Golang TabletInfo.Alias方法代碼示例

func (wr *Wrangler) restartSlavesExternal(slaveTabletMap map[topo.TabletAlias]*topo.TabletInfo, masterTablet, masterElectTablet *topo.TabletInfo, scrapStragglers bool) error {
	recorder := concurrency.AllErrorRecorder{}
	wg := sync.WaitGroup{}

	swrd := tm.SlaveWasRestartedData{
		Parent:               masterElectTablet.Alias(),
		ExpectedMasterAddr:   masterElectTablet.MysqlAddr,
		ExpectedMasterIpAddr: masterElectTablet.MysqlIpAddr,
		ScrapStragglers:      scrapStragglers,
	}

	// do all the slaves
	for _, ti := range slaveTabletMap {
		wg.Add(1)
		go func(ti *topo.TabletInfo) {
			recorder.RecordError(wr.slaveWasRestarted(ti, &swrd))
			wg.Done()
		}(ti)
	}
	wg.Wait()

	// then do the master
	recorder.RecordError(wr.slaveWasRestarted(masterTablet, &swrd))
	return recorder.Error()
}

func (wr *Wrangler) SnapshotSourceEnd(tabletAlias topo.TabletAlias, slaveStartRequired, readWrite bool, originalType topo.TabletType) (err error) {
	var ti *topo.TabletInfo
	ti, err = wr.ts.GetTablet(tabletAlias)
	if err != nil {
		return
	}

	var actionPath string
	actionPath, err = wr.ai.SnapshotSourceEnd(tabletAlias, &tm.SnapshotSourceEndArgs{slaveStartRequired, !readWrite})
	if err != nil {
		return
	}

	// wait for completion, and save the error
	err = wr.ai.WaitForCompletion(actionPath, wr.actionTimeout())
	if err != nil {
		log.Errorf("SnapshotSourceEnd failed (%v), leaving tablet type alone", err)
		return
	}

	if ti.Tablet.Parent.Uid == topo.NO_TABLET {
		ti.Tablet.Type = topo.TYPE_MASTER
		err = topo.UpdateTablet(wr.ts, ti)
	} else {
		err = wr.ChangeType(ti.Alias(), originalType, false)
	}

	return err
}

func (wr *Wrangler) slaveWasRestarted(ti *topo.TabletInfo, swrd *tm.SlaveWasRestartedData) (err error) {
	log.Infof("slaveWasRestarted(%v)", ti.Alias())
	actionPath, err := wr.ai.SlaveWasRestarted(ti.Alias(), swrd)
	if err != nil {
		return err
	}
	return wr.ai.WaitForCompletion(actionPath, wr.actionTimeout())
}

func (wr *Wrangler) restartSlave(ti *topo.TabletInfo, rsd *tm.RestartSlaveData) (err error) {
	log.Infof("restart slave %v", ti.Alias())
	actionPath, err := wr.ai.RestartSlave(ti.Alias(), rsd)
	if err != nil {
		return err
	}
	return wr.ai.WaitForCompletion(actionPath, wr.actionTimeout())
}

func (wr *Wrangler) getMasterPosition(ti *topo.TabletInfo) (*mysqlctl.ReplicationPosition, error) {
	actionPath, err := wr.ai.MasterPosition(ti.Alias())
	if err != nil {
		return nil, err
	}
	result, err := wr.ai.WaitForCompletionReply(actionPath, wr.actionTimeout())
	if err != nil {
		return nil, err
	}
	return result.(*mysqlctl.ReplicationPosition), nil
}

func (tee *Tee) UpdateTablet(tablet *topo.TabletInfo, existingVersion int) (newVersion int, err error) {
	if newVersion, err = tee.primary.UpdateTablet(tablet, existingVersion); err != nil {
		// failed on primary, not updating secondary
		return
	}

	if _, err := tee.secondary.UpdateTablet(tablet, existingVersion); err != nil {
		// not critical enough to fail
		relog.Warning("secondary.UpdateTablet(%v) failed: %v", tablet.Alias(), err)
	}
	return
}

func (wr *Wrangler) slaveWasPromoted(ti *topo.TabletInfo) error {
	log.Infof("slave was promoted %v", ti.Alias())
	actionPath, err := wr.ai.SlaveWasPromoted(ti.Alias())
	if err != nil {
		return err
	}
	err = wr.ai.WaitForCompletion(actionPath, wr.actionTimeout())
	if err != nil {
		return err
	}
	return nil
}

func (wr *Wrangler) demoteMaster(ti *topo.TabletInfo) (*mysqlctl.ReplicationPosition, error) {
	log.Infof("demote master %v", ti.Alias())
	actionPath, err := wr.ai.DemoteMaster(ti.Alias())
	if err != nil {
		return nil, err
	}
	err = wr.ai.WaitForCompletion(actionPath, wr.actionTimeout())
	if err != nil {
		return nil, err
	}
	return wr.getMasterPosition(ti)
}

func (wr *Wrangler) promoteSlave(ti *topo.TabletInfo) (rsd *tm.RestartSlaveData, err error) {
	log.Infof("promote slave %v", ti.Alias())
	actionPath, err := wr.ai.PromoteSlave(ti.Alias())
	if err != nil {
		return
	}
	result, err := wr.ai.WaitForCompletionReply(actionPath, wr.actionTimeout())
	if err != nil {
		return
	}
	rsd = result.(*tm.RestartSlaveData)
	return
}

