// CopyShardReplications will create the ShardReplication objects in
// the destination topo
func CopyShardReplications(fromTS, toTS topo.Server) {
keyspaces, err := fromTS.GetKeyspaces()
if err != nil {
log.Fatalf("fromTS.GetKeyspaces: %v", err)
}
wg := sync.WaitGroup{}
rec := concurrency.AllErrorRecorder{}
for _, keyspace := range keyspaces {
wg.Add(1)
go func(keyspace string) {
defer wg.Done()
shards, err := fromTS.GetShardNames(keyspace)
if err != nil {
rec.RecordError(fmt.Errorf("GetShardNames(%v): %v", keyspace, err))
return
}
for _, shard := range shards {
wg.Add(1)
go func(keyspace, shard string) {
defer wg.Done()
// read the source shard to get the cells
si, err := fromTS.GetShard(keyspace, shard)
if err != nil {
rec.RecordError(fmt.Errorf("GetShard(%v, %v): %v", keyspace, shard, err))
return
}
for _, cell := range si.Cells {
sri, err := fromTS.GetShardReplication(cell, keyspace, shard)
if err != nil {
rec.RecordError(fmt.Errorf("GetShardReplication(%v, %v, %v): %v", cell, keyspace, shard, err))
continue
}
if err := toTS.UpdateShardReplicationFields(cell, keyspace, shard, func(oldSR *topo.ShardReplication) error {
*oldSR = *sri.ShardReplication
return nil
}); err != nil {
rec.RecordError(fmt.Errorf("UpdateShardReplicationFields(%v, %v, %v): %v", cell, keyspace, shard, err))
}
}
}(keyspace, shard)
}
}(keyspace)
}
wg.Wait()
if rec.HasErrors() {
log.Fatalf("copyShards failed: %v", rec.Error())
}
}
// Update shard file with new master, replicas, etc.
//
// Re-read from TopologyServer to make sure we are using the side
// effects of all actions.
//
// This function locks individual SvrShard paths, so it doesn't need a lock
// on the shard.
func RebuildShard(ctx context.Context, log logutil.Logger, ts topo.Server, keyspace, shard string, cells []string, timeout time.Duration, interrupted chan struct{}) (*topo.ShardInfo, error) {
log.Infof("RebuildShard %v/%v", keyspace, shard)
span := trace.NewSpanFromContext(ctx)
span.StartLocal("topotools.RebuildShard")
defer span.Finish()
ctx = trace.NewContext(ctx, span)
// read the existing shard info. It has to exist.
shardInfo, err := ts.GetShard(keyspace, shard)
if err != nil {
return nil, err
}
// rebuild all cells in parallel
wg := sync.WaitGroup{}
rec := concurrency.AllErrorRecorder{}
for _, cell := range shardInfo.Cells {
// skip this cell if we shouldn't rebuild it
if !topo.InCellList(cell, cells) {
continue
}
// start with the master if it's in the current cell
tabletsAsMap := make(map[topo.TabletAlias]bool)
if shardInfo.MasterAlias.Cell == cell {
tabletsAsMap[shardInfo.MasterAlias] = true
}
wg.Add(1)
go func(cell string) {
defer wg.Done()
// Lock the SrvShard so we don't race with other rebuilds of the same
// shard in the same cell (e.g. from our peer tablets).
actionNode := actionnode.RebuildSrvShard()
lockPath, err := actionNode.LockSrvShard(ctx, ts, cell, keyspace, shard, timeout, interrupted)
if err != nil {
rec.RecordError(err)
return
}
// read the ShardReplication object to find tablets
sri, err := ts.GetShardReplication(cell, keyspace, shard)
if err != nil {
rec.RecordError(fmt.Errorf("GetShardReplication(%v, %v, %v) failed: %v", cell, keyspace, shard, err))
return
}
// add all relevant tablets to the map
for _, rl := range sri.ReplicationLinks {
tabletsAsMap[rl.TabletAlias] = true
if rl.Parent.Cell == cell {
tabletsAsMap[rl.Parent] = true
}
}
// convert the map to a list
aliases := make([]topo.TabletAlias, 0, len(tabletsAsMap))
for a := range tabletsAsMap {
aliases = append(aliases, a)
}
// read all the Tablet records
tablets, err := topo.GetTabletMap(ctx, ts, aliases)
switch err {
case nil:
// keep going, we're good
case topo.ErrPartialResult:
log.Warningf("Got ErrPartialResult from topo.GetTabletMap in cell %v, some tablets may not be added properly to serving graph", cell)
default:
rec.RecordError(fmt.Errorf("GetTabletMap in cell %v failed: %v", cell, err))
return
}
// write the data we need to
rebuildErr := rebuildCellSrvShard(ctx, log, ts, shardInfo, cell, tablets)
// and unlock
if err := actionNode.UnlockSrvShard(ctx, ts, cell, keyspace, shard, lockPath, rebuildErr); err != nil {
rec.RecordError(err)
}
}(cell)
}
wg.Wait()
return shardInfo, rec.Error()
}
// ChangeType changes the type of the tablet and possibly also updates
// the health informaton for it. Make this external, since these
// transitions need to be forced from time to time.
//
// - if health is nil, we don't touch the Tablet's Health record.
// - if health is an empty map, we clear the Tablet's Health record.
