// gossip loops, sending deltas of the infostore and receiving deltas
// in turn. If an alternate is proposed on response, the client addr
// is modified and method returns for forwarding by caller.
func (c *client) gossip(g *Gossip, gossipClient GossipClient, stopper *stop.Stopper) error {
// For un-bootstrapped node, g.is.NodeID is 0 when client start gossip,
// so it's better to get nodeID from g.is every time.
g.mu.Lock()
addr := g.is.NodeAddr
g.mu.Unlock()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
stream, err := gossipClient.Gossip(ctx)
if err != nil {
return err
}
if err := c.requestGossip(g, addr, stream); err != nil {
return err
}
sendGossipChan := make(chan struct{}, 1)
// Register a callback for gossip updates.
updateCallback := func(_ string, _ roachpb.Value) {
select {
case sendGossipChan <- struct{}{}:
default:
}
}
// Defer calling "undoer" callback returned from registration.
defer g.RegisterCallback(".*", updateCallback)()
errCh := make(chan error, 1)
stopper.RunWorker(func() {
errCh <- func() error {
for {
reply, err := stream.Recv()
if err != nil {
return err
}
if err := c.handleResponse(g, reply); err != nil {
return err
}
}
}()
})
for {
select {
case <-c.closer:
return nil
case <-stopper.ShouldStop():
return nil
case err := <-errCh:
return err
case <-sendGossipChan:
if err := c.sendGossip(g, addr, stream); err != nil {
return err
}
}
}
}
// start will run continuously and mark stores as offline if they haven't been
// heard from in longer than timeUntilStoreDead.
func (sp *StorePool) start(stopper *stop.Stopper) {
stopper.RunWorker(func() {
for {
var timeout time.Duration
sp.mu.Lock()
detail := sp.queue.peek()
if detail == nil {
// No stores yet, wait the full timeout.
timeout = sp.timeUntilStoreDead
} else {
// Check to see if the store should be marked as dead.
deadAsOf := detail.lastUpdatedTime.GoTime().Add(sp.timeUntilStoreDead)
now := sp.clock.Now()
if now.GoTime().After(deadAsOf) {
deadDetail := sp.queue.dequeue()
deadDetail.markDead(now)
// The next store might be dead as well, set the timeout to
// 0 to process it immediately.
timeout = 0
} else {
// Store is still alive, schedule the next check for when
// it should timeout.
timeout = deadAsOf.Sub(now.GoTime())
}
}
sp.mu.Unlock()
select {
case <-time.After(timeout):
case <-stopper.ShouldStop():
return
}
}
})
}
// maybeWarnAboutInit looks for signs indicating a cluster which
// hasn't been initialized and warns. There's no absolutely sure way
// to determine whether the current node is simply waiting to be
// bootstrapped to an existing cluster vs. the operator having failed
// to initialize the cluster via the "cockroach init" command, so
// we can only warn.
//
// This method checks whether all gossip bootstrap hosts are
// connected, and whether the node itself is a bootstrap host, but
// there is still no sentinel gossip.
func (g *Gossip) maybeWarnAboutInit(stopper *stop.Stopper) {
stopper.RunWorker(func() {
// Wait 5s before first check.
select {
case <-stopper.ShouldStop():
return
case <-time.After(5 * time.Second):
}
retryOptions := retry.Options{
InitialBackoff: 5 * time.Second, // first backoff at 5s
MaxBackoff: 60 * time.Second, // max backoff is 60s
Multiplier: 2, // doubles
Stopper: stopper, // stop no matter what on stopper
}
// This will never error because of infinite retries.
for r := retry.Start(retryOptions); r.Next(); {
g.mu.Lock()
hasSentinel := g.is.getInfo(KeySentinel) != nil
triedAll := g.triedAll
g.mu.Unlock()
// If we have the sentinel, exit the retry loop.
if hasSentinel {
break
}
// Otherwise, if all bootstrap hosts are connected, warn.
if triedAll {
log.Warningf("connected to gossip but missing sentinel. Has the cluster been initialized? " +
"Use \"cockroach init\" to initialize.")
