Esempio n. 1
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// SnapshotSourceEnd restores the state of the server after a
// Snapshot(server_mode =true)
// Should be called under RpcWrapLockAction.
func (agent *ActionAgent) SnapshotSourceEnd(ctx context.Context, args *actionnode.SnapshotSourceEndArgs) error {
	tablet, err := agent.TopoServer.GetTablet(agent.TabletAlias)
	if err != nil {
		return err
	}
	if tablet.Type != topo.TYPE_SNAPSHOT_SOURCE {
		return fmt.Errorf("expected snapshot_source type, not %v", tablet.Type)
	}

	if err := agent.Mysqld.SnapshotSourceEnd(args.SlaveStartRequired, args.ReadOnly, true, agent.hookExtraEnv()); err != nil {
		log.Errorf("SnapshotSourceEnd failed, leaving tablet type alone: %v", err)
		return err
	}

	// change the type back
	if args.OriginalType == topo.TYPE_MASTER {
		// force the master update
		tablet.Tablet.Type = topo.TYPE_MASTER
		err = topo.UpdateTablet(ctx, agent.TopoServer, tablet)
	} else {
		err = topotools.ChangeType(agent.TopoServer, tablet.Alias, args.OriginalType, make(map[string]string), true /*runHooks*/)
	}

	return err
}
Esempio n. 2
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// 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 RPC action
// 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 := topotools.ChangeType(wr.ts, tabletAlias, tabletType, nil, false); err != nil {
			return false, "", "", "", err
		}
	} else {
		if err := wr.tmc.ChangeType(wr.ctx, ti, tabletType); 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

}
Esempio n. 3
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// terminateHealthChecks is called when we enter lame duck mode.
// We will clean up our state, and shut down query service.
// We only do something if we are in targetTabletType state, and then
// we just go to spare.
func (agent *ActionAgent) terminateHealthChecks(targetTabletType topo.TabletType) {
	agent.actionMutex.Lock()
	defer agent.actionMutex.Unlock()
	log.Info("agent.terminateHealthChecks is starting")

	// read the current tablet record
	tablet := agent.Tablet()
	if tablet.Type != targetTabletType {
		log.Infof("Tablet in state %v, not changing it", tablet.Type)
		return
	}

	// Change the Type to spare, update the health. Note we pass in a map
	// that's not nil, meaning we will clear it.
	if err := topotools.ChangeType(agent.TopoServer, tablet.Alias, topo.TYPE_SPARE, make(map[string]string), true /*runHooks*/); err != nil {
		log.Infof("Error updating tablet record: %v", err)
		return
	}

	// Rebuild the serving graph in our cell, only if we're dealing with
	// a serving type
	if err := agent.rebuildShardIfNeeded(tablet, targetTabletType); err != nil {
		log.Warningf("rebuildShardIfNeeded failed (will still run post action callbacks, serving graph might be out of date): %v", err)
	}

	// We've already rebuilt the shard, which is the only reason we registered
	// ourself as OnTermSync (synchronous). The rest can be done asynchronously.
	go func() {
		// Run the post action callbacks (let them shutdown the query service)
		if err := agent.refreshTablet(context.TODO(), "terminatehealthcheck"); err != nil {
			log.Warningf("refreshTablet failed: %v", err)
		}
	}()
}
Esempio n. 4
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// Operate on restore tablet.
// Check that the SnapshotManifest is valid and the master has not changed.
// Shutdown mysqld.
// Load the snapshot from source tablet.
// Restart mysqld and replication.
// Put tablet into the replication graph as a spare.
// Should be called under RpcWrapLockAction.
func (agent *ActionAgent) Restore(ctx context.Context, args *actionnode.RestoreArgs, logger logutil.Logger) error {
	// read our current tablet, verify its state
	tablet, err := agent.TopoServer.GetTablet(agent.TabletAlias)
	if err != nil {
		return err
	}
	if args.WasReserved {
		if tablet.Type != topo.TYPE_RESTORE {
			return fmt.Errorf("expected restore type, not %v", tablet.Type)
		}
	} else {
		if tablet.Type != topo.TYPE_IDLE {
			return fmt.Errorf("expected idle type, not %v", tablet.Type)
		}
	}
	// read the source tablet, compute args.SrcFilePath if default
	sourceTablet, err := agent.TopoServer.GetTablet(args.SrcTabletAlias)
	if err != nil {
		return err
	}
	if strings.ToLower(args.SrcFilePath) == "default" {
		args.SrcFilePath = path.Join(mysqlctl.SnapshotURLPath, mysqlctl.SnapshotManifestFile)
	}

