error
if *config.RuntimeCLIFlags.BinlogFile == "" {
err = inst.FlushBinaryLogs(instanceKey, 1)
} else {
_, err = inst.FlushBinaryLogsTo(instanceKey, *config.RuntimeCLIFlags.BinlogFile)
}
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("last-pseudo-gtid"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatalf("Unresolved instance")
}
instance, err := inst.ReadTopologyInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
coordinates, text, err := inst.FindLastPseudoGTIDEntry(instance, instance.RelaylogCoordinates, strict, nil)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%+v:%s", *coordinates, text))
}
// replication
case cliCommand("stop-slave"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.StopSlave(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("start-slave"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.StartSlave(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("restart-slave"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.RestartSlave(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("reset-slave"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.ResetSlaveOperation(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("detach-slave"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.DetachSlaveOperation(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("reattach-slave"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.ReattachSlaveOperation(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("enable-gtid"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.EnableGTID(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("disable-gtid"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.DisableGTID(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("skip-query"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.SkipQuery(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
// move
case cliCommand("relocate"), cliCommand("relocate-below"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
_, err := inst.RelocateBelow(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case cliCommand("relocate-slaves"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
slaves, _, err, errs := inst.RelocateSlaves(instanceKey, destinationKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range slaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case cliCommand("move-up"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
instance, err := inst.MoveUp(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case cliCommand("move-up-slaves"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
movedSlaves, _, err, errs := inst.MoveUpSlaves(instanceKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range movedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case cliCommand("move-below"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce sibling:", destination)
}
_, err := inst.MoveBelow(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case cliCommand("move-equivalent"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce sibling:", destination)
}
_, err := inst.MoveEquivalent(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case cliCommand("move-gtid"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce sibling:", destination)
}
_, err := inst.MoveBelowGTID(instanceKey, destinationKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case cliCommand("move-slaves-gtid"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
movedSlaves, _, err, errs := inst.MoveSlavesGTID(instanceKey, destinationKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range movedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case cliCommand("repoint"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
// destinationKey can be null, in which case the instance repoints to its existing master
instance, err := inst.Repoint(instanceKey, destinationKey, inst.GTIDHintNeutral)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case cliCommand("repoint-slaves"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
repointedSlaves, err, errs := inst.RepointSlavesTo(instanceKey, pattern, destinationKey)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range repointedSlaves {
fmt.Println(fmt.Sprintf("%s<%s", slave.Key.DisplayString(), instanceKey.DisplayString()))
}
}
}
case cliCommand("enslave-siblings"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, _, err := inst.EnslaveSiblings(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("enslave-master"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.EnslaveMaster(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
case cliCommand("make-co-master"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.MakeCoMaster(instanceKey)
if err != nil {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
// Pseudo-GTID
case cliCommand("match"), cliCommand("match-below"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
_, _, err := inst.MatchBelow(instanceKey, destinationKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), destinationKey.DisplayString()))
}
case cliCommand("match-up"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
instance, _, err := inst.MatchUp(instanceKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case cliCommand("rematch"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
instance, _, err := inst.RematchSlave(instanceKey, true)
if err != nil {
log.Fatale(err)
}
fmt.Println(fmt.Sprintf("%s<%s", instanceKey.DisplayString(), instance.MasterKey.DisplayString()))
}
case cliCommand("get-candidate-slave"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
instance, _, _, _, err := inst.GetCandidateSlave(instanceKey, false)