}
}
})
}
// bootstrap connects the node to the gossip network. Bootstrapping
// commences in the event there are no connected clients or the
// sentinel gossip info is not available. After a successful bootstrap
// connection, this method will block on the stalled condvar, which
// receives notifications that gossip network connectivity has been
// lost and requires re-bootstrapping.
func (g *Gossip) bootstrap(stopper *stop.Stopper) {
stopper.RunWorker(func() {
for {
g.mu.Lock()
if g.closed {
g.mu.Unlock()
return
}
// Check whether or not we need bootstrap.
haveClients := g.outgoing.len() > 0
haveSentinel := g.is.getInfo(KeySentinel) != nil
if !haveClients || !haveSentinel {
// Try to get another bootstrap address from the resolvers.
if addr := g.getNextBootstrapAddress(); addr != nil {
g.startClient(addr, g.bsRPCContext, stopper)
}
}
g.mu.Unlock()
// Block until we need bootstrapping again.
select {
case <-g.stalled:
// continue
case <-stopper.ShouldStop():
return
}
}
})
}
// startGossip loops on a periodic ticker to gossip node-related
// information. Starts a goroutine to loop until the node is closed.
func (n *Node) startGossip(ctx context.Context, stopper *stop.Stopper) {
stopper.RunWorker(func() {
gossipStoresInterval := envutil.EnvOrDefaultDuration("gossip_stores_interval",
gossip.DefaultGossipStoresInterval)
statusTicker := time.NewTicker(gossipStatusInterval)
storesTicker := time.NewTicker(gossipStoresInterval)
nodeTicker := time.NewTicker(gossipNodeDescriptorInterval)
defer storesTicker.Stop()
defer nodeTicker.Stop()
n.gossipStores(ctx) // one-off run before going to sleep
for {
select {
case <-statusTicker.C:
n.ctx.Gossip.LogStatus()
case <-storesTicker.C:
n.gossipStores(ctx)
case <-nodeTicker.C:
if err := n.ctx.Gossip.SetNodeDescriptor(&n.Descriptor); err != nil {
log.Warningf(ctx, "couldn't gossip descriptor for node %d: %s", n.Descriptor.NodeID, err)
}
case <-stopper.ShouldStop():
return
}
}
})
}
// waitAndProcess waits for the pace interval and processes the replica
// if repl is not nil. The method returns true when the scanner needs
// to be stopped. The method also removes a replica from queues when it
// is signaled via the removed channel.
func (rs *replicaScanner) waitAndProcess(start time.Time, clock *hlc.Clock, stopper *stop.Stopper,
repl *Replica) bool {
waitInterval := rs.paceInterval(start, timeutil.Now())
rs.waitTimer.Reset(waitInterval)
if log.V(6) {
log.Infof("Wait time interval set to %s", waitInterval)
}
for {
select {
case <-rs.waitTimer.C:
rs.waitTimer.Read = true
if repl == nil {
return false
}
return !stopper.RunTask(func() {
// Try adding replica to all queues.
for _, q := range rs.queues {
q.MaybeAdd(repl, clock.Now())
}
})
case repl := <-rs.removed:
// Remove replica from all queues as applicable.
for _, q := range rs.queues {
q.MaybeRemove(repl)
}
if log.V(6) {
log.Infof("removed replica %s", repl)
}
case <-stopper.ShouldStop():
return true
}
}
}
// waitAndProcess waits for the pace interval and processes the replica
// if repl is not nil. The method returns true when the scanner needs
// to be stopped. The method also removes a replica from queues when it
// is signaled via the removed channel.
func (rs *replicaScanner) waitAndProcess(
start time.Time, clock *hlc.Clock, stopper *stop.Stopper, repl *Replica,
) bool {
waitInterval := rs.paceInterval(start, timeutil.Now())
rs.waitTimer.Reset(waitInterval)
if log.V(6) {
log.Infof(context.TODO(), "wait timer interval set to %s", waitInterval)
}
for {
select {
case <-rs.waitTimer.C:
if log.V(6) {
log.Infof(context.TODO(), "wait timer fired")
}
rs.waitTimer.Read = true
if repl == nil {
return false
}
return nil != stopper.RunTask(func() {
// Try adding replica to all queues.
for _, q := range rs.queues {
q.MaybeAdd(repl, clock.Now())
}
})
case repl := <-rs.removed:
rs.removeReplica(repl)
case <-stopper.ShouldStop():
return true
}
}
}
// NewExecutor creates an Executor and registers a callback on the
// system config.
