Golang Cluster.Restart方法代碼示例

func testGossipPeeringsInner(
	ctx context.Context, t *testing.T, c cluster.Cluster, cfg cluster.TestConfig,
) {
	num := c.NumNodes()

	deadline := timeutil.Now().Add(cfg.Duration)

	waitTime := longWaitTime
	if cfg.Duration < waitTime {
		waitTime = shortWaitTime
	}

	for timeutil.Now().Before(deadline) {
		CheckGossip(ctx, t, c, waitTime, HasPeers(num))

		// Restart the first node.
		log.Infof(ctx, "restarting node 0")
		if err := c.Restart(ctx, 0); err != nil {
			t.Fatal(err)
		}
		CheckGossip(ctx, t, c, waitTime, HasPeers(num))

		// Restart another node (if there is one).
		var pickedNode int
		if num > 1 {
			pickedNode = rand.Intn(num-1) + 1
		}
		log.Infof(ctx, "restarting node %d", pickedNode)
		if err := c.Restart(ctx, pickedNode); err != nil {
			t.Fatal(err)
		}
		CheckGossip(ctx, t, c, waitTime, HasPeers(num))
	}
}

func testFreezeClusterInner(t *testing.T, c cluster.Cluster, cfg cluster.TestConfig) {
	minAffected := int64(server.ExpectedInitialRangeCount())

	const long = time.Minute
	const short = 10 * time.Second

	mustPost := func(freeze bool) serverpb.ClusterFreezeResponse {
		reply, err := postFreeze(c, freeze, long)
		if err != nil {
			t.Fatal(errors.Errorf("%v", err))
		}
		return reply
	}

	if reply := mustPost(false); reply.RangesAffected != 0 {
		t.Fatalf("expected initial unfreeze to affect no ranges, got %d", reply.RangesAffected)
	}

	if reply := mustPost(true); reply.RangesAffected < minAffected {
		t.Fatalf("expected >=%d frozen ranges, got %d", minAffected, reply.RangesAffected)
	}

	if reply := mustPost(true); reply.RangesAffected != 0 {
		t.Fatalf("expected second freeze to affect no ranges, got %d", reply.RangesAffected)
	}

	if reply := mustPost(false); reply.RangesAffected < minAffected {
		t.Fatalf("expected >=%d thawed ranges, got %d", minAffected, reply.RangesAffected)
	}

	num := c.NumNodes()
	if num < 3 {
		t.Skip("skipping remainder of test; needs at least 3 nodes")
	}

	// Kill the last node.
	if err := c.Kill(num - 1); err != nil {
		t.Fatal(err)
	}

	// Attempt to freeze should get stuck (since it does not get confirmation
	// of the last node receiving the freeze command).
	// Note that this is the freeze trigger stalling on the Replica, not the
	// Store-polling mechanism.
	acceptErrs := strings.Join([]string{
		"timed out waiting for Range",
		"Timeout exceeded while",
		"connection is closing",
		"deadline",
		// error returned via JSON when the server-side gRPC stream times out (due to
		// lack of new input). Unmarshaling that JSON fails with a message referencing
		// unknown fields, unfortunately in map order.
		"unknown field .*",
	}, "|")
	if reply, err := postFreeze(c, true, short); !testutils.IsError(err, acceptErrs) {
		t.Fatalf("expected timeout, got %v: %v", err, reply)
	}

	// Shut down the remaining nodes and restart them.
	for i := 0; i < num-1; i++ {
		if err := c.Kill(i); err != nil {
			t.Fatal(err)
		}
	}
	for i := 0; i < num; i++ {
		if err := c.Restart(i); err != nil {
			t.Fatal(err)
		}
	}

	// The cluster should now be fully operational (at least after waiting
	// a little bit) since each node tries to unfreeze everything when it
	// starts.
	if err := util.RetryForDuration(time.Minute, func() error {
		if _, err := postFreeze(c, false, short); err != nil {
			if testutils.IsError(err, "404 Not Found") {
				// It can take a bit until the endpoint is available.
				return err
			}
			t.Fatal(err)
		}

		// TODO(tschottdorf): moving the client creation outside of the retry
		// loop will break the test with the following message:
		//
		//   client/rpc_sender.go:61: roachpb.Batch RPC failed as client
		//   connection was closed
		//
		// Perhaps the cluster updates the address too late after restarting
		// the node.
		db, dbStopper := c.NewClient(t, 0)
		defer dbStopper.Stop()

		if _, err := db.Scan(context.TODO(), keys.LocalMax, roachpb.KeyMax, 0); err != nil {
			t.Fatal(err)
		}
		return nil
	}); err != nil {
		t.Fatal(err)
	}
//.........這裏部分代碼省略.........

