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Topo splitter #4
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97a5a80
Skeleton for a 'Tee' topo.Server for migration purposes.
alainjobart 6cd304e
Merge branch 'master' of github.com:youtube/vitess into topo
alainjobart 00e5e39
Merge branch 'master' of github.com:youtube/vitess into topo
alainjobart 9fca690
Now the Tee supports most operations.
alainjobart 39d120b
Renaming a file.
alainjobart 8969356
Updated these files from Ric's feedback.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| // Copyright 2013, Google Inc. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| // topotools package contains a few utility classes to handle topo.Server | ||
| // objects, and transitions. | ||
| package topotools | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| "github.com/youtube/vitess/go/relog" | ||
| "github.com/youtube/vitess/go/vt/concurrency" | ||
| "github.com/youtube/vitess/go/vt/topo" | ||
| ) | ||
|
|
||
| // CopyKeyspaces will create the keyspaces in the destination topo | ||
| func CopyKeyspaces(fromTS, toTS topo.Server) { | ||
| keyspaces, err := fromTS.GetKeyspaces() | ||
| if err != nil { | ||
| relog.Fatal("fromTS.GetKeyspaces failed: %v", err) | ||
| } | ||
|
|
||
| wg := sync.WaitGroup{} | ||
| rec := concurrency.AllErrorRecorder{} | ||
| for _, keyspace := range keyspaces { | ||
| wg.Add(1) | ||
| go func(keyspace string) { | ||
| defer wg.Done() | ||
| if err := toTS.CreateKeyspace(keyspace); err != nil { | ||
| if err == topo.ErrNodeExists { | ||
| relog.Warning("keyspace %v already exists", keyspace) | ||
| } else { | ||
| rec.RecordError(err) | ||
| } | ||
| } | ||
| }(keyspace) | ||
| } | ||
| wg.Wait() | ||
| if rec.HasErrors() { | ||
| relog.Fatal("copyKeyspaces failed: %v", rec.Error()) | ||
| } | ||
| } | ||
|
|
||
| // CopyShards will create the keyspaces in the destination topo | ||
| func CopyShards(fromTS, toTS topo.Server, deleteKeyspaceShards bool) { | ||
| keyspaces, err := fromTS.GetKeyspaces() | ||
| if err != nil { | ||
| relog.Fatal("fromTS.GetKeyspaces failed: %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(err) | ||
| return | ||
| } | ||
|
|
||
| if deleteKeyspaceShards { | ||
| if err := toTS.DeleteKeyspaceShards(keyspace); err != nil { | ||
| rec.RecordError(err) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| for _, shard := range shards { | ||
| wg.Add(1) | ||
| go func(keyspace, shard string) { | ||
| defer wg.Done() | ||
| if err := toTS.CreateShard(keyspace, shard); err != nil { | ||
| if err == topo.ErrNodeExists { | ||
| relog.Warning("shard %v/%v already exists", keyspace, shard) | ||
| } else { | ||
| rec.RecordError(err) | ||
| } | ||
| } | ||
| }(keyspace, shard) | ||
| } | ||
| }(keyspace) | ||
| } | ||
| wg.Wait() | ||
| if rec.HasErrors() { | ||
| relog.Fatal("copyShards failed: %v", rec.Error()) | ||
| } | ||
| } | ||
|
|
||
| // CopyTablets will create the tablets in the destination topo | ||
| func CopyTablets(fromTS, toTS topo.Server) { | ||
| cells, err := fromTS.GetKnownCells() | ||
| if err != nil { | ||
| relog.Fatal("fromTS.GetKnownCells failed: %v", err) | ||
| } | ||
|
|
||
| wg := sync.WaitGroup{} | ||
| rec := concurrency.AllErrorRecorder{} | ||
| for _, cell := range cells { | ||
| wg.Add(1) | ||
| go func(cell string) { | ||
| defer wg.Done() | ||
| tabletAliases, err := fromTS.GetTabletsByCell(cell) | ||
| if err != nil { | ||
| rec.RecordError(err) | ||
| } else { | ||
| for _, tabletAlias := range tabletAliases { | ||
| wg.Add(1) | ||
| go func(tabletAlias topo.TabletAlias) { | ||
| defer wg.Done() | ||
|
|
||
| // read the source tablet | ||
| ti, err := fromTS.GetTablet(tabletAlias) | ||
| if err != nil { | ||
| rec.RecordError(err) | ||
| return | ||
| } | ||
|
|
||
| // try to create the destination | ||
| err = toTS.CreateTablet(ti.Tablet) | ||
| if err == topo.ErrNodeExists { | ||
| // update the destination tablet | ||
| _, err = toTS.UpdateTablet(ti, -1) | ||
|
|
||
| } | ||
| if err != nil { | ||
| rec.RecordError(err) | ||
| return | ||
| } | ||
|
|
||
| // create the replication paths | ||
| // for masters only here | ||
| if ti.Type == topo.TYPE_MASTER { | ||
| if err = toTS.CreateReplicationPath(ti.Keyspace, ti.Shard, ti.Alias().String()); err != nil && err != topo.ErrNodeExists { | ||
| rec.RecordError(err) | ||
| } | ||
| } | ||
| }(tabletAlias) | ||
| } | ||
| } | ||
| }(cell) | ||
| } | ||
| wg.Wait() | ||
| if rec.HasErrors() { | ||
| relog.Fatal("copyTablets failed: %v", rec.Error()) | ||
| } | ||
| } | ||
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Write a one line explanation of what topotools does.