Golang Tablet.Alias方法代码示例

// RefreshMap reads the right data from topo.Server and makes sure
// we're playing the right logs
func (blm *BinlogPlayerMap) RefreshMap(tablet topo.Tablet) {
	log.Infof("Refreshing map of binlog players")

	// read the shard to get SourceShards
	shardInfo, err := blm.ts.GetShard(tablet.Keyspace, tablet.Shard)
	if err != nil {
		log.Errorf("Cannot read shard for this tablet: %v", tablet.Alias())
		return
	}

	// get the existing sources and build a map of sources to remove
	toRemove := make(map[topo.SourceShard]bool)
	for source, _ := range blm.players {
		toRemove[source] = true
	}

	// for each source, add it if not there, and delete from toRemove
	for _, source := range shardInfo.SourceShards {
		blm.AddPlayer(tablet.Keyspace, source)
		delete(toRemove, source)
	}

	// remove all entries from toRemove
	for source, _ := range toRemove {
		blm.players[source].Stop()
		delete(blm.players, source)
	}
}

func (zkts *Server) CreateTablet(tablet *topo.Tablet) error {
	zkTabletPath := TabletPathForAlias(tablet.Alias())

	// Create /zk/<cell>/vt/tablets/<uid>
	_, err := zk.CreateRecursive(zkts.zconn, zkTabletPath, tablet.Json(), 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
	if err != nil {
		if zookeeper.IsError(err, zookeeper.ZNODEEXISTS) {
			err = topo.ErrNodeExists
		}
		return err
	}

	// Create /zk/<cell>/vt/tablets/<uid>/action
	tap := path.Join(zkTabletPath, "action")
	_, err = zkts.zconn.Create(tap, "", 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
	if err != nil {
		return err
	}

	// Create /zk/<cell>/vt/tablets/<uid>/actionlog
	talp := path.Join(zkTabletPath, "actionlog")
	_, err = zkts.zconn.Create(talp, "", 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
	if err != nil {
		return err
	}

	return nil
}

func (tee *Tee) CreateTablet(tablet *topo.Tablet) error {
	err := tee.primary.CreateTablet(tablet)
	if err != nil && err != topo.ErrNodeExists {
		return err
	}

	if err := tee.primary.CreateTablet(tablet); err != nil && err != topo.ErrNodeExists {
		// not critical enough to fail
		relog.Warning("secondary.CreateTablet(%v) failed: %v", tablet.Alias(), err)
	}
	return err
}

// RefreshMap reads the right data from topo.Server and makes sure
// we're playing the right logs
func (blm *BinlogPlayerMap) RefreshMap(tablet topo.Tablet) {
	log.Infof("Refreshing map of binlog players")

	// read the shard to get SourceShards
	shardInfo, err := blm.ts.GetShard(tablet.Keyspace, tablet.Shard)
	if err != nil {
		log.Errorf("Cannot read shard for this tablet: %v", tablet.Alias())
		return
	}

	blm.mu.Lock()

	// get the existing sources and build a map of sources to remove
	toRemove := make(map[topo.SourceShard]bool)
	hadPlayers := false
	for source, _ := range blm.players {
		toRemove[source] = true
		hadPlayers = true
	}

	// for each source, add it if not there, and delete from toRemove
	for _, sourceShard := range shardInfo.SourceShards {
		blm.addPlayer(tablet.Cell, tablet.KeyRange, sourceShard)
		delete(toRemove, sourceShard)
	}
	hasPlayers := len(shardInfo.SourceShards) > 0

	// remove all entries from toRemove
	for source, _ := range toRemove {
		blm.players[source].Stop()
		delete(blm.players, source)
	}

	blm.mu.Unlock()

	if hadPlayers && !hasPlayers {
		blm.EnableSuperToSetTimestamp()
	}
}

// InitTablet creates or updates a tablet. If no parent is specified
// in the tablet, and the tablet has a slave type, we will find the
// appropriate parent. If createShardAndKeyspace is true and the
// parent keyspace or shard don't exist, they will be created.  If
// update is true, and a tablet with the same ID exists, update it.
// If Force is true, and a tablet with the same ID already exists, it
// will be scrapped and deleted, and then recreated.
func (wr *Wrangler) InitTablet(tablet *topo.Tablet, force, createShardAndKeyspace, update bool) error {
	if err := tablet.Complete(); err != nil {
		return err
	}

	if tablet.IsInReplicationGraph() {
		// create the parent keyspace and shard if needed
		if createShardAndKeyspace {
			if err := wr.ts.CreateKeyspace(tablet.Keyspace); err != nil && err != topo.ErrNodeExists {
				return err
			}

			if err := topo.CreateShard(wr.ts, tablet.Keyspace, tablet.Shard); err != nil && err != topo.ErrNodeExists {
				return err
			}
		}