func (wr *Wrangler) ExecuteTabletInfoHook(ti *topo.TabletInfo, hook *hk.Hook) (hookResult *hk.HookResult, err error) {

	actionPath, err := wr.ai.ExecuteHook(ti.Alias(), hook)
	if err != nil {
		return nil, err
	}

	var hr interface{}
	if hr, err = wr.ai.WaitForCompletionReply(actionPath, 10*time.Minute); err != nil {
		return nil, err
	}
	return hr.(*hk.HookResult), nil
}

func (zkts *Server) UpdateTablet(tablet *topo.TabletInfo, existingVersion int) (int, error) {
	zkTabletPath := TabletPathForAlias(tablet.Alias())
	stat, err := zkts.zconn.Set(zkTabletPath, tablet.Json(), existingVersion)
	if err != nil {
		if zookeeper.IsError(err, zookeeper.ZBADVERSION) {
			err = topo.ErrBadVersion
		} else if zookeeper.IsError(err, zookeeper.ZNONODE) {
			err = topo.ErrNoNode
		}

		return 0, err
	}
	return stat.Version(), nil
}

func (wr *Wrangler) reparentShardExternal(slaveTabletMap, masterTabletMap map[topo.TabletAlias]*topo.TabletInfo, masterElectTablet *topo.TabletInfo, scrapStragglers bool, acceptSuccessPercents int) error {
	// we fix the new master in the replication graph
	err := wr.slaveWasPromoted(masterElectTablet)
	if err != nil {
		// This suggests that the master-elect is dead. This is bad.
		return fmt.Errorf("slaveWasPromoted(%v) failed: %v", masterElectTablet, err)
	}

	// Once the slave is promoted, remove it from our maps
	delete(slaveTabletMap, masterElectTablet.Alias())
	delete(masterTabletMap, masterElectTablet.Alias())

	// then fix all the slaves, including the old master
	return wr.restartSlavesExternal(slaveTabletMap, masterTabletMap, masterElectTablet, scrapStragglers, acceptSuccessPercents)
}

// Execute a hook and returns an error only if the hook failed, not if
// the hook doesn't exist.
func (wr *Wrangler) ExecuteOptionalTabletInfoHook(ti *topo.TabletInfo, hook *hk.Hook) (err error) {
	hr, err := wr.ExecuteTabletInfoHook(ti, hook)
	if err != nil {
		return err
	}

	if hr.ExitStatus == hk.HOOK_DOES_NOT_EXIST {
		log.Infof("Hook %v doesn't exist on tablet %v", hook.Name, ti.Alias())
		return nil
	}

	if hr.ExitStatus != hk.HOOK_SUCCESS {
		return fmt.Errorf("Hook %v failed(%v): %v", hook.Name, hr.ExitStatus, hr.Stderr)
	}

	return nil
}

func (wr *Wrangler) finishReparent(si *topo.ShardInfo, masterElect *topo.TabletInfo, majorityRestart, leaveMasterReadOnly bool) error {
	// If the majority of slaves restarted, move ahead.
	if majorityRestart {
		if leaveMasterReadOnly {
			log.Warningf("leaving master-elect read-only, change with: vtctl SetReadWrite %v", masterElect.Alias())
		} else {
			log.Infof("marking master-elect read-write %v", masterElect.Alias())
			actionPath, err := wr.ai.SetReadWrite(masterElect.Alias())
			if err == nil {
				err = wr.ai.WaitForCompletion(actionPath, wr.actionTimeout())
			}
			if err != nil {
				log.Warningf("master master-elect read-write failed, leaving master-elect read-only, change with: vtctl SetReadWrite %v", masterElect.Alias())
			}
		}
	} else {
		log.Warningf("minority reparent, manual fixes are needed, leaving master-elect read-only, change with: vtctl SetReadWrite %v", masterElect.Alias())
	}

	// save the new master in the shard info
	si.MasterAlias = masterElect.Alias()
	if err := wr.ts.UpdateShard(si); err != nil {
		log.Errorf("Failed to save new master into shard: %v", err)
		return err
	}

	// We rebuild all the cells, as we may have taken tablets in and
	// out of the graph.
	log.Infof("rebuilding shard serving graph data")
	return wr.rebuildShard(masterElect.Keyspace, masterElect.Shard, nil)
}

func (wr *Wrangler) reparentShardExternal(slaveTabletMap map[topo.TabletAlias]*topo.TabletInfo, masterTablet, masterElectTablet *topo.TabletInfo, scrapStragglers bool, acceptSuccessPercents int) error {

	// we fix the new master in the replication graph
	err := wr.slaveWasPromoted(masterElectTablet)
	if err != nil {
		// This suggests that the master-elect is dead. This is bad.
		return fmt.Errorf("slaveWasPromoted(%v) failed: %v", masterElectTablet, err)
	}

	// Once the slave is promoted, remove it from our map
	delete(slaveTabletMap, masterElectTablet.Alias())

	// then fix all the slaves, including the old master
	err = wr.restartSlavesExternal(slaveTabletMap, masterTablet, masterElectTablet, scrapStragglers, acceptSuccessPercents)
	if err != nil {
		return err
	}

	// and rebuild the shard graph.  We rebuild all the cells, as
	// we may have taken tablets in and out of the graph.
	log.Infof("rebuilding shard serving graph data")
	return wr.rebuildShard(masterElectTablet.Keyspace, masterElectTablet.Shard, nil)
}