if err != nil {
log.Fatale(err)
} else {
fmt.Println(instance.Key.DisplayString())
}
}
case cliCommand("match-slaves"), cliCommand("multi-match-slaves"):
{
// Move all slaves of "instance" beneath "destination"
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if destinationKey == nil {
log.Fatal("Cannot deduce destination:", destination)
}
matchedSlaves, _, err, errs := inst.MultiMatchSlaves(instanceKey, destinationKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range matchedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case cliCommand("match-up-slaves"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
matchedSlaves, _, err, errs := inst.MatchUpSlaves(instanceKey, pattern)
if err != nil {
log.Fatale(err)
} else {
for _, e := range errs {
log.Errore(e)
}
for _, slave := range matchedSlaves {
fmt.Println(slave.Key.DisplayString())
}
}
}
case cliCommand("regroup-slaves"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
lostSlaves, equalSlaves, aheadSlaves, promotedSlave, err := inst.RegroupSlaves(instanceKey, false, func(candidateSlave *inst.Instance) { fmt.Println(candidateSlave.Key.DisplayString()) })
if promotedSlave == nil {
log.Fatalf("Could not regroup slaves of %+v; error: %+v", *instanceKey, err)
}
fmt.Println(fmt.Sprintf("%s lost: %d, trivial: %d, pseudo-gtid: %d",
promotedSlave.Key.DisplayString(), len(lostSlaves), len(equalSlaves), len(aheadSlaves)))
if err != nil {
log.Fatale(err)
}
}
case cliCommand("regroup-slaves-gtid"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
lostSlaves, movedSlaves, promotedSlave, err := inst.RegroupSlavesGTID(instanceKey, false, func(candidateSlave *inst.Instance) { fmt.Println(candidateSlave.Key.DisplayString()) })
if promotedSlave == nil {
log.Fatalf("Could not regroup slaves of %+v; error: %+v", *instanceKey, err)
}
fmt.Println(fmt.Sprintf("%s lost: %d, moved: %d",
promotedSlave.Key.DisplayString(), len(lostSlaves), len(movedSlaves)))
if err != nil {
log.Fatale(err)
}
}
case cliCommand("regroup-slaves-bls"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
promotedBinlogServer, err := inst.RegroupSlavesBinlogServers(instanceKey, false, nil)
if promotedBinlogServer == nil {
log.Fatalf("Could not regroup binlog server slaves of %+v; error: %+v", *instanceKey, err)
}
fmt.Println(promotedBinlogServer.Key.DisplayString())
if err != nil {
log.Fatale(err)
}
}
// cluster
case cliCommand("clusters"):
{
clusters, err := inst.ReadClusters()
if err != nil {
log.Fatale(err)
} else {
fmt.Println(strings.Join(clusters, "\n"))
}
}
case cliCommand("find"):
{
if pattern == "" {
log.Fatal("No pattern given")
}
instances, err := inst.FindInstances(pattern)
if err != nil {
log.Fatale(err)
} else {
for _, instance := range instances {
fmt.Println(instance.Key.DisplayString())
}
}
}
case cliCommand("topology"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
output, err := inst.ASCIITopology(instanceKey, pattern)
if err != nil {
log.Fatale(err)
}
fmt.Println(output)
}
case cliCommand("which-instance"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatalf("Unable to get master: unresolved instance")
}
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
fmt.Println(instance.Key.DisplayString())
}
case cliCommand("which-master"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatalf("Unable to get master: unresolved instance")
}
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
fmt.Println(instance.MasterKey.DisplayString())
}
case cliCommand("which-cluster"):
{
clusterName := getClusterName(clusterAlias, instanceKey)
fmt.Println(clusterName)
}
case cliCommand("which-cluster-instances"):
{
clusterName := getClusterName(clusterAlias, instanceKey)
instances, err := inst.ReadClusterInstances(clusterName)
if err != nil {
log.Fatale(err)
}
for _, clusterInstance := range instances {
fmt.Println(clusterInstance.Key.DisplayString())
}
}
case cliCommand("which-cluster-osc-slaves"):
{
clusterName := getClusterName(clusterAlias, instanceKey)
instances, err := inst.GetClusterOSCSlaves(clusterName)
if err != nil {
log.Fatale(err)
}
for _, clusterInstance := range instances {
fmt.Println(clusterInstance.Key.DisplayString())
}
}
case cliCommand("which-slaves"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatalf("Unable to get slaves: unresolved instance")
}
slaves, err := inst.ReadSlaveInstances(instanceKey)
if err != nil {
log.Fatale(err)
}
for _, slave := range slaves {
fmt.Println(slave.Key.DisplayString())
}
}
case cliCommand("instance-status"):
{
if instanceKey == nil {
instanceKey = thisInstanceKey
}
if instanceKey == nil {
log.Fatalf("Unable to get status: unresolved instance")
}
instance, _, err := inst.ReadInstance(instanceKey)
if err != nil {
log.Fatale(err)
}
if instance == nil {
log.Fatalf("Instance not found: %+v", *instanceKey)
}
fmt.Println(instance.HumanReadableDescription())
}
case cliCommand("get-cluster-heuristic-lag"):
{
clusterName := getClusterName(clusterAlias, instanceKey)
lag, err := inst.GetClusterHeuristicLag(clusterName)
if err != nil {
log.Fatale(err)
}
fmt.Println(lag)
}
// meta
case cliCommand("snapshot-topologies"):
{
err := inst.SnapshotTopologies()
if err != nil {
log.Fatale(err)
}
}
case cliCommand("continuous"):
{
logic.ContinuousDiscovery()
}
case cliCommand("reset-hostname-resolve-cache"):
{
err := inst.ResetHostnameResolveCache()
if err != nil {
log.Fatale(err)
}
fmt.Println("hostname resolve cache cleared")
}
// Recovery & analysis
case cliCommand("recover"), cliCommand("recover-lite"):
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
actionTaken, promotedInstance, err := logic.CheckAndRecover(instanceKey, destinationKey, true, (command == "recover-lite"))