		// get the shard, checks a couple things
		si, err := wr.ts.GetShard(tablet.Keyspace, tablet.Shard)
		if err != nil {
			return fmt.Errorf("missing parent shard, use -parent option to create it, or CreateKeyspace / CreateShard")
		}
		if si.KeyRange != tablet.KeyRange {
			return fmt.Errorf("shard %v/%v has a different KeyRange: %v != %v", tablet.Keyspace, tablet.Shard, si.KeyRange, tablet.KeyRange)
		}
		if tablet.Type == topo.TYPE_MASTER && !si.MasterAlias.IsZero() && si.MasterAlias != tablet.Alias() && !force {
			return fmt.Errorf("creating this tablet would override old master %v in shard %v/%v", si.MasterAlias, tablet.Keyspace, tablet.Shard)
		}

		// see if we specified a parent, otherwise get it from the shard
		if tablet.Parent.IsZero() && tablet.Type.IsSlaveType() {
			if si.MasterAlias.IsZero() {
				return fmt.Errorf("trying to create tablet %v in shard %v/%v without a master", tablet.Alias(), tablet.Keyspace, tablet.Shard)
			}
			tablet.Parent = si.MasterAlias
		}

		// See if we need to update the Shard:
		// - add the tablet's cell to the shard's Cells if needed
		// - change the master if needed
		shardUpdateRequired := false
		if !si.HasCell(tablet.Cell) {
			shardUpdateRequired = true
		}
		if tablet.Type == topo.TYPE_MASTER && si.MasterAlias != tablet.Alias() {
			shardUpdateRequired = true
		}

		if shardUpdateRequired {
			actionNode := wr.ai.UpdateShard()
			lockPath, err := wr.lockShard(tablet.Keyspace, tablet.Shard, actionNode)
			if err != nil {
				return err
			}

			// re-read the shard with the lock
			si, err = wr.ts.GetShard(tablet.Keyspace, tablet.Shard)
			if err != nil {
				return wr.unlockShard(tablet.Keyspace, tablet.Shard, actionNode, lockPath, err)
			}

			// update it
			wasUpdated := false
			if !si.HasCell(tablet.Cell) {
				si.Cells = append(si.Cells, tablet.Cell)
				wasUpdated = true
			}
			if tablet.Type == topo.TYPE_MASTER && si.MasterAlias != tablet.Alias() {
				if !si.MasterAlias.IsZero() && !force {
					return wr.unlockShard(tablet.Keyspace, tablet.Shard, actionNode, lockPath, fmt.Errorf("creating this tablet would override old master %v in shard %v/%v", si.MasterAlias, tablet.Keyspace, tablet.Shard))
				}
				si.MasterAlias = tablet.Alias()
				wasUpdated = true
			}

			if wasUpdated {
				// write it back
				if err := wr.ts.UpdateShard(si); err != nil {
					return wr.unlockShard(tablet.Keyspace, tablet.Shard, actionNode, lockPath, err)
				}
			}

			// and unlock
			if err := wr.unlockShard(tablet.Keyspace, tablet.Shard, actionNode, lockPath, err); err != nil {
				return err
			}

			// also create the cell's ShardReplication
			if err := wr.ts.CreateShardReplication(tablet.Cell, tablet.Keyspace, tablet.Shard, &topo.ShardReplication{}); err != nil && err != topo.ErrNodeExists {
				return err
			}
		}
	}
//.........这里部分代码省略.........

// InitTablet creates or updates a tablet. If no parent is specified
// in the tablet, and the tablet has a slave type, we will find the
// appropriate parent. If createShardAndKeyspace is true and the
// parent keyspace or shard don't exist, they will be created.  If
// update is true, and a tablet with the same ID exists, update it.
// If Force is true, and a tablet with the same ID already exists, it
// will be scrapped and deleted, and then recreated.
func (wr *Wrangler) InitTablet(tablet *topo.Tablet, force, createShardAndKeyspace, update bool) error {
	if err := tablet.Complete(); err != nil {
		return err
	}
	if tablet.Parent.IsZero() && tablet.Type.IsSlaveType() {
		parentAlias, err := wr.getMasterAlias(tablet.Keyspace, tablet.Shard)
		if err != nil {
			return err
		}
		tablet.Parent = parentAlias
	}

	if tablet.IsInReplicationGraph() {
		// create the parent keyspace and shard if needed
		if createShardAndKeyspace {
			if err := wr.ts.CreateKeyspace(tablet.Keyspace); err != nil && err != topo.ErrNodeExists {
				return err
			}

			if err := topo.CreateShard(wr.ts, tablet.Keyspace, tablet.Shard); err != nil && err != topo.ErrNodeExists {
				return err
			}
		}