func NewExecutor(ctx ExecutorContext, stopper *stop.Stopper, registry *metric.Registry) *Executor {
exec := &Executor{
ctx: ctx,
reCache: parser.NewRegexpCache(512),
registry: registry,
latency: registry.Latency("latency"),
txnBeginCount: registry.Counter("txn.begin.count"),
txnCommitCount: registry.Counter("txn.commit.count"),
txnAbortCount: registry.Counter("txn.abort.count"),
txnRollbackCount: registry.Counter("txn.rollback.count"),
selectCount: registry.Counter("select.count"),
updateCount: registry.Counter("update.count"),
insertCount: registry.Counter("insert.count"),
deleteCount: registry.Counter("delete.count"),
ddlCount: registry.Counter("ddl.count"),
miscCount: registry.Counter("misc.count"),
}
exec.systemConfigCond = sync.NewCond(exec.systemConfigMu.RLocker())
gossipUpdateC := ctx.Gossip.RegisterSystemConfigChannel()
stopper.RunWorker(func() {
for {
select {
case <-gossipUpdateC:
cfg, _ := ctx.Gossip.GetSystemConfig()
exec.updateSystemConfig(cfg)
case <-stopper.ShouldStop():
return
}
}
})
return exec
}
// NewExecutor creates an Executor and registers a callback on the
// system config.
func NewExecutor(db client.DB, gossip *gossip.Gossip, leaseMgr *LeaseManager, metaRegistry *metric.Registry, stopper *stop.Stopper) *Executor {
exec := &Executor{
db: db,
reCache: parser.NewRegexpCache(512),
leaseMgr: leaseMgr,
latency: metaRegistry.Latency("sql.latency"),
}
exec.systemConfigCond = sync.NewCond(&exec.systemConfigMu)
gossipUpdateC := gossip.RegisterSystemConfigChannel()
stopper.RunWorker(func() {
for {
select {
case <-gossipUpdateC:
cfg := gossip.GetSystemConfig()
exec.updateSystemConfig(cfg)
case <-stopper.ShouldStop():
return
}
}
})
return exec
}
// NewExecutor creates an Executor and registers a callback on the
// system config.
func NewExecutor(db client.DB, gossip *gossip.Gossip, leaseMgr *LeaseManager, stopper *stop.Stopper) *Executor {
registry := metric.NewRegistry()
exec := &Executor{
db: db,
reCache: parser.NewRegexpCache(512),
leaseMgr: leaseMgr,
registry: registry,
latency: registry.Latency("latency"),
txnBeginCount: registry.Counter("transaction.begincount"),
selectCount: registry.Counter("select.count"),
updateCount: registry.Counter("update.count"),
insertCount: registry.Counter("insert.count"),
deleteCount: registry.Counter("delete.count"),
ddlCount: registry.Counter("ddl.count"),
miscCount: registry.Counter("misc.count"),
}
exec.systemConfigCond = sync.NewCond(&exec.systemConfigMu)
gossipUpdateC := gossip.RegisterSystemConfigChannel()
stopper.RunWorker(func() {
for {
select {
case <-gossipUpdateC:
cfg := gossip.GetSystemConfig()
exec.updateSystemConfig(cfg)
case <-stopper.ShouldStop():
return
}
}
})
return exec
}
// start initializes the infostore with the rpc server address and
// then begins processing connecting clients in an infinite select
// loop via goroutine. Periodically, clients connected and awaiting
// the next round of gossip are awoken via the conditional variable.
func (s *server) start(rpcServer *rpc.Server, stopper *stop.Stopper) {
addr := rpcServer.Addr()
s.is.NodeAddr = util.MakeUnresolvedAddr(addr.Network(), addr.String())
if err := rpcServer.Register("Gossip.Gossip", s.Gossip, &Request{}); err != nil {
log.Fatalf("unable to register gossip service with RPC server: %s", err)
}
rpcServer.AddCloseCallback(s.onClose)
updateCallback := func(_ string, _ roachpb.Value) {
// Wakeup all pending clients.
s.ready.Broadcast()
}
unregister := s.is.registerCallback(".*", updateCallback)
stopper.RunWorker(func() {
// Periodically wakeup blocked client gossip requests.
for {
select {
case <-stopper.ShouldStop():
s.stop(unregister)
return
}
}
})
}
// RefreshLeases starts a goroutine that refreshes the lease manager
// leases for tables received in the latest system configuration via gossip.
func (m *LeaseManager) RefreshLeases(s *stop.Stopper, db *client.DB, gossip *gossip.Gossip) {
s.RunWorker(func() {
descKeyPrefix := keys.MakeTablePrefix(uint32(sqlbase.DescriptorTable.ID))
gossipUpdateC := gossip.RegisterSystemConfigChannel()
for {
select {
case <-gossipUpdateC:
cfg, _ := gossip.GetSystemConfig()
if m.testingKnobs.GossipUpdateEvent != nil {
m.testingKnobs.GossipUpdateEvent(cfg)
}
// Read all tables and their versions
if log.V(2) {
log.Info("received a new config; will refresh leases")
}
// Loop through the configuration to find all the tables.