if err != nil {
log.Fatale(err)
}
if actionTaken {
fmt.Println(promotedInstance.Key.DisplayString())
}
}
case cliCommand("replication-analysis"):
{
analysis, err := inst.GetReplicationAnalysis(false)
if err != nil {
log.Fatale(err)
}
for _, entry := range analysis {
fmt.Println(fmt.Sprintf("%s (cluster %s): %s", entry.AnalyzedInstanceKey.DisplayString(), entry.ClusterDetails.ClusterName, entry.Analysis))
}
}
// pool
case cliCommand("submit-pool-instances"):
{
if pool == "" {
log.Fatal("Please submit --pool")
}
err := inst.ApplyPoolInstances(pool, instance)
if err != nil {
log.Fatale(err)
}
}
case cliCommand("cluster-pool-instances"):
{
clusterPoolInstances, err := inst.ReadAllClusterPoolInstances()
if err != nil {
log.Fatale(err)
}
for _, clusterPoolInstance := range clusterPoolInstances {
fmt.Println(fmt.Sprintf("%s\t%s\t%s\t%s:%d", clusterPoolInstance.ClusterName, clusterPoolInstance.ClusterAlias, clusterPoolInstance.Pool, clusterPoolInstance.Hostname, clusterPoolInstance.Port))
}
}
default:
log.Fatalf("Unknown command: \"%s\". Available commands (-c):\n\t%v", command, strings.Join(knownCommands, "\n\t"))
}
}
// RecoverDeadCoMaster recovers a dead co-master, complete logic inside
func RecoverDeadCoMaster(topologyRecovery *TopologyRecovery, skipProcesses bool) (promotedSlave *inst.Instance, lostSlaves [](*inst.Instance), err error) {
analysisEntry := &topologyRecovery.AnalysisEntry
failedInstanceKey := &analysisEntry.AnalyzedInstanceKey
otherCoMasterKey := &analysisEntry.AnalyzedInstanceMasterKey
otherCoMaster, found, _ := inst.ReadInstance(otherCoMasterKey)
if otherCoMaster == nil || !found {
return nil, lostSlaves, topologyRecovery.AddError(log.Errorf("RecoverDeadCoMaster: could not read info for co-master %+v of %+v", *otherCoMasterKey, *failedInstanceKey))
}
inst.AuditOperation("recover-dead-co-master", failedInstanceKey, "problem found; will recover")
if !skipProcesses {
if err := executeProcesses(config.Config.PreFailoverProcesses, "PreFailoverProcesses", topologyRecovery, true); err != nil {
return nil, lostSlaves, topologyRecovery.AddError(err)
}
}
log.Debugf("topology_recovery: RecoverDeadCoMaster: will recover %+v", *failedInstanceKey)
var coMasterRecoveryType MasterRecoveryType = MasterRecoveryPseudoGTID
if analysisEntry.OracleGTIDImmediateTopology || analysisEntry.MariaDBGTIDImmediateTopology {
coMasterRecoveryType = MasterRecoveryGTID
}
log.Debugf("topology_recovery: RecoverDeadCoMaster: coMasterRecoveryType=%+v", coMasterRecoveryType)
switch coMasterRecoveryType {
case MasterRecoveryGTID:
{
lostSlaves, _, promotedSlave, err = inst.RegroupSlavesGTID(failedInstanceKey, true, nil)
}
case MasterRecoveryPseudoGTID:
{
lostSlaves, _, _, promotedSlave, err = inst.RegroupSlavesPseudoGTIDIncludingSubSlavesOfBinlogServers(failedInstanceKey, true, nil, &topologyRecovery.PostponedFunctionsContainer)
}
}
topologyRecovery.AddError(err)
mustPromoteOtherCoMaster := config.Config.CoMasterRecoveryMustPromoteOtherCoMaster
if !otherCoMaster.ReadOnly {
log.Debugf("topology_recovery: RecoverDeadCoMaster: other co-master %+v is writeable hence has to be promoted", otherCoMaster.Key)
mustPromoteOtherCoMaster = true
}
log.Debugf("topology_recovery: RecoverDeadCoMaster: mustPromoteOtherCoMaster? %+v", mustPromoteOtherCoMaster)
if promotedSlave != nil {
topologyRecovery.ParticipatingInstanceKeys.AddKey(promotedSlave.Key)
if mustPromoteOtherCoMaster {
log.Debugf("topology_recovery: mustPromoteOtherCoMaster. Verifying that %+v is/can be promoted", *otherCoMasterKey)
promotedSlave, err = replacePromotedSlaveWithCandidate(failedInstanceKey, promotedSlave, otherCoMasterKey)
} else {
// We are allowed to promote any server
promotedSlave, err = replacePromotedSlaveWithCandidate(failedInstanceKey, promotedSlave, nil)
if promotedSlave.DataCenter == otherCoMaster.DataCenter &&
promotedSlave.PhysicalEnvironment == otherCoMaster.PhysicalEnvironment && false {
// and _still_ we prefer to promote the co-master! They're in same env & DC so no worries about geo issues!
promotedSlave, err = replacePromotedSlaveWithCandidate(failedInstanceKey, promotedSlave, otherCoMasterKey)
}
}
topologyRecovery.AddError(err)
}
if promotedSlave != nil {
if mustPromoteOtherCoMaster && !promotedSlave.Key.Equals(otherCoMasterKey) {
topologyRecovery.AddError(log.Errorf("RecoverDeadCoMaster: could not manage to promote other-co-master %+v; was only able to promote %+v; CoMasterRecoveryMustPromoteOtherCoMaster is true, therefore failing", *otherCoMasterKey, promotedSlave.Key))
promotedSlave = nil
}
}
if promotedSlave != nil {
topologyRecovery.ParticipatingInstanceKeys.AddKey(promotedSlave.Key)
}
// OK, we may have someone promoted. Either this was the other co-master or another slave.
// Noting down that we DO NOT attempt to set a new co-master topology. We are good with remaining with a single master.
// I tried solving the "let's promote a slave and create a new co-master setup" but this turns so complex due to various factors.
// I see this as risky and not worth the questionable benefit.
// Maybe future me is a smarter person and finds a simple solution. Unlikely. I'm getting dumber.
//
// ...
// Now that we're convinved, take a look at what we can be left with:
// Say we started with M1<->M2<-S1, with M2 failing, and we promoted S1.
// We now have M1->S1 (because S1 is promoted), S1->M2 (because that's what it remembers), M2->M1 (because that's what it remembers)
// !! This is an evil 3-node circle that must be broken.
// config.Config.ApplyMySQLPromotionAfterMasterFailover, if true, will cause it to break, because we would RESET SLAVE on S1
// but we want to make sure the circle is broken no matter what.
// So in the case we promoted not-the-other-co-master, we issue a detach-slave-master-host, which is a reversible operation
if promotedSlave != nil && !promotedSlave.Key.Equals(otherCoMasterKey) {
_, err = inst.DetachSlaveMasterHost(&promotedSlave.Key)
topologyRecovery.AddError(log.Errore(err))
}
if promotedSlave != nil && len(lostSlaves) > 0 && config.Config.DetachLostSlavesAfterMasterFailover {
postponedFunction := func() error {
log.Debugf("topology_recovery: - RecoverDeadCoMaster: lost %+v slaves during recovery process; detaching them", len(lostSlaves))
for _, slave := range lostSlaves {
slave := slave
inst.DetachSlaveOperation(&slave.Key)
}
return nil
}
topologyRecovery.AddPostponedFunction(postponedFunction)
}
if config.Config.MasterFailoverLostInstancesDowntimeMinutes > 0 {
postponedFunction := func() error {
inst.BeginDowntime(failedInstanceKey, inst.GetMaintenanceOwner(), "RecoverDeadCoMaster indicates this instance is lost", config.Config.MasterFailoverLostInstancesDowntimeMinutes*60)
for _, slave := range lostSlaves {
slave := slave
inst.BeginDowntime(&slave.Key, inst.GetMaintenanceOwner(), "RecoverDeadCoMaster indicates this instance is lost", config.Config.MasterFailoverLostInstancesDowntimeMinutes*60)
}
return nil
}
topologyRecovery.AddPostponedFunction(postponedFunction)
}
return promotedSlave, lostSlaves, err
}
// RecoverDeadIntermediateMaster performs intermediate master recovery; complete logic inside
func RecoverDeadIntermediateMaster(topologyRecovery *TopologyRecovery, skipProcesses bool) (successorInstance *inst.Instance, err error) {
analysisEntry := &topologyRecovery.AnalysisEntry
failedInstanceKey := &analysisEntry.AnalyzedInstanceKey
recoveryResolved := false
inst.AuditOperation("recover-dead-intermediate-master", failedInstanceKey, "problem found; will recover")
if !skipProcesses {
if err := executeProcesses(config.Config.PreFailoverProcesses, "PreFailoverProcesses", topologyRecovery, true); err != nil {
return nil, topologyRecovery.AddError(err)
}
}
intermediateMasterInstance, _, err := inst.ReadInstance(failedInstanceKey)
if err != nil {
return nil, topologyRecovery.AddError(err)
}
// Find possible candidate
candidateSiblingOfIntermediateMaster, err := GetCandidateSiblingOfIntermediateMaster(intermediateMasterInstance)
relocateSlavesToCandidateSibling := func() {
if candidateSiblingOfIntermediateMaster == nil {
return
}
// We have a candidate
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will attempt a candidate intermediate master: %+v", candidateSiblingOfIntermediateMaster.Key)
relocatedSlaves, candidateSibling, err, errs := inst.RelocateSlaves(failedInstanceKey, &candidateSiblingOfIntermediateMaster.Key, "")
topologyRecovery.AddErrors(errs)
topologyRecovery.ParticipatingInstanceKeys.AddKey(candidateSiblingOfIntermediateMaster.Key)
if len(relocatedSlaves) == 0 {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: failed to move any slave to candidate intermediate master (%+v)", candidateSibling.Key)
return
}
if err != nil || len(errs) > 0 {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: move to candidate intermediate master (%+v) did not complete: %+v", candidateSibling.Key, err)
return
}
if err == nil {
recoveryResolved = true
successorInstance = candidateSibling
inst.AuditOperation("recover-dead-intermediate-master", failedInstanceKey, fmt.Sprintf("Relocated %d slaves under candidate sibling: %+v; %d errors: %+v", len(relocatedSlaves), candidateSibling.Key, len(errs), errs))
}
}
// Plan A: find a replacement intermediate master in same Data Center
if candidateSiblingOfIntermediateMaster != nil && candidateSiblingOfIntermediateMaster.DataCenter == intermediateMasterInstance.DataCenter {
relocateSlavesToCandidateSibling()
}
if !recoveryResolved {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will next attempt regrouping of slaves")
// Plan B: regroup (we wish to reduce cross-DC replication streams)
_, _, _, regroupPromotedSlave, err := inst.RegroupSlaves(failedInstanceKey, true, nil, nil)
if err != nil {
topologyRecovery.AddError(err)
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: regroup failed on: %+v", err)
}
if regroupPromotedSlave != nil {
topologyRecovery.ParticipatingInstanceKeys.AddKey(regroupPromotedSlave.Key)
}
// Plan C: try replacement intermediate master in other DC...
if candidateSiblingOfIntermediateMaster != nil && candidateSiblingOfIntermediateMaster.DataCenter != intermediateMasterInstance.DataCenter {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will next attempt relocating to another DC server")
relocateSlavesToCandidateSibling()
}
}
if !recoveryResolved {
// Do we still have leftovers? Some slaves couldn't move? Couldn't regroup? Only left with regroup's resulting leader?
// nothing moved?
// We don't care much if regroup made it or not. We prefer that it made it, in whcih case we only need to relocate up
// one slave, but the operation is still valid if regroup partially/completely failed. We just promote anything
// not regrouped.
// So, match up all that's left, plan D
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will next attempt to relocate up from %+v", *failedInstanceKey)
var errs []error
var relocatedSlaves [](*inst.Instance)
relocatedSlaves, successorInstance, err, errs = inst.RelocateSlaves(failedInstanceKey, &analysisEntry.AnalyzedInstanceMasterKey, "")
topologyRecovery.AddErrors(errs)
topologyRecovery.ParticipatingInstanceKeys.AddKey(analysisEntry.AnalyzedInstanceMasterKey)
if len(relocatedSlaves) > 0 {
recoveryResolved = true
inst.AuditOperation("recover-dead-intermediate-master", failedInstanceKey, fmt.Sprintf("Relocated slaves under: %+v %d errors: %+v", successorInstance.Key, len(errs), errs))
} else {
err = log.Errorf("topology_recovery: RecoverDeadIntermediateMaster failed to match up any slave from %+v", *failedInstanceKey)
topologyRecovery.AddError(err)
}
}
if !recoveryResolved {
successorInstance = nil
}
ResolveRecovery(topologyRecovery, successorInstance)
return successorInstance, err
}
// discoverInstance will attempt discovering an instance (unless it is already up to date) and will
// list down its master and slaves (if any) for further discovery.
func discoverInstance(instanceKey inst.InstanceKey) {
instanceKey.Formalize()
if !instanceKey.IsValid() {
return
}
instance, found, err := inst.ReadInstance(&instanceKey)
if found && instance.IsUpToDate && instance.IsLastCheckValid {
// we've already discovered this one. Skip!
goto Cleanup
}
discoveriesCounter.Inc(1)
// First we've ever heard of this instance. Continue investigation:
instance, err = inst.ReadTopologyInstance(&instanceKey)
// panic can occur (IO stuff). Therefore it may happen
// that instance is nil. Check it.
if err != nil || instance == nil {
failedDiscoveriesCounter.Inc(1)
log.Warningf("instance is nil in discoverInstance. key=%+v, error=%+v", instanceKey, err)
goto Cleanup
}
log.Debugf("Discovered host: %+v, master: %+v", instance.Key, instance.MasterKey)
if !isElectedNode {
// Maybe this node was elected before, but isn't elected anymore.
