本文整理匯總了Golang中github.com/henryanand/vitess/go/vt/topo.ShardInfo.SourceShards方法的典型用法代碼示例。如果您正苦於以下問題：Golang ShardInfo.SourceShards方法的具體用法？Golang ShardInfo.SourceShards怎麽用？Golang ShardInfo.SourceShards使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/henryanand/vitess/go/vt/topo.ShardInfo的用法示例。
在下文中一共展示了ShardInfo.SourceShards方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: masterMigrateServedFrom
// masterMigrateServedFrom handles the master migration. The ordering is
// a bit different than for rdonly / replica to guarantee a smooth transition.
//
// The order is as follows:
// - Add BlacklistedTables on the source shard map for master
// - Refresh the source master, so it stops writing on the tables
// - Get the source master position, wait until destination master reaches it
// - Clear SourceShard on the destination Shard
// - Refresh the destination master, so its stops its filtered
// replication and starts accepting writes
func (wr *Wrangler) masterMigrateServedFrom(ki *topo.KeyspaceInfo, sourceShard *topo.ShardInfo, destinationShard *topo.ShardInfo, tables []string, ev *events.MigrateServedFrom) error {
// Read the data we need
sourceMasterTabletInfo, err := wr.ts.GetTablet(sourceShard.MasterAlias)
if err != nil {
return err
}
destinationMasterTabletInfo, err := wr.ts.GetTablet(destinationShard.MasterAlias)
if err != nil {
return err
}
// Update source shard (more blacklisted tables)
event.DispatchUpdate(ev, "updating source shard")
if err := sourceShard.UpdateSourceBlacklistedTables(topo.TYPE_MASTER, nil, false, tables); err != nil {
return fmt.Errorf("UpdateSourceBlacklistedTables(%v/%v) failed: %v", sourceShard.Keyspace(), sourceShard.ShardName(), err)
}
if err := topo.UpdateShard(context.TODO(), wr.ts, sourceShard); err != nil {
return fmt.Errorf("UpdateShard(%v/%v) failed: %v", sourceShard.Keyspace(), sourceShard.ShardName(), err)
}
// Now refresh the blacklisted table list on the source master
event.DispatchUpdate(ev, "refreshing source master so it updates its blacklisted tables")
if err := wr.tmc.RefreshState(wr.ctx, sourceMasterTabletInfo); err != nil {
return err
}
// get the position
event.DispatchUpdate(ev, "getting master position")
masterPosition, err := wr.tmc.MasterPosition(wr.ctx, sourceMasterTabletInfo)
if err != nil {
return err
}
// wait for it
event.DispatchUpdate(ev, "waiting for destination master to catch up to source master")
if err := wr.tmc.WaitBlpPosition(context.TODO(), destinationMasterTabletInfo, blproto.BlpPosition{
Uid: 0,
Position: masterPosition,
}, wr.ActionTimeout()); err != nil {
return err
}
// Update the destination keyspace (its ServedFrom has changed)
event.DispatchUpdate(ev, "updating keyspace")
if err = topo.UpdateKeyspace(wr.ts, ki); err != nil {
return err
}
// Update the destination shard (no more source shard)
event.DispatchUpdate(ev, "updating destination shard")
destinationShard.SourceShards = nil
if err := topo.UpdateShard(context.TODO(), wr.ts, destinationShard); err != nil {
return err
}
// Tell the new shards masters they can now be read-write.
// Invoking a remote action will also make the tablet stop filtered
// replication.
event.DispatchUpdate(ev, "setting destination shard masters read-write")
if err := wr.refreshMasters([]*topo.ShardInfo{destinationShard}); err != nil {
return err
}
return nil
}