// - if health has values, we overwrite the Tablet's Health record.
func ChangeType(ts topo.Server, tabletAlias topo.TabletAlias, newType topo.TabletType, health map[string]string, runHooks bool) error {
tablet, err := ts.GetTablet(tabletAlias)
if err != nil {
return err
}
if !topo.IsTrivialTypeChange(tablet.Type, newType) || !topo.IsValidTypeChange(tablet.Type, newType) {
return fmt.Errorf("cannot change tablet type %v -> %v %v", tablet.Type, newType, tabletAlias)
}
if runHooks {
// Only run the preflight_serving_type hook when
// transitioning from non-serving to serving.
if !topo.IsInServingGraph(tablet.Type) && topo.IsInServingGraph(newType) {
if err := hook.NewSimpleHook("preflight_serving_type").ExecuteOptional(); err != nil {
return err
}
}
}
tablet.Type = newType
if newType == topo.TYPE_IDLE {
if tablet.Parent.IsZero() {
si, err := ts.GetShard(tablet.Keyspace, tablet.Shard)
if err != nil {
return err
}
rec := concurrency.AllErrorRecorder{}
wg := sync.WaitGroup{}
for _, cell := range si.Cells {
wg.Add(1)
go func(cell string) {
defer wg.Done()
sri, err := ts.GetShardReplication(cell, tablet.Keyspace, tablet.Shard)
if err != nil {
log.Warningf("Cannot check cell %v for extra replication paths, assuming it's good", cell)
return
}
for _, rl := range sri.ReplicationLinks {
if rl.Parent == tabletAlias {
rec.RecordError(fmt.Errorf("Still have a ReplicationLink in cell %v", cell))
}
}
}(cell)
}
wg.Wait()
if rec.HasErrors() {
return rec.Error()
}
}
tablet.Parent = topo.TabletAlias{}
tablet.Keyspace = ""
tablet.Shard = ""
tablet.KeyRange = key.KeyRange{}
tablet.Health = health
}
if health != nil {
if len(health) == 0 {
tablet.Health = nil
} else {
tablet.Health = health
}
}
return topo.UpdateTablet(context.TODO(), ts, tablet)
}
func CheckShardReplication(t *testing.T, ts topo.Server) {
cell := getLocalCell(t, ts)
if _, err := ts.GetShardReplication(cell, "test_keyspace", "-10"); err != topo.ErrNoNode {
t.Errorf("GetShardReplication(not there): %v", err)
}
sr := &topo.ShardReplication{
ReplicationLinks: []topo.ReplicationLink{
topo.ReplicationLink{
TabletAlias: topo.TabletAlias{
Cell: "c1",
Uid: 1,
},
Parent: topo.TabletAlias{
Cell: "c2",
Uid: 2,
},
},
},
}
if err := ts.UpdateShardReplicationFields(cell, "test_keyspace", "-10", func(oldSr *topo.ShardReplication) error {
*oldSr = *sr
return nil
}); err != nil {
t.Fatalf("UpdateShardReplicationFields() failed: %v", err)
}
if sri, err := ts.GetShardReplication(cell, "test_keyspace", "-10"); err != nil {
t.Errorf("GetShardReplication(new guy) failed: %v", err)
} else {
if len(sri.ReplicationLinks) != 1 ||
sri.ReplicationLinks[0].TabletAlias.Cell != "c1" ||
sri.ReplicationLinks[0].TabletAlias.Uid != 1 ||
sri.ReplicationLinks[0].Parent.Cell != "c2" ||
sri.ReplicationLinks[0].Parent.Uid != 2 {
t.Errorf("GetShardReplication(new guy) returned wrong value: %v", *sri)
}
}
if err := ts.UpdateShardReplicationFields(cell, "test_keyspace", "-10", func(sr *topo.ShardReplication) error {
sr.ReplicationLinks = append(sr.ReplicationLinks, topo.ReplicationLink{
TabletAlias: topo.TabletAlias{
Cell: "c3",
Uid: 3,
},
Parent: topo.TabletAlias{
Cell: "c4",
Uid: 4,
},
})
return nil
}); err != nil {
t.Errorf("UpdateShardReplicationFields() failed: %v", err)
}
if sri, err := ts.GetShardReplication(cell, "test_keyspace", "-10"); err != nil {
t.Errorf("GetShardReplication(after append) failed: %v", err)
} else {
if len(sri.ReplicationLinks) != 2 ||
sri.ReplicationLinks[0].TabletAlias.Cell != "c1" ||
sri.ReplicationLinks[0].TabletAlias.Uid != 1 ||
sri.ReplicationLinks[0].Parent.Cell != "c2" ||
sri.ReplicationLinks[0].Parent.Uid != 2 ||
sri.ReplicationLinks[1].TabletAlias.Cell != "c3" ||
sri.ReplicationLinks[1].TabletAlias.Uid != 3 ||
sri.ReplicationLinks[1].Parent.Cell != "c4" ||
sri.ReplicationLinks[1].Parent.Uid != 4 {
t.Errorf("GetShardReplication(new guy) returned wrong value: %v", *sri)
}
}
if err := ts.DeleteShardReplication(cell, "test_keyspace", "-10"); err != nil {
t.Errorf("DeleteShardReplication(existing) failed: %v", err)
}
if err := ts.DeleteShardReplication(cell, "test_keyspace", "-10"); err != topo.ErrNoNode {
t.Errorf("DeleteShardReplication(again) returned: %v", err)
}
}