// If not elected, stop drilling down to further investigate slaves.
return
}
// Investigate slaves:
for _, slaveKey := range instance.SlaveHosts.GetInstanceKeys() {
discoveryInstanceKeys <- slaveKey
}
// Investigate master:
discoveryInstanceKeys <- instance.MasterKey
Cleanup:
}
// Start discovery begins a one time asynchronuous discovery process for the given
// instance and all of its topology connected instances.
// That is, the instance will be investigated for master and slaves, and the routines will follow on
// each and every such found master/slave.
// In essense, assuming all slaves in a replication topology are running, and given a single instance
// in such topology, this function will detect the entire topology.
func StartDiscovery(instanceKey inst.InstanceKey) {
log.Infof("Starting discovery at %+v", instanceKey)
pendingTokens := make(chan bool, maxConcurrency)
completedTokens := make(chan bool, maxConcurrency)
accountedDiscoverInstance(instanceKey, pendingTokens, completedTokens)
go handleDiscoveryRequests(pendingTokens, completedTokens)
// Block until all are complete
for {
select {
case <-pendingTokens:
<-completedTokens
default:
inst.AuditOperation("start-discovery", &instanceKey, "")
return
}
}
}
func initGraphiteMetrics() error {
if config.Config.GraphiteAddr == "" {
return nil
}
if config.Config.GraphitePath == "" {
return log.Errorf("No graphite path provided (see GraphitePath config variable). Will not log to graphite")
}
addr, err := net.ResolveTCPAddr("tcp", config.Config.GraphiteAddr)
if err != nil {
return log.Errore(err)
}
graphitePathHostname := ThisHostname
if config.Config.GraphiteConvertHostnameDotsToUnderscores {
graphitePathHostname = strings.Replace(graphitePathHostname, ".", "_", -1)
}
graphitePath := config.Config.GraphitePath
graphitePath = strings.Replace(graphitePath, "{hostname}", graphitePathHostname, -1)
log.Debugf("Will log to graphite on %+v, %+v", config.Config.GraphiteAddr, graphitePath)
go graphite.Graphite(metrics.DefaultRegistry, 1*time.Minute, graphitePath, addr)
return nil
}
// ContinuousDiscovery starts an asynchronuous infinite discovery process where instances are
// periodically investigated and their status captured, and long since unseen instances are
// purged and forgotten.
func ContinuousDiscovery() {
log.Infof("Starting continuous discovery")
inst.LoadHostnameResolveCacheFromDatabase()
go handleDiscoveryRequests(nil, nil)
tick := time.Tick(time.Duration(config.Config.DiscoveryPollSeconds) * time.Second)
forgetUnseenTick := time.Tick(time.Minute)
recoverTick := time.Tick(10 * time.Second)
var snapshotTopologiesTick <-chan time.Time
if config.Config.SnapshotTopologiesIntervalHours > 0 {
snapshotTopologiesTick = time.Tick(time.Duration(config.Config.SnapshotTopologiesIntervalHours) * time.Hour)
}
go initGraphiteMetrics()
for {
select {
case <-tick:
go func() {
if isElectedNode, _ = attemptElection(); isElectedNode {
instanceKeys, _ := inst.ReadOutdatedInstanceKeys()
log.Debugf("outdated keys: %+v", instanceKeys)
for _, instanceKey := range instanceKeys {
discoveryInstanceKeys <- instanceKey
}
} else {
log.Debugf("Not elected as active node; polling")
}
discoveryQueueLengthGauge.Update(int64(len(discoveryInstanceKeys)))
}()
case <-forgetUnseenTick:
// See if we should also forget objects (lower frequency)
go func() {
if isElectedNode {
inst.ForgetLongUnseenInstances()
inst.ForgetUnseenInstancesDifferentlyResolved()
inst.ForgetExpiredHostnameResolves()
inst.DeleteInvalidHostnameResolves()
inst.ReviewUnseenInstances()
inst.InjectUnseenMasters()
inst.ResolveUnknownMasterHostnameResolves()
inst.ExpireMaintenance()
inst.ExpireDowntime()
inst.ExpireCandidateInstances()
inst.ExpireHostnameUnresolve()
inst.ExpireClusterDomainName()
inst.ExpireAudit()
inst.ExpireMasterPositionEquivalence()
}
if !isElectedNode {
// Take this opportunity to refresh yourself
inst.LoadHostnameResolveCacheFromDatabase()
}
inst.ReadClusterAliases()
HealthTest()
}()
case <-recoverTick:
go func() {
if isElectedNode {
ClearActiveFailureDetections()
ClearActiveRecoveries()
CheckAndRecover(nil, nil, false, false)
}
}()
case <-snapshotTopologiesTick:
go func() {
inst.SnapshotTopologies()
}()
}
}
}
func pollAgent(hostname string) error {
polledAgent, err := agent.GetAgent(hostname)
agent.UpdateAgentLastChecked(hostname)
if err != nil {
return log.Errore(err)
}
err = agent.UpdateAgentInfo(hostname, polledAgent)
if err != nil {
return log.Errore(err)
}
return nil
}
// ContinuousAgentsPoll starts an asynchronuous infinite process where agents are
// periodically investigated and their status captured, and long since unseen agents are
// purged and forgotten.
func ContinuousAgentsPoll() {
log.Infof("Starting continuous agents poll")
go discoverSeededAgents()
tick := time.Tick(time.Duration(config.Config.DiscoveryPollSeconds) * time.Second)
forgetUnseenTick := time.Tick(time.Hour)
for range tick {
agentsHosts, _ := agent.ReadOutdatedAgentsHosts()
log.Debugf("outdated agents hosts: %+v", agentsHosts)
for _, hostname := range agentsHosts {
go pollAgent(hostname)
}
// See if we should also forget agents (lower frequency)
select {
case <-forgetUnseenTick:
agent.ForgetLongUnseenAgents()
agent.FailStaleSeeds()
default:
}
}
}
func discoverSeededAgents() {
for seededAgent := range agent.SeededAgents {
instanceKey := inst.InstanceKey{Hostname: seededAgent.Hostname, Port: int(seededAgent.MySQLPort)}
go StartDiscovery(instanceKey)
}
}
// replacePromotedSlaveWithCandidate is called after an intermediate master has died and been replaced by some promotedSlave.
// But, is there an even better slave to promote?
// if candidateInstanceKey is given, then it is forced to be promoted over the promotedSlave
// Otherwise, search for the best to promote!
func replacePromotedSlaveWithCandidate(deadInstanceKey *inst.InstanceKey, promotedSlave *inst.Instance, candidateInstanceKey *inst.InstanceKey) (*inst.Instance, error) {
candidateSlaves, _ := inst.ReadClusterCandidateInstances(promotedSlave.ClusterName)
// So we've already promoted a slave.
// However, can we improve on our choice? Are there any slaves marked with "is_candidate"?
// Maybe we actually promoted such a slave. Does that mean we should keep it?
// The current logic is:
// - 1. we prefer to promote a "is_candidate" which is in the same DC & env as the dead intermediate master (or do nothing if the promtoed slave is such one)
// - 2. we prefer to promote a "is_candidate" which is in the same DC & env as the promoted slave (or do nothing if the promtoed slave is such one)
// - 3. keep to current choice
log.Infof("topology_recovery: checking if should replace promoted slave with a better candidate")
if candidateInstanceKey == nil {
if deadInstance, _, err := inst.ReadInstance(deadInstanceKey); err == nil && deadInstance != nil {
for _, candidateSlave := range candidateSlaves {
if promotedSlave.Key.Equals(&candidateSlave.Key) &&
promotedSlave.DataCenter == deadInstance.DataCenter &&
promotedSlave.PhysicalEnvironment == deadInstance.PhysicalEnvironment {
// Seems like we promoted a candidate in the same DC & ENV as dead IM! Ideal! We're happy!
log.Infof("topology_recovery: promoted slave %+v is the ideal candidate", promotedSlave.Key)
return promotedSlave, nil
}
}
}
}
// We didn't pick the ideal candidate; let's see if we can replace with a candidate from same DC and ENV
if candidateInstanceKey == nil {
// Try a candidate slave that is in same DC & env as the dead instance
if deadInstance, _, err := inst.ReadInstance(deadInstanceKey); err == nil && deadInstance != nil {
for _, candidateSlave := range candidateSlaves {
if candidateSlave.DataCenter == deadInstance.DataCenter &&
candidateSlave.PhysicalEnvironment == deadInstance.PhysicalEnvironment &&
candidateSlave.MasterKey.Equals(&promotedSlave.Key) {
// This would make a great candidate
candidateInstanceKey = &candidateSlave.Key
log.Debugf("topology_recovery: no candidate was offered for %+v but orchestrator picks %+v as candidate replacement, based on being in same DC & env as failed instance", promotedSlave.Key, candidateSlave.Key)
}
}
}
}
if candidateInstanceKey == nil {
// We cannot find a candidate in same DC and ENV as dead master
for _, candidateSlave := range candidateSlaves {
if promotedSlave.Key.Equals(&candidateSlave.Key) {
// Seems like we promoted a candidate slave (though not in same DC and ENV as dead master). Good enough.
// No further action required.
log.Infof("topology_recovery: promoted slave %+v is a good candidate", promotedSlave.Key)
return promotedSlave, nil
}
}
}
// Still nothing?
if candidateInstanceKey == nil {
// Try a candidate slave that is in same DC & env as the promoted slave (our promoted slave is not an "is_candidate")
for _, candidateSlave := range candidateSlaves {
if promotedSlave.DataCenter == candidateSlave.DataCenter &&
promotedSlave.PhysicalEnvironment == candidateSlave.PhysicalEnvironment &&
candidateSlave.MasterKey.Equals(&promotedSlave.Key) {
// OK, better than nothing
candidateInstanceKey = &candidateSlave.Key
log.Debugf("topology_recovery: no candidate was offered for %+v but orchestrator picks %+v as candidate replacement, based on being in same DC & env as promoted instance", promotedSlave.Key, candidateSlave.Key)
}
}
}
// So do we have a candidate?