		// get the shard, checks KeyRange is the same
		si, err := wr.ts.GetShard(tablet.Keyspace, tablet.Shard)
		if err != nil {
			return fmt.Errorf("Missing parent shard, use -parent option to create it, or CreateKeyspace / CreateShard")
		}
		if si.KeyRange != tablet.KeyRange {
			return fmt.Errorf("Shard %v/%v has a different KeyRange: %v != %v", tablet.Keyspace, tablet.Shard, si.KeyRange, tablet.KeyRange)
		}
	}

	err := topo.CreateTablet(wr.ts, tablet)
	if err != nil && err == topo.ErrNodeExists {
		// Try to update nicely, but if it fails fall back to force behavior.
		if update {
			oldTablet, err := wr.ts.GetTablet(tablet.Alias())
			if err != nil {
				relog.Warning("failed reading tablet %v: %v", tablet.Alias(), err)
			} else {
				if oldTablet.Keyspace == tablet.Keyspace && oldTablet.Shard == tablet.Shard {
					*(oldTablet.Tablet) = *tablet
					err := topo.UpdateTablet(wr.ts, oldTablet)
					if err != nil {
						relog.Warning("failed updating tablet %v: %v", tablet.Alias(), err)
					} else {
						return nil
					}
				}
			}
		}
		if force {
			if _, err = wr.Scrap(tablet.Alias(), force, false); err != nil {
				relog.Error("failed scrapping tablet %v: %v", tablet.Alias(), err)
				return err
			}
			if err := wr.ts.DeleteTablet(tablet.Alias()); err != nil {
				// we ignore this
				relog.Error("failed deleting tablet %v: %v", tablet.Alias(), err)
			}
			return topo.CreateTablet(wr.ts, tablet)
		}
	}
	return err
}

// InitTablet creates or updates a tablet. If no parent is specified
// in the tablet, and the tablet has a slave type, we will find the
// appropriate parent. If createShardAndKeyspace is true and the
// parent keyspace or shard don't exist, they will be created.  If
// update is true, and a tablet with the same ID exists, update it.
// If Force is true, and a tablet with the same ID already exists, it
// will be scrapped and deleted, and then recreated.
func (wr *Wrangler) InitTablet(tablet *topo.Tablet, force, createShardAndKeyspace, update bool) error {
	if err := tablet.Complete(); err != nil {
		return err
	}
	if tablet.Parent.IsZero() && tablet.Type.IsSlaveType() {
		parentAlias, err := wr.getMasterAlias(tablet.Keyspace, tablet.Shard)
		if err != nil {
			return err
		}
		tablet.Parent = parentAlias
	}

	if tablet.IsInReplicationGraph() {
		// create the parent keyspace and shard if needed
		if createShardAndKeyspace {
			if err := wr.ts.CreateKeyspace(tablet.Keyspace); err != nil && err != topo.ErrNodeExists {
				return err
			}

			if err := topo.CreateShard(wr.ts, tablet.Keyspace, tablet.Shard); err != nil && err != topo.ErrNodeExists {
				return err
			}
		}

		// get the shard, checks KeyRange is the same
		si, err := wr.ts.GetShard(tablet.Keyspace, tablet.Shard)
		if err != nil {
			return fmt.Errorf("Missing parent shard, use -parent option to create it, or CreateKeyspace / CreateShard")
		}
		if si.KeyRange != tablet.KeyRange {
			return fmt.Errorf("Shard %v/%v has a different KeyRange: %v != %v", tablet.Keyspace, tablet.Shard, si.KeyRange, tablet.KeyRange)
		}

		// add the tablet's cell to the shard cell if needed
		if !si.HasCell(tablet.Cell) {
			actionNode := wr.ai.UpdateShard()
			lockPath, err := wr.lockShard(tablet.Keyspace, tablet.Shard, actionNode)
			if err != nil {
				return err
			}

			// re-read the shard with the lock
			si, err = wr.ts.GetShard(tablet.Keyspace, tablet.Shard)
			if err != nil {
				return wr.unlockShard(tablet.Keyspace, tablet.Shard, actionNode, lockPath, err)
			}

			// update it
			if !si.HasCell(tablet.Cell) {
				si.Cells = append(si.Cells, tablet.Cell)

				// write it back
				if err := wr.ts.UpdateShard(si); err != nil {
					return wr.unlockShard(tablet.Keyspace, tablet.Shard, actionNode, lockPath, err)
				}
			}

			// and unlock
			if err := wr.unlockShard(tablet.Keyspace, tablet.Shard, actionNode, lockPath, err); err != nil {
				return err
			}

			// also create the cell's ShardReplication
			if err := wr.ts.CreateShardReplication(tablet.Cell, tablet.Keyspace, tablet.Shard, &topo.ShardReplication{}); err != nil && err != topo.ErrNodeExists {
				return err
			}
		}
	}

	err := topo.CreateTablet(wr.ts, tablet)
	if err != nil && err == topo.ErrNodeExists {
		// Try to update nicely, but if it fails fall back to force behavior.
		if update {
			oldTablet, err := wr.ts.GetTablet(tablet.Alias())
			if err != nil {
				log.Warningf("failed reading tablet %v: %v", tablet.Alias(), err)
			} else {
				if oldTablet.Keyspace == tablet.Keyspace && oldTablet.Shard == tablet.Shard {
					*(oldTablet.Tablet) = *tablet
					err := topo.UpdateTablet(wr.ts, oldTablet)
					if err != nil {
						log.Warningf("failed updating tablet %v: %v", tablet.Alias(), err)
					} else {
						return nil
					}
				}
			}
		}
		if force {
			if _, err = wr.Scrap(tablet.Alias(), force, false); err != nil {
				log.Errorf("failed scrapping tablet %v: %v", tablet.Alias(), err)
				return err
			}
//.........这里部分代码省略.........