	// read the parent tablet, verify its state
	parentTablet, err := agent.TopoServer.GetTablet(args.ParentAlias)
	if err != nil {
		return err
	}
	if parentTablet.Type != topo.TYPE_MASTER && parentTablet.Type != topo.TYPE_SNAPSHOT_SOURCE {
		return fmt.Errorf("restore expected master or snapshot_source parent: %v %v", parentTablet.Type, args.ParentAlias)
	}

	// read & unpack the manifest
	sm := new(mysqlctl.SnapshotManifest)
	if err := fetchAndParseJsonFile(sourceTablet.Addr(), args.SrcFilePath, sm); err != nil {
		return err
	}

	if !args.WasReserved {
		if err := agent.changeTypeToRestore(ctx, tablet, sourceTablet, parentTablet.Alias, sourceTablet.KeyRange); err != nil {
			return err
		}
	}

	// create the loggers: tee to console and source
	l := logutil.NewTeeLogger(logutil.NewConsoleLogger(), logger)

	// do the work
	if err := agent.Mysqld.RestoreFromSnapshot(l, sm, args.FetchConcurrency, args.FetchRetryCount, args.DontWaitForSlaveStart, agent.hookExtraEnv()); err != nil {
		log.Errorf("RestoreFromSnapshot failed (%v), scrapping", err)
		if err := topotools.Scrap(agent.TopoServer, agent.TabletAlias, false); err != nil {
			log.Errorf("Failed to Scrap after failed RestoreFromSnapshot: %v", err)
		}

		return err
	}

	// reload the schema
	agent.ReloadSchema(ctx)

	// change to TYPE_SPARE, we're done!
	return topotools.ChangeType(agent.TopoServer, agent.TabletAlias, topo.TYPE_SPARE, nil, true)
}
Esempio n. 5
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// Snapshot takes a db snapshot
// Should be called under RpcWrapLockAction.
func (agent *ActionAgent) Snapshot(ctx context.Context, args *actionnode.SnapshotArgs, logger logutil.Logger) (*actionnode.SnapshotReply, error) {
	// update our type to TYPE_BACKUP
	tablet, err := agent.TopoServer.GetTablet(agent.TabletAlias)
	if err != nil {
		return nil, err
	}
	originalType := tablet.Type

	// ForceMasterSnapshot: Normally a master is not a viable tablet
	// to snapshot.  However, there are degenerate cases where you need
	// to override this, for instance the initial clone of a new master.
	if tablet.Type == topo.TYPE_MASTER && args.ForceMasterSnapshot {
		// In this case, we don't bother recomputing the serving graph.
		// All queries will have to fail anyway.
		log.Infof("force change type master -> backup")
		// There is a legitimate reason to force in the case of a single
		// master.
		tablet.Tablet.Type = topo.TYPE_BACKUP
		err = topo.UpdateTablet(ctx, agent.TopoServer, tablet)
	} else {
		err = topotools.ChangeType(agent.TopoServer, tablet.Alias, topo.TYPE_BACKUP, make(map[string]string), true /*runHooks*/)
	}
	if err != nil {
		return nil, err
	}

	// let's update our internal state (stop query service and other things)
	if err := agent.refreshTablet(ctx, "snapshotStart"); err != nil {
		return nil, fmt.Errorf("failed to update state before snaphost: %v", err)
	}

	// create the loggers: tee to console and source
	l := logutil.NewTeeLogger(logutil.NewConsoleLogger(), logger)