if candidateInstanceKey == nil {
// Found nothing. Stick with promoted slave
return promotedSlave, nil
}
if promotedSlave.Key.Equals(candidateInstanceKey) {
// Sanity. It IS the candidate
return promotedSlave, nil
}
// Try and promote suggested candidate, if applicable and possible
log.Debugf("topology_recovery: promoted instance %+v is not the suggested candidate %+v. Will see what can be done", promotedSlave.Key, *candidateInstanceKey)
candidateInstance, _, err := inst.ReadInstance(candidateInstanceKey)
if err != nil {
return promotedSlave, log.Errore(err)
}
if candidateInstance.MasterKey.Equals(&promotedSlave.Key) {
log.Debugf("topology_recovery: suggested candidate %+v is slave of promoted instance %+v. Will try and enslave its master", *candidateInstanceKey, promotedSlave.Key)
candidateInstance, err = inst.EnslaveMaster(&candidateInstance.Key)
if err != nil {
return promotedSlave, log.Errore(err)
}
log.Debugf("topology_recovery: success promoting %+v over %+v", *candidateInstanceKey, promotedSlave.Key)
return candidateInstance, nil
}
log.Debugf("topology_recovery: could not manage to promoted suggested candidate %+v", *candidateInstanceKey)
return promotedSlave, nil
}
func (s *TestSuite) TestCluster(c *C) {
inst.ReadInstance(&masterKey)
logic.StartDiscovery(slave1Key)
instances, _ := inst.ReadClusterInstances(fmt.Sprintf("%s:%d", masterKey.Hostname, masterKey.Port))
c.Assert(len(instances) >= 1, Equals, true)
}
func RecoverDeadIntermediateMaster(analysisEntry inst.ReplicationAnalysis, skipProcesses bool) (actionTaken bool, successorInstance *inst.Instance, err error) {
failedInstanceKey := &analysisEntry.AnalyzedInstanceKey
if ok, err := AttemptRecoveryRegistration(&analysisEntry); !ok {
log.Debugf("topology_recovery: found an active or recent recovery on %+v. Will not issue another RecoverDeadIntermediateMaster.", *failedInstanceKey)
return false, nil, err
}
inst.AuditOperation("recover-dead-intermediate-master", failedInstanceKey, "problem found; will recover")
log.Debugf("topology_recovery: RecoverDeadIntermediateMaster: will recover %+v", *failedInstanceKey)
if !skipProcesses {
if err := executeProcesses(config.Config.PreFailoverProcesses, "PreFailoverProcesses", analysisEntry, nil, emptySlavesList, true); err != nil {
return false, nil, err
}
}
intermediateMasterInstance, _, err := inst.ReadInstance(failedInstanceKey)
if err != nil {
return false, nil, err
}
// Plan A: find a replacement intermediate master in same Data Center
candidateSiblingOfIntermediateMaster, err := GetCandidateSiblingOfIntermediateMaster(intermediateMasterInstance)
relocateSlavesToCandidateSibling := func() {
if candidateSiblingOfIntermediateMaster == nil {
return
}
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will attempt a candidate intermediate master: %+v", candidateSiblingOfIntermediateMaster.Key)
// We have a candidate
if relocatedSlaves, candidateSibling, err, errs := inst.RelocateSlaves(failedInstanceKey, &candidateSiblingOfIntermediateMaster.Key, ""); err == nil {
ResolveRecovery(failedInstanceKey, &candidateSibling.Key)
successorInstance = candidateSibling
actionTaken = true
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: move to candidate intermediate master (%+v) went with %d errors", candidateSibling.Key, len(errs))
inst.AuditOperation("recover-dead-intermediate-master", failedInstanceKey, fmt.Sprintf("Done. Relocated %d slaves under candidate sibling: %+v; %d errors: %+v", len(relocatedSlaves), candidateSibling.Key, len(errs), errs))
} else {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: move to candidate intermediate master (%+v) did not complete: %+v", candidateSibling.Key, err)
inst.AuditOperation("recover-dead-intermediate-master", failedInstanceKey, fmt.Sprintf("Relocated %d slaves under candidate sibling: %+v; %d errors: %+v", len(relocatedSlaves), candidateSibling.Key, len(errs), errs))
}
}
if candidateSiblingOfIntermediateMaster != nil && candidateSiblingOfIntermediateMaster.DataCenter == intermediateMasterInstance.DataCenter {
relocateSlavesToCandidateSibling()
}
if !actionTaken {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will next attempt regrouping of slaves")
// Plan B: regroup (we wish to reduce cross-DC replication streams)
_, _, _, _, err = inst.RegroupSlaves(failedInstanceKey, true, nil)
if err != nil {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: regroup failed on: %+v", err)
}
// Plan C: try replacement intermediate master in other DC...
if candidateSiblingOfIntermediateMaster != nil && candidateSiblingOfIntermediateMaster.DataCenter != intermediateMasterInstance.DataCenter {
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will next attempt relocating to another DC server")
relocateSlavesToCandidateSibling()
}
}
if !actionTaken {
// Do we still have leftovers? Some slaves couldn't move? Couldn't regroup? Only left with regroup's resulting leader?
// nothing moved?
// We don't care much if regroup made it or not. We prefer that it made it, in whcih case we only need to relocate up
// one slave, but the operation is still valid if regroup partially/completely failed. We just promote anything
// not regrouped.
// So, match up all that's left, plan D
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: will next attempt to relocate up from %+v", *failedInstanceKey)
var errs []error
var relocatedSlaves [](*inst.Instance)
relocatedSlaves, successorInstance, err, errs = inst.RelocateSlaves(failedInstanceKey, &analysisEntry.AnalyzedInstanceMasterKey, "")
if len(relocatedSlaves) > 0 {
actionTaken = true
log.Debugf("topology_recovery: - RecoverDeadIntermediateMaster: relocated up to %+v", successorInstance.Key)
inst.AuditOperation("recover-dead-intermediate-master", failedInstanceKey, fmt.Sprintf("Done. Relocated slaves under: %+v %d errors: %+v", successorInstance.Key, len(errs), errs))
} else {
err = log.Errorf("topology_recovery: RecoverDeadIntermediateMaster failed to match up any slave from %+v", *failedInstanceKey)
}
}
if successorInstance != nil {
ResolveRecovery(failedInstanceKey, &successorInstance.Key)
} else {
ResolveRecovery(failedInstanceKey, nil)
}
return actionTaken, successorInstance, err
}
// DiscoverInstance will attempt discovering an instance (unless it is already up to date) and will
// list down its master and slaves (if any) for further discovery.