for _, kv := range cfg.Values {
if !bytes.HasPrefix(kv.Key, descKeyPrefix) {
continue
}
// Attempt to unmarshal config into a table/database descriptor.
var descriptor sqlbase.Descriptor
if err := kv.Value.GetProto(&descriptor); err != nil {
log.Warningf("%s: unable to unmarshal descriptor %v", kv.Key, kv.Value)
continue
}
switch union := descriptor.Union.(type) {
case *sqlbase.Descriptor_Table:
table := union.Table
if err := table.Validate(); err != nil {
log.Errorf("%s: received invalid table descriptor: %v", kv.Key, table)
continue
}
if log.V(2) {
log.Infof("%s: refreshing lease table: %d (%s), version: %d",
kv.Key, table.ID, table.Name, table.Version)
}
// Try to refresh the table lease to one >= this version.
if t := m.findTableState(table.ID, false /* create */, nil); t != nil {
if err := t.purgeOldLeases(
db, table.Deleted(), table.Version, m.LeaseStore); err != nil {
log.Warningf("error purging leases for table %d(%s): %s",
table.ID, table.Name, err)
}
}
case *sqlbase.Descriptor_Database:
// Ignore.
}
}
if m.testingKnobs.TestingLeasesRefreshedEvent != nil {
m.testingKnobs.TestingLeasesRefreshedEvent(cfg)
}
case <-s.ShouldStop():
return
}
}
})
}
// waitAndProcess waits for the pace interval and processes the range
// if rng is not nil. The method returns true when the scanner needs
// to be stopped. The method also removes a range from queues when it
// is signaled via the removed channel.
func (rs *rangeScanner) waitAndProcess(start time.Time, clock *hlc.Clock, stopper *stop.Stopper,
rng *Replica) bool {
waitInterval := rs.paceInterval(start, time.Now())
nextTime := time.After(waitInterval)
if log.V(6) {
log.Infof("Wait time interval set to %s", waitInterval)
}
for {
select {
case <-nextTime:
if rng == nil {
return false
}
return !stopper.RunTask(func() {
// Try adding range to all queues.
for _, q := range rs.queues {
q.MaybeAdd(rng, clock.Now())
}
})
case rng := <-rs.removed:
// Remove range from all queues as applicable.
for _, q := range rs.queues {
q.MaybeRemove(rng)
}
if log.V(6) {
log.Infof("removed range %s", rng)
}
case <-stopper.ShouldStop():
return true
}
}
}
func (e *eventDemux) start(stopper *stop.Stopper) {
stopper.RunWorker(func() {
for {
select {
case events := <-e.events:
for _, event := range events {
switch event := event.(type) {
case *EventLeaderElection:
e.LeaderElection <- event
case *EventCommandCommitted:
e.CommandCommitted <- event
case *EventMembershipChangeCommitted:
e.MembershipChangeCommitted <- event
default:
panic(fmt.Sprintf("got unknown event type %T", event))
}
}
case <-stopper.ShouldStop():
close(e.CommandCommitted)
close(e.MembershipChangeCommitted)
close(e.LeaderElection)
return
}
}
})
}
// maybeWarnAboutInit looks for signs indicating a cluster which
// hasn't been initialized and warns. There's no absolutely sure way
// to determine whether the current node is simply waiting to be
// bootstrapped to an existing cluster vs. the operator having failed
// to initialize the cluster via the "cockroach init" command, so
// we can only warn.
//
// This method checks whether all gossip bootstrap hosts are
// connected, and whether the node itself is a bootstrap host, but
// there is still no sentinel gossip.
func (g *Gossip) maybeWarnAboutInit(stopper *stop.Stopper) {
stopper.RunWorker(func() {
// Wait 5s before first check.
select {
case <-stopper.ShouldStop():
return
case <-time.After(5 * time.Second):
}
retryOptions := retry.Options{
InitialBackoff: 5 * time.Second, // first backoff at 5s
MaxBackoff: 60 * time.Second, // max backoff is 60s
Multiplier: 2, // doubles
Closer: stopper.ShouldStop(), // stop no matter what on stopper
}
// This will never error because of infinite retries.