	// now we can run the backup
	filename, slaveStartRequired, readOnly, returnErr := agent.Mysqld.CreateSnapshot(l, tablet.DbName(), tablet.Addr(), false, args.Concurrency, args.ServerMode, agent.hookExtraEnv())

	// and change our type to the appropriate value
	newType := originalType
	if returnErr != nil {
		log.Errorf("snapshot failed, restoring tablet type back to %v: %v", newType, returnErr)
	} else {
		if args.ServerMode {
			log.Infof("server mode specified, switching tablet to snapshot_source mode")
			newType = topo.TYPE_SNAPSHOT_SOURCE
		} else {
			log.Infof("change type back after snapshot: %v", newType)
		}
	}
	if tablet.Parent.Uid == topo.NO_TABLET && args.ForceMasterSnapshot && newType != topo.TYPE_SNAPSHOT_SOURCE {
		log.Infof("force change type backup -> master: %v", tablet.Alias)
		tablet.Tablet.Type = topo.TYPE_MASTER
		err = topo.UpdateTablet(ctx, agent.TopoServer, tablet)
	} else {
		err = topotools.ChangeType(agent.TopoServer, tablet.Alias, newType, nil, true /*runHooks*/)
	}
	if err != nil {
		// failure in changing the topology type is probably worse,
		// so returning that (we logged the snapshot error anyway)
		returnErr = err
	}

	// if anything failed, don't return anything
	if returnErr != nil {
		return nil, returnErr
	}

	// it all worked, return the required information
	sr := &actionnode.SnapshotReply{
		ManifestPath:       filename,
		SlaveStartRequired: slaveStartRequired,
		ReadOnly:           readOnly,
	}
	if tablet.Parent.Uid == topo.NO_TABLET {
		// If this is a master, this will be the new parent.
		// FIXME(msolomon) this doesn't work in hierarchical replication.
		sr.ParentAlias = tablet.Alias
	} else {
		sr.ParentAlias = tablet.Parent
	}
	return sr, nil
}
Esempio n. 6
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// ChangeType changes the tablet type
// Should be called under RpcWrapLockAction.
func (agent *ActionAgent) ChangeType(ctx context.Context, tabletType topo.TabletType) error {
	return topotools.ChangeType(agent.TopoServer, agent.TabletAlias, tabletType, nil, true /*runHooks*/)
}
Esempio n. 7
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// runHealthCheck takes the action mutex, runs the health check,
// and if we need to change our state, do it.
// If we are the master, we don't change our type, healthy or not.
// If we are not the master, we change to spare if not healthy,
// or to the passed in targetTabletType if healthy.
//
// Note we only update the topo record if we need to, that is if our type or
// health details changed.
func (agent *ActionAgent) runHealthCheck(targetTabletType topo.TabletType) {
	agent.actionMutex.Lock()
	defer agent.actionMutex.Unlock()

	// read the current tablet record and tablet control
	agent.mutex.Lock()
	tablet := agent._tablet
	tabletControl := agent._tabletControl
	agent.mutex.Unlock()

	// figure out if we should be running the query service
	shouldQueryServiceBeRunning := false
	var blacklistedTables []string
	if topo.IsRunningQueryService(targetTabletType) && agent.BinlogPlayerMap.size() == 0 {
		shouldQueryServiceBeRunning = true
		if tabletControl != nil {
			blacklistedTables = tabletControl.BlacklistedTables
			if tabletControl.DisableQueryService {
				shouldQueryServiceBeRunning = false
			}
		}
	}

	// run the health check
	typeForHealthCheck := targetTabletType
	if tablet.Type == topo.TYPE_MASTER {
		typeForHealthCheck = topo.TYPE_MASTER
	}
	health, err := health.Run(typeForHealthCheck, shouldQueryServiceBeRunning)