func DiscoverInstance(instanceKey inst.InstanceKey) {
instanceKey.Formalize()
if !instanceKey.IsValid() {
return
}
instance, found, err := inst.ReadInstance(&instanceKey)
if found && instance.IsUpToDate && instance.IsLastCheckValid {
// we've already discovered this one. Skip!
goto Cleanup
}
// First we've ever heard of this instance. Continue investigation:
instance, err = inst.ReadTopologyInstance(&instanceKey)
// panic can occur (IO stuff). Therefore it may happen
// that instance is nil. Check it.
if err != nil || instance == nil {
log.Warningf("instance is nil in DiscoverInstance. key=%+v, error=%+v", instanceKey, err)
goto Cleanup
}
log.Debugf("Discovered host: %+v, master: %+v", instance.Key, instance.MasterKey)
// Investigate slaves:
for _, slaveKey := range instance.SlaveHosts.GetInstanceKeys() {
discoveryInstanceKeys <- slaveKey
}
// Investigate master:
discoveryInstanceKeys <- instance.MasterKey
Cleanup:
}
// Start discovery begins a one time asynchronuous discovery process for the given
// instance and all of its topology connected instances.
// That is, the instance will be investigated for master and slaves, and the routines will follow on
// each and every such found master/slave.
// In essense, assuming all slaves in a replication topology are running, and given a single instance
// in such topology, this function will detect the entire topology.
func StartDiscovery(instanceKey inst.InstanceKey) {
log.Infof("Starting discovery at %+v", instanceKey)
pendingTokens := make(chan bool, maxConcurrency)
completedTokens := make(chan bool, maxConcurrency)
AccountedDiscoverInstance(instanceKey, pendingTokens, completedTokens)
go handleDiscoveryRequests(pendingTokens, completedTokens)
// Block until all are complete
for {
select {
case <-pendingTokens:
<-completedTokens
default:
inst.AuditOperation("start-discovery", &instanceKey, "")
return
}
}
}
// ContinuousDiscovery starts an asynchronuous infinite discovery process where instances are
// periodically investigated and their status captured, and long since unseen instances are
// purged and forgotten.
func ContinuousDiscovery() {
log.Infof("Starting continuous discovery")
inst.LoadHostnameResolveCacheFromDatabase()
go handleDiscoveryRequests(nil, nil)
tick := time.Tick(time.Duration(config.Config.DiscoveryPollSeconds) * time.Second)
forgetUnseenTick := time.Tick(time.Minute)
recoverTick := time.Tick(10 * time.Second)
var snapshotTopologiesTick <-chan time.Time
if config.Config.SnapshotTopologiesIntervalHours > 0 {
snapshotTopologiesTick = time.Tick(time.Duration(config.Config.SnapshotTopologiesIntervalHours) * time.Hour)
}
elected := false
_ = CreateElectionAnchor(false)
for {
select {
case <-tick:
if elected, _ = AttemptElection(); elected {
instanceKeys, _ := inst.ReadOutdatedInstanceKeys()
log.Debugf("outdated keys: %+v", instanceKeys)
for _, instanceKey := range instanceKeys {
discoveryInstanceKeys <- instanceKey
}
} else {
log.Debugf("Not elected as active node; polling")
}
case <-forgetUnseenTick:
// See if we should also forget objects (lower frequency)
go func() {
if elected {
inst.ForgetLongUnseenInstances()
inst.ForgetUnseenInstancesDifferentlyResolved()
inst.ForgetExpiredHostnameResolves()
inst.DeleteInvalidHostnameResolves()
inst.ReviewUnseenInstances()
inst.InjectUnseenMasters()
inst.ResolveUnknownMasterHostnameResolves()
inst.ExpireMaintenance()
inst.ExpireDowntime()
inst.ExpireCandidateInstances()
inst.ExpireHostnameUnresolve()
inst.ExpireClusterDomainName()
}
if !elected {
// Take this opportunity to refresh yourself
inst.LoadHostnameResolveCacheFromDatabase()
}
inst.ReadClusterAliases()
HealthTest()
}()
case <-recoverTick:
go func() {
if elected {
ClearActiveFailureDetections()
ClearActiveRecoveries()
CheckAndRecover(nil, nil, false, false)
}
}()
case <-snapshotTopologiesTick:
go func() {
inst.SnapshotTopologies()
}()
}
}
}
func pollAgent(hostname string) error {
polledAgent, err := agent.GetAgent(hostname)
agent.UpdateAgentLastChecked(hostname)
if err != nil {
return log.Errore(err)
}
err = agent.UpdateAgentInfo(hostname, polledAgent)
if err != nil {
return log.Errore(err)
}
return nil
}
// ContinuousAgentsPoll starts an asynchronuous infinite process where agents are
// periodically investigated and their status captured, and long since unseen agents are
// purged and forgotten.
func ContinuousAgentsPoll() {
log.Infof("Starting continuous agents poll")
go discoverSeededAgents()
tick := time.Tick(time.Duration(config.Config.DiscoveryPollSeconds) * time.Second)
forgetUnseenTick := time.Tick(time.Hour)
for _ = range tick {
agentsHosts, _ := agent.ReadOutdatedAgentsHosts()
log.Debugf("outdated agents hosts: %+v", agentsHosts)
for _, hostname := range agentsHosts {
go pollAgent(hostname)
}
// See if we should also forget agents (lower frequency)
select {
case <-forgetUnseenTick:
agent.ForgetLongUnseenAgents()
agent.FailStaleSeeds()
default:
}
}
}
func discoverSeededAgents() {
for seededAgent := range agent.SeededAgents {
instanceKey := inst.InstanceKey{Hostname: seededAgent.Hostname, Port: int(seededAgent.MySQLPort)}
go StartDiscovery(instanceKey)
}
}