for r := retry.Start(retryOptions); r.Next(); {
g.mu.Lock()
hasConnections := g.outgoing.len()+g.incoming.len() > 0
hasSentinel := g.is.getInfo(KeySentinel) != nil
triedAll := g.triedAll
g.mu.Unlock()
// If we have the sentinel, exit the retry loop.
if hasSentinel {
break
}
if !hasConnections {
log.Warningf("not connected to gossip; check that gossip flag is set appropriately")
} else if triedAll {
log.Warningf("missing gossip sentinel; first range unavailable or cluster not initialized")
}
}
})
}
// gossip loops, sending deltas of the infostore and receiving deltas
// in turn. If an alternate is proposed on response, the client addr
// is modified and method returns for forwarding by caller.
func (c *client) gossip(g *Gossip, stopper *stop.Stopper) error {
// For un-bootstrapped node, g.is.NodeID is 0 when client start gossip,
// so it's better to get nodeID from g.is every time.
g.mu.Lock()
addr := util.MakeUnresolvedAddr(g.is.NodeAddr.Network(), g.is.NodeAddr.String())
g.mu.Unlock()
lAddr := util.MakeUnresolvedAddr(c.rpcClient.LocalAddr().Network(), c.rpcClient.LocalAddr().String())
done := make(chan *netrpc.Call, 10)
c.getGossip(g, addr, lAddr, done)
// Register a callback for gossip updates.
updateCallback := func(_ string, _ roachpb.Value) {
c.sendGossip(g, addr, lAddr, done)
}
// Defer calling "undoer" callback returned from registration.
defer g.RegisterCallback(".*", updateCallback)()
// Loop until stopper is signalled, or until either the gossip or
// RPC clients are closed. getGossip is a hanging get, returning
// results only when the remote server has new gossip information to
// share. sendGossip is sent to the remote server when this node has
// new gossip information to share with the server.
//
// Nodes "pull" gossip in order to guarantee that they're connected
// to the sentinel and not too distant from other nodes in the
// network. The also "push" their own gossip which guarantees that
// the sentinel node will contain their info, and therefore every
// node connected to the sentinel. Just pushing or just pulling
// wouldn't guarantee a fully connected network.
for {
select {
case call := <-done:
if err := c.handleGossip(g, call); err != nil {
return err
}
req := call.Args.(*Request)
// If this was from a gossip pull request, fetch again.
if req.Delta == nil {
c.getGossip(g, addr, lAddr, done)
} else {
// Otherwise, it's a gossip push request; set sendingGossip
// flag false and maybe send more gossip if there have been
// additional updates.
g.mu.Lock()
c.sendingGossip = false
g.mu.Unlock()
c.sendGossip(g, addr, lAddr, done)
}
case <-c.rpcClient.Closed:
return util.Errorf("client closed")
case <-c.closer:
return nil
case <-stopper.ShouldStop():
return nil
}
}
}
// processLoop processes the entries in the queue until the provided
// stopper signals exit.
//
// TODO(spencer): current load should factor into replica processing timer.
func (bq *baseQueue) processLoop(clock *hlc.Clock, stopper *stop.Stopper) {
stopper.RunWorker(func() {
defer func() {
bq.mu.Lock()
bq.mu.stopped = true
bq.mu.Unlock()
log.FinishEventLog(bq.ctx)
}()
// nextTime is initially nil; we don't start any timers until the queue
// becomes non-empty.
var nextTime <-chan time.Time
immediately := make(chan time.Time)
close(immediately)
for {
select {
// Exit on stopper.
case <-stopper.ShouldStop():
return
// Incoming signal sets the next time to process if there were previously
// no replicas in the queue.
case <-bq.incoming:
if nextTime == nil {
// When a replica is added, wake up immediately. This is mainly
// to facilitate testing without unnecessary sleeps.
nextTime = immediately
// In case we're in a test, still block on the impl.
bq.impl.timer()
}
// Process replicas as the timer expires.
case <-nextTime:
repl := bq.pop()
if repl != nil {
if stopper.RunTask(func() {
if err := bq.processReplica(repl, clock); err != nil {
// Maybe add failing replica to purgatory if the queue supports it.
bq.maybeAddToPurgatory(repl, err, clock, stopper)
}
}) != nil {
return
}
}
if bq.Length() == 0 {
nextTime = nil
} else {
nextTime = time.After(bq.impl.timer())
}
}
}
})
}
// NewContextWithStopper returns a context whose Done() channel is closed when
// base's Done() channel is closed or when stopper's ShouldStop() channel is
// closed, whichever is first.