	// Figure out if we should be running QueryService. If we should,
	// and we aren't, try to start it (even if we're not healthy,
	// the reason we might not be healthy is the query service not running!)
	if shouldQueryServiceBeRunning {
		if err == nil {
			// we remember this new possible error
			err = agent.allowQueries(tablet.Tablet, blacklistedTables)
		} else {
			// we ignore the error
			agent.allowQueries(tablet.Tablet, blacklistedTables)
		}
	}

	// save the health record
	record := &HealthRecord{
		Error:  err,
		Result: health,
		Time:   time.Now(),
	}
	agent.History.Add(record)

	// try to figure out the mysql port if we don't have it yet
	if _, ok := tablet.Portmap["mysql"]; !ok {
		// we don't know the port, try to get it from mysqld
		mysqlPort, err := agent.Mysqld.GetMysqlPort()
		if err != nil {
			// Don't log if we're already in a waiting-for-mysql state.
			agent.mutex.Lock()
			if !agent._waitingForMysql {
				log.Warningf("Can't get mysql port, won't populate Tablet record in topology (will retry silently at healthcheck interval %v): %v", *healthCheckInterval, err)
				agent._waitingForMysql = true
			}
			agent.mutex.Unlock()
		} else {
			log.Infof("Updating tablet mysql port to %v", mysqlPort)
			if err := agent.TopoServer.UpdateTabletFields(tablet.Alias, func(tablet *topo.Tablet) error {
				tablet.Portmap["mysql"] = mysqlPort
				return nil
			}); err != nil {
				log.Infof("Error updating mysql port in tablet record: %v", err)
				return
			}

			// save the port so we don't update it again next time
			// we do the health check.
			agent.mutex.Lock()
			agent._tablet.Portmap["mysql"] = mysqlPort
			agent._waitingForMysql = false
			agent.mutex.Unlock()
		}
	}

	// remember our health status
	agent.mutex.Lock()
	agent._healthy = err
	agent.mutex.Unlock()

	// Update our topo.Server state, start with no change
	newTabletType := tablet.Type
	if err != nil {
		// The tablet is not healthy, let's see what we need to do
		if tablet.Type != targetTabletType {
			if tablet.Type != topo.TYPE_SPARE {
				// we only log if we're not in spare,
				// as the spare state is normal for a
				// failed health check.
				log.Infof("Tablet not healthy and in state %v, not changing it: %v", tablet.Type, err)
			}
			return
		}

		// Note that if the query service is running, we may
		// need to stop it. The post-action callback will do
		// it, and it will be done after we change our state,
		// so it's the right order, let it do it.
		log.Infof("Tablet not healthy, converting it from %v to spare: %v", targetTabletType, err)
		newTabletType = topo.TYPE_SPARE
	} else {
		// We are healthy, maybe with health, see if we need
		// to update the record. We only change from spare to
		// our target type.
		if tablet.Type == topo.TYPE_SPARE {
			newTabletType = targetTabletType
		}
		if tablet.Type == newTabletType && tablet.IsHealthEqual(health) {
			// no change in health, not logging anything,
			// and we're done
			return
		}

		// we need to update our state
		log.Infof("Updating tablet record as healthy type %v -> %v with health details %v -> %v", tablet.Type, newTabletType, tablet.Health, health)
		agent.lastHealthMapCount.Set(int64(len(health)))
	}

	// Change the Type, update the health. Note we pass in a map
	// that's not nil, meaning if it's empty, we will clear it.
	if err := topotools.ChangeType(agent.TopoServer, tablet.Alias, newTabletType, health, true /*runHooks*/); err != nil {
		log.Infof("Error updating tablet record: %v", err)
		return
	}

	// Rebuild the serving graph in our cell, only if we're dealing with
	// a serving type
	if err := agent.rebuildShardIfNeeded(tablet, targetTabletType); err != nil {
		log.Warningf("rebuildShardIfNeeded failed (will still run post action callbacks, serving graph might be out of date): %v", err)
	}

	// run the post action callbacks, not much we can do with returned error
	if err := agent.refreshTablet(context.TODO(), "healthcheck"); err != nil {
		log.Warningf("refreshTablet failed: %v", err)
	}
}