Exemplo n.º 1
0
// Change the type of tablet and recompute all necessary derived paths in the
// serving graph.
// force: Bypass the vtaction system and make the data change directly, and
// do not run the remote hooks.
//
// Note we don't update the master record in the Shard here, as we can't
// ChangeType from and out of master anyway.
func (wr *Wrangler) ChangeType(tabletAlias topo.TabletAlias, dbType topo.TabletType, force bool) error {
	// Load tablet to find keyspace and shard assignment.
	// Don't load after the ChangeType which might have unassigned
	// the tablet.
	ti, err := wr.ts.GetTablet(tabletAlias)
	if err != nil {
		return err
	}
	rebuildRequired := ti.Tablet.IsServingType()

	if force {
		// with --force, we do not run any hook
		err = tm.ChangeType(wr.ts, tabletAlias, dbType, false)
	} else {
		// the remote action will run the hooks
		var actionPath string
		actionPath, err = wr.ai.ChangeType(tabletAlias, dbType)
		// You don't have a choice - you must wait for
		// completion before rebuilding.
		if err == nil {
			err = wr.ai.WaitForCompletion(actionPath, wr.actionTimeout())
		}
	}

	if err != nil {
		return err
	}

	// we rebuild if the tablet was serving, or if it is now
	var keyspaceToRebuild string
	var shardToRebuild string
	var cellToRebuild string
	if rebuildRequired {
		keyspaceToRebuild = ti.Keyspace
		shardToRebuild = ti.Shard
		cellToRebuild = ti.Cell
	} else {
		// re-read the tablet, see if we become serving
		ti, err := wr.ts.GetTablet(tabletAlias)
		if err != nil {
			return err
		}
		if ti.Tablet.IsServingType() {
			rebuildRequired = true
			keyspaceToRebuild = ti.Keyspace
			shardToRebuild = ti.Shard
			cellToRebuild = ti.Cell
		}
	}

	if rebuildRequired {
		if err := wr.RebuildShardGraph(keyspaceToRebuild, shardToRebuild, []string{cellToRebuild}); err != nil {
			return err
		}
	}
	return nil
}
Exemplo n.º 2
0
// ChangeTypeNoRebuild changes a tablet's type, and returns whether
// there's a shard that should be rebuilt, along with its cell,
// keyspace, and shard. If force is true, it will bypass the vtaction
// system and make the data change directly, and not run the remote
// hooks.
//
// Note we don't update the master record in the Shard here, as we
// can't ChangeType from and out of master anyway.
func (wr *Wrangler) ChangeTypeNoRebuild(tabletAlias topo.TabletAlias, tabletType topo.TabletType, force bool) (rebuildRequired bool, cell, keyspace, shard string, err error) {
	// Load tablet to find keyspace and shard assignment.
	// Don't load after the ChangeType which might have unassigned
	// the tablet.
	ti, err := wr.ts.GetTablet(tabletAlias)
	if err != nil {
		return false, "", "", "", err
	}

	if force {
		if err := tabletmanager.ChangeType(wr.ts, tabletAlias, tabletType, nil, false); err != nil {
			return false, "", "", "", err
		}
	} else {
		if wr.UseRPCs {
			if err := wr.ai.RpcChangeType(ti, tabletType, wr.actionTimeout()); err != nil {
				return false, "", "", "", err
			}

		} else {
			// the remote action will run the hooks
			actionPath, err := wr.ai.ChangeType(tabletAlias, tabletType)
			if err != nil {
				return false, "", "", "", err
			}

			// You don't have a choice - you must wait for
			// completion before rebuilding.
			if err := wr.ai.WaitForCompletion(actionPath, wr.actionTimeout()); err != nil {
				return false, "", "", "", err
			}
		}
	}

	if !ti.Tablet.IsInServingGraph() {
		// re-read the tablet, see if we become serving
		ti, err = wr.ts.GetTablet(tabletAlias)
		if err != nil {
			return false, "", "", "", err
		}
		if !ti.Tablet.IsInServingGraph() {
			return false, "", "", "", nil
		}
	}
	return true, ti.Alias.Cell, ti.Keyspace, ti.Shard, nil

}
Exemplo n.º 3
0
func (tm *TabletManager) ChangeType(context *rpcproto.Context, args *topo.TabletType, reply *rpc.UnusedResponse) error {
	return tm.agent.RpcWrapLockAction(context.RemoteAddr, actionnode.TABLET_ACTION_CHANGE_TYPE, args, reply, func() error {
		return tabletmanager.ChangeType(tm.agent.TopoServer, tm.agent.TabletAlias, *args, true /*runHooks*/)
	})
}