func NewContextWithStopper(base context.Context, stopper *stop.Stopper) context.Context {
ctx, cancel := context.WithCancel(base)
go func() {
select {
case <-ctx.Done():
case <-stopper.ShouldStop():
cancel()
}
}()
return ctx
}
// ListenAndServe creates a listener and serves handler on it, closing
// the listener when signalled by the stopper.
func ListenAndServe(stopper *stop.Stopper, handler http.Handler, addr net.Addr, config *tls.Config) (net.Listener, error) {
ln, err := net.Listen(addr.Network(), addr.String())
if err != nil {
return nil, err
}
newAddr, err := updatedAddr(addr, ln.Addr())
if err != nil {
return nil, err
}
if config != nil {
ln = tls.NewListener(ln, config)
}
stopper.RunWorker(func() {
var mu sync.Mutex
activeConns := make(map[net.Conn]struct{})
httpServer := http.Server{
Handler: handler,
ConnState: func(conn net.Conn, state http.ConnState) {
mu.Lock()
switch state {
case http.StateNew:
activeConns[conn] = struct{}{}
case http.StateClosed:
delete(activeConns, conn)
}
mu.Unlock()
},
}
if err := httpServer.Serve(ln); err != nil && !IsClosedConnection(err) {
log.Fatal(err)
}
mu.Lock()
for conn := range activeConns {
conn.Close()
}
mu.Unlock()
})
stopper.RunWorker(func() {
<-stopper.ShouldStop()
// Some unit tests manually close `ln`, so it may already be closed
// when we get here.
if err := ln.Close(); err != nil && !IsClosedConnection(err) {
log.Fatal(err)
}
})
return listener{newAddr, ln}, nil
}
// RefreshLeases starts a goroutine that refreshes the lease manager
// leases for tables received in the latest system configuration via gossip.
func (m *LeaseManager) RefreshLeases(s *stop.Stopper, db *client.DB, gossip *gossip.Gossip) {
s.RunWorker(func() {
descKeyPrefix := keys.MakeTablePrefix(uint32(DescriptorTable.ID))
gossip.RegisterSystemConfigCallback(m.updateSystemConfig)
for {
select {
case <-m.newConfig:
// Read all tables and their versions
cfg := m.getSystemConfig()
if log.V(2) {
log.Info("received a new config %v", cfg)
}
// Loop through the configuration to find all the tables.
for _, kv := range cfg.Values {
if kv.Value.Tag != roachpb.ValueType_BYTES {
continue
}
if !bytes.HasPrefix(kv.Key, descKeyPrefix) {
continue
}
// Attempt to unmarshal config into a table/database descriptor.
var descriptor Descriptor
if err := kv.Value.GetProto(&descriptor); err != nil {
log.Warningf("unable to unmarshal descriptor %v", kv.Value)
continue
}
switch union := descriptor.Union.(type) {
case *Descriptor_Table:
table := union.Table
if err := table.Validate(); err != nil {
log.Errorf("received invalid table descriptor: %v", table)
continue
}
if log.V(2) {
log.Infof("refreshing lease table: %d, version: %d", table.ID, table.Version)
}
// Try to refresh the table lease to one >= this version.
if err := m.refreshLease(db, table.ID, table.Version); err != nil {
log.Warning(err)
}
case *Descriptor_Database:
// Ignore.
}
}
case <-s.ShouldStop():
return
}
}
})
}
// start runs the storage loop in a goroutine.
func (w *writeTask) start(stopper *stop.Stopper) {
stopper.RunWorker(func() {
for {
var request *writeRequest
select {
case <-w.ready:
continue
case <-stopper.ShouldStop():
return
case request = <-w.in:
}
if log.V(6) {
log.Infof("writeTask got request %#v", *request)
}
response := &writeResponse{make(map[roachpb.RangeID]*groupWriteResponse)}
for groupID, groupReq := range request.groups {
group, err := w.storage.GroupStorage(groupID, groupReq.replicaID)
if err == ErrGroupDeleted {
if log.V(4) {
log.Infof("dropping write to deleted group %v", groupID)
}
continue
} else if err != nil {
log.Fatalf("GroupStorage(group %s, replica %s) failed: %s", groupID,
groupReq.replicaID, err)
}
groupResp := &groupWriteResponse{raftpb.HardState{}, -1, -1, groupReq.entries}
response.groups[groupID] = groupResp
if !raft.IsEmptyHardState(groupReq.state) {
err := group.SetHardState(groupReq.state)
if err != nil {
panic(err) // TODO(bdarnell): mark this node dead on storage errors
}
groupResp.state = groupReq.state
}
if !raft.IsEmptySnap(groupReq.snapshot) {
err := group.ApplySnapshot(groupReq.snapshot)
if err != nil {
panic(err) // TODO(bdarnell)
}
}
if len(groupReq.entries) > 0 {
err := group.Append(groupReq.entries)
if err != nil {
panic(err) // TODO(bdarnell)
}
}
}
w.out <- response
}
})
}
// ListenAndServe creates a listener and serves handler on it, closing
// the listener when signalled by the stopper.