// chaosMonkey picks a set of nodes and restarts them. If stopClients is set
// all the clients are locked before the nodes are restarted.
func chaosMonkey(
	ctx context.Context,
	state *testState,
	c cluster.Cluster,
	stopClients bool,
	pickNodes func() []int,
	consistentIdx int,
) {
	defer close(state.teardown)
	for curRound := uint64(1); !state.done(); curRound++ {
		atomic.StoreUint64(&state.monkeyIteration, curRound)
		select {
		case <-stopper.ShouldStop():
			return
		default:
		}

		// Pick nodes to be restarted.
		nodes := pickNodes()

		if stopClients {
			// Prevent all clients from writing while nodes are being restarted.
			for i := 0; i < len(state.clients); i++ {
				state.clients[i].Lock()
			}
		}
		log.Infof(ctx, "round %d: restarting nodes %v", curRound, nodes)
		for _, i := range nodes {
			// Two early exit conditions.
			select {
			case <-stopper.ShouldStop():
				break
			default:
			}
			if state.done() {
				break
			}
			log.Infof(ctx, "round %d: restarting %d", curRound, i)
			if err := c.Kill(ctx, i); err != nil {
				state.t.Error(err)
			}
			if err := c.Restart(ctx, i); err != nil {
				state.t.Error(err)
			}
			if stopClients {
				// Reinitialize the client talking to the restarted node.
				state.initClient(ctx, state.t, c, i)
			}
		}
		if stopClients {
			for i := 0; i < len(state.clients); i++ {
				state.clients[i].Unlock()
			}
		}

		preCount := state.counts()

		madeProgress := func() bool {
			newCounts := state.counts()
			for i := range newCounts {
				if newCounts[i] > preCount[i] {
					return true
				}
			}
			return false
		}

		// Sleep until at least one client is writing successfully.
		log.Warningf(ctx, "round %d: monkey sleeping while cluster recovers...", curRound)
		for !state.done() && !madeProgress() {
			time.Sleep(time.Second)
		}
		c.Assert(ctx, state.t)

		if err := cluster.Consistent(ctx, c, consistentIdx); err != nil {
			state.t.Error(err)
		}
		log.Warningf(ctx, "round %d: cluster recovered", curRound)
	}
}

func testEventLogInner(
	ctx context.Context, t *testing.T, c cluster.Cluster, cfg cluster.TestConfig,
) {
	num := c.NumNodes()
	if num <= 0 {
		t.Fatalf("%d nodes in cluster", num)
	}

	var confirmedClusterID uuid.UUID
	type nodeEventInfo struct {
		Descriptor roachpb.NodeDescriptor
		ClusterID  uuid.UUID
	}

	// Verify that a node_join message was logged for each node in the cluster.
	// We expect there to eventually be one such message for each node in the
	// cluster, and each message must be correctly formatted.
	util.SucceedsSoon(t, func() error {
		db := makePGClient(t, c.PGUrl(ctx, 0))
		defer db.Close()

		// Query all node join events. There should be one for each node in the
		// cluster.
		rows, err := db.Query(
			"SELECT targetID, info FROM system.eventlog WHERE eventType = $1",
			string(csql.EventLogNodeJoin))
		if err != nil {
			return err
		}
		seenIds := make(map[int64]struct{})
		var clusterID uuid.UUID
		for rows.Next() {
			var targetID int64
			var infoStr gosql.NullString
			if err := rows.Scan(&targetID, &infoStr); err != nil {
				t.Fatal(err)
			}

			// Verify the stored node descriptor.
			if !infoStr.Valid {
				t.Fatalf("info not recorded for node join, target node %d", targetID)
			}
			var info nodeEventInfo
			if err := json.Unmarshal([]byte(infoStr.String), &info); err != nil {
				t.Fatal(err)
			}
			if a, e := int64(info.Descriptor.NodeID), targetID; a != e {
				t.Fatalf("Node join with targetID %d had descriptor for wrong node %d", e, a)
			}

			// Verify cluster ID is recorded, and is the same for all nodes.
			if (info.ClusterID == uuid.UUID{}) {
				t.Fatalf("Node join recorded nil cluster id, info: %v", info)
			}
			if (clusterID == uuid.UUID{}) {
				clusterID = info.ClusterID
			} else if clusterID != info.ClusterID {
				t.Fatalf(
					"Node join recorded different cluster ID than earlier node. Expected %s, got %s. Info: %v",
					clusterID, info.ClusterID, info)
			}

			// Verify that all NodeIDs are different.
			if _, ok := seenIds[targetID]; ok {
				t.Fatalf("Node ID %d seen in two different node join messages", targetID)
			}
			seenIds[targetID] = struct{}{}
		}
		if err := rows.Err(); err != nil {
			return err
		}

		if a, e := len(seenIds), c.NumNodes(); a != e {
			return errors.Errorf("expected %d node join messages, found %d: %v", e, a, seenIds)
		}

		confirmedClusterID = clusterID
		return nil
	})

	// Stop and Start Node 0, and verify the node restart message.
	if err := c.Kill(ctx, 0); err != nil {
		t.Fatal(err)
	}
	if err := c.Restart(ctx, 0); err != nil {
		t.Fatal(err)
	}

	util.SucceedsSoon(t, func() error {
		db := makePGClient(t, c.PGUrl(ctx, 0))
		defer db.Close()

		// Query all node restart events. There should only be one.
		rows, err := db.Query(
			"SELECT targetID, info FