// TabletExternallyReparented updates all topo records so the current
// tablet is the new master for this shard. It is called by the RPC
// server.
func TabletExternallyReparented(ts topo.Server, tabletAlias topo.TabletAlias, actionTimeout, lockTimeout time.Duration) error {
// we're apprently not the master yet, so let's do the work
tablet, err := ts.GetTablet(tabletAlias)
if err != nil {
return err
}
// fast quick check on the shard
shardInfo, err := ts.GetShard(tablet.Keyspace, tablet.Shard)
if err != nil {
return err
}
if shardInfo.MasterAlias == tabletAlias {
return nil
}
// grab the shard lock
actionNode := actionnode.ShardExternallyReparented(tabletAlias)
interrupted := make(chan struct{})
lockPath, err := actionNode.LockShard(ts, tablet.Keyspace, tablet.Shard, lockTimeout, interrupted)
if err != nil {
return err
}
// do the work
err = tabletExternallyReparentedLocked(ts, tablet, actionTimeout, lockTimeout, interrupted)
// release the lock in any case
return actionNode.UnlockShard(ts, tablet.Keyspace, tablet.Shard, lockPath, err)
}
func (wr *Wrangler) ShardExternallyReparented(keyspace, shard string, masterElectTabletAlias topo.TabletAlias) error {
// grab the shard lock
actionNode := actionnode.ShardExternallyReparented(masterElectTabletAlias)
lockPath, err := wr.lockShard(keyspace, shard, actionNode)
if err != nil {
return err
}
// do the work
err = wr.shardExternallyReparentedLocked(keyspace, shard, masterElectTabletAlias)
// release the lock in any case
return wr.unlockShard(keyspace, shard, actionNode, lockPath, err)
}
func (wr *Wrangler) ShardExternallyReparented(keyspace, shard string, masterElectTabletAlias topo.TabletAlias, scrapStragglers, continueOnUnexpectedMaster bool, acceptSuccessPercents int) error {
// grab the shard lock
actionNode := actionnode.ShardExternallyReparented(masterElectTabletAlias)
lockPath, err := wr.lockShard(keyspace, shard, actionNode)
if err != nil {
return err
}
// do the work
err = wr.shardExternallyReparentedLocked(keyspace, shard, masterElectTabletAlias, scrapStragglers, continueOnUnexpectedMaster, acceptSuccessPercents)
// release the lock in any case
return wr.unlockShard(keyspace, shard, actionNode, lockPath, err)
}
// TabletExternallyReparented updates all topo records so the current
// tablet is the new master for this shard.
// Should be called under RpcWrapLock.
func (agent *ActionAgent) TabletExternallyReparented(actionTimeout time.Duration) error {
tablet := agent.Tablet()
// fast quick check on the shard to see if we're not the master already
shardInfo, err := agent.TopoServer.GetShard(tablet.Keyspace, tablet.Shard)
if err != nil {
log.Warningf("TabletExternallyReparented: Cannot read the shard %v/%v: %v", tablet.Keyspace, tablet.Shard, err)
return err
}
if shardInfo.MasterAlias == agent.TabletAlias {
// we are already the master, nothing more to do.
return nil
}
// grab the shard lock
actionNode := actionnode.ShardExternallyReparented(agent.TabletAlias)
interrupted := make(chan struct{})
lockPath, err := actionNode.LockShard(agent.TopoServer, tablet.Keyspace, tablet.Shard, agent.LockTimeout, interrupted)
if err != nil {
log.Warningf("TabletExternallyReparented: Cannot lock shard %v/%v: %v", tablet.Keyspace, tablet.Shard, err)
return err
}
// do the work
runAfterAction, err := agent.tabletExternallyReparentedLocked(actionTimeout, interrupted)
if err != nil {
log.Warningf("TabletExternallyReparented: internal error: %v", err)
}
// release the lock in any case, and run refreshTablet if necessary
err = actionNode.UnlockShard(agent.TopoServer, tablet.Keyspace, tablet.Shard, lockPath, err)
if runAfterAction {
if refreshErr := agent.refreshTablet("RPC(TabletExternallyReparented)"); refreshErr != nil {
if err == nil {
// no error yet, now we have one
err = refreshErr
} else {
//have an error already, keep the original one
log.Warningf("refreshTablet failed with error: %v", refreshErr)
}
}
}
return err
}