// 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, &topo.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 } // update the shard record if needed if err := wr.updateShardCellsAndMaster(si, tablet.Alias, tablet.Type, force); err != nil { 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 || force { oldTablet, err := wr.ts.GetTablet(tablet.Alias) if err != nil { wr.Logger().Warningf("failed reading tablet %v: %v", tablet.Alias, err) } else { if oldTablet.Keyspace == tablet.Keyspace && oldTablet.Shard == tablet.Shard { *(oldTablet.Tablet) = *tablet if err := topo.UpdateTablet(context.TODO(), wr.ts, oldTablet); err != nil { wr.Logger().Warningf("failed updating tablet %v: %v", tablet.Alias, err) // now fall through the Scrap case } else { if !tablet.IsInReplicationGraph() { return nil } if err := topo.UpdateTabletReplicationData(context.TODO(), wr.ts, tablet); err != nil { wr.Logger().Warningf("failed updating tablet replication data for %v: %v", tablet.Alias, err) // now fall through the Scrap case } else { return nil } } } } } if force { if err = wr.Scrap(tablet.Alias, force, false); err != nil { wr.Logger().Errorf("failed scrapping tablet %v: %v", tablet.Alias, err) return err } if err := wr.ts.DeleteTablet(tablet.Alias); err != nil { // we ignore this wr.Logger().Errorf("failed deleting tablet %v: %v", tablet.Alias, err) } return topo.CreateTablet(wr.ts, tablet) } } return err }