func ListenAndServe(stopper *stop.Stopper, handler http.Handler, addr net.Addr, tlsConfig *tls.Config) (net.Listener, error) {
ln, err := Listen(addr, tlsConfig)
if err != nil {
return nil, err
}
var mu sync.Mutex
activeConns := make(map[net.Conn]struct{})
httpServer := http.Server{
TLSConfig: tlsConfig,
Handler: handler,
ConnState: func(conn net.Conn, state http.ConnState) {
mu.Lock()
switch state {
case http.StateNew:
activeConns[conn] = struct{}{}
case http.StateClosed:
delete(activeConns, conn)
}
mu.Unlock()
},
}
if err := http2.ConfigureServer(&httpServer, nil); err != nil {
return nil, err
}
stopper.RunWorker(func() {
if err := httpServer.Serve(ln); err != nil && !IsClosedConnection(err) {
log.Fatal(err)
}
<-stopper.ShouldStop()
mu.Lock()
for conn := range activeConns {
conn.Close()
}
mu.Unlock()
})
stopper.RunWorker(func() {
<-stopper.ShouldDrain()
// Some unit tests manually close `ln`, so it may already be closed
// when we get here.
if err := ln.Close(); err != nil && !IsClosedConnection(err) {
log.Fatal(err)
}
})
return ln, nil
}
// startGossip loops on a periodic ticker to gossip node-related
// information. Starts a goroutine to loop until the node is closed.
func (n *Node) startGossip(stopper *stop.Stopper) {
stopper.RunWorker(func() {
ticker := time.NewTicker(gossipInterval)
defer ticker.Stop()
n.gossipStores() // one-off run before going to sleep
for {
select {
case <-ticker.C:
n.gossipStores()
case <-stopper.ShouldStop():
return
}
}
})
}
// manage manages outgoing clients. Periodically, the infostore is
// scanned for infos with hop count exceeding maxToleratedHops()
// threshold. If the number of outgoing clients doesn't exceed
// MaxPeers, a new gossip client is connected to a randomly selected
// peer beyond maxToleratedHops threshold. Otherwise, the least useful
// peer node is cut off to make room for a replacement. Disconnected
// clients are processed via the disconnected channel and taken out of
// the outgoing address set. If there are no longer any outgoing
// connections or the sentinel gossip is unavailable, the bootstrapper
// is notified via the stalled conditional variable.
func (g *Gossip) manage(stopper *stop.Stopper) {
stopper.RunWorker(func() {
// Loop until closed and there are no remaining outgoing connections.
for {
select {
case <-stopper.ShouldStop():
return
case c := <-g.disconnected:
g.doDisconnected(stopper, c)
case <-time.After(g.jitteredGossipInterval()):
g.doCheckTimeout(stopper)
}
}
})
}
// gossip loops, sending deltas of the infostore and receiving deltas
// in turn. If an alternate is proposed on response, the client addr
// is modified and method returns for forwarding by caller.
func (c *client) gossip(ctx context.Context, g *Gossip, stream Gossip_GossipClient, stopper *stop.Stopper, wg *sync.WaitGroup) error {
sendGossipChan := make(chan struct{}, 1)
// Register a callback for gossip updates.
updateCallback := func(_ string, _ roachpb.Value) {
select {
case sendGossipChan <- struct{}{}:
default:
}
}
// Defer calling "undoer" callback returned from registration.
defer g.RegisterCallback(".*", updateCallback)()
errCh := make(chan error, 1)
// This wait group is used to allow the caller to wait until gossip
// processing is terminated.
wg.Add(1)
stopper.RunWorker(func() {
defer wg.Done()
errCh <- func() error {
for {
reply, err := stream.Recv()
if err != nil {
return err
}
if err := c.handleResponse(g, reply); err != nil {
return err
}
}
}()
})
for {
select {
case <-c.closer:
return nil
case <-stopper.ShouldStop():
return nil
case err := <-errCh:
return err
case <-sendGossipChan:
if err := c.sendGossip(g, stream); err != nil {
return err
}
}
}
}
// processEventsUntil reads and acknowledges messages from the given channel
// until either the given conditional returns true, the channel is closed or a
// read on the channel times out.
func processEventsUntil(ch <-chan *interceptMessage, stopper *stop.Stopper, f func(*RaftMessageRequest) bool) {
for {
select {
case e, ok := <-ch:
if !ok {
return
}
e.ack <- struct{}{}
if f(e.args.(*RaftMessageRequest)) {
return
}
case <-stopper.ShouldStop():
return
}
}
}
// runHeartbeat sends periodic heartbeats to client. Closes the
// connection on error. Heartbeats are sent in an infinite loop until
// an error is encountered.
func (c *Client) runHeartbeat(stopper *stop.Stopper) {
if log.V(2) {
log.Infof("client %s starting heartbeat", c.Addr())
}
for {
select {
case <-stopper.ShouldStop():
return
case <-time.After(heartbeatInterval):
if err := c.heartbeat(); err != nil {
log.Infof("client %s heartbeat failed: %v; recycling...", c.Addr(), err)
return
}
}
}
}
// manage manages outgoing clients. Periodically, the infostore is
// scanned for infos with hop count exceeding the MaxHops
// threshold. If the number of outgoing clients doesn't exceed
// maxPeers(), a new gossip client is connected to a randomly selected
// peer beyond MaxHops threshold. Otherwise, the least useful peer
// node is cut off to make room for a replacement. Disconnected
// clients are processed via the disconnected channel and taken out of
// the outgoing address set. If there are no longer any outgoing
// connections or the sentinel gossip is unavailable, the bootstrapper
// is notified via the stalled conditional variable.
func (g *Gossip) manage(stopper *stop.Stopper) {
stopper.RunWorker(func() {
// Loop until closed and there are no remaining outgoing connections.
for {
select {
case <-stopper.ShouldStop():
return
case c := <-g.disconnected:
g.doDisconnected(stopper, c)
case <-time.After(g.jitteredInterval(checkInterval)):
g.doCheckNetwork(stopper)
case <-time.After(g.jitteredInterval(stallInterval)):
g.maybeSignalStalledLocked()
}
}
})
}
// startComputePeriodidMetrics starts a loop which periodically instructs each
// store to compute the value of metrics which cannot be incrementally
// maintained.
func (n *Node) startComputePeriodicMetrics(stopper *stop.Stopper) {
stopper.RunWorker(func() {
// Publish status at the same frequency as metrics are collected.
ticker := time.NewTicker(publishStatusInterval)
defer ticker.Stop()
for tick := 0; ; tick++ {
select {
case <-ticker.C:
if err := n.computePeriodicMetrics(tick); err != nil {
log.Errorf(n.Ctx(), "failed computing periodic metrics: %s", err)
}
case <-stopper.ShouldStop():
return
}
}
})
}
// processLoop processes the entries in the queue until the provided
// stopper signals exit.
//
// TODO(spencer): current load should factor into replica processing timer.
func (bq *baseQueue) processLoop(clock *hlc.Clock, stopper *stop.Stopper) {
stopper.RunWorker(func() {
// nextTime is initially nil; we don't start any timers until the queue
// becomes non-empty.
var nextTime <-chan time.Time
immediately := make(chan time.Time)
close(immediately)
for {
select {
// Incoming signal sets the next time to process if there were previously
// no replicas in the queue.
case <-bq.incoming:
if nextTime == nil {
// When a replica is added, wake up immediately. This is mainly
// to facilitate testing without unnecessary sleeps.
nextTime = immediately
// In case we're in a test, still block on the impl.
bq.impl.timer()
}
// Process replicas as the timer expires.
case <-nextTime:
stopper.RunTask(func() {
bq.processOne(clock)
})
if bq.Length() == 0 {
nextTime = nil
} else {
nextTime = time.After(bq.impl.timer())
}
// Exit on stopper.
case <-stopper.ShouldStop():
bq.Lock()
bq.replicas = map[proto.RangeID]*replicaItem{}
bq.priorityQ = nil
bq.Unlock()
return
}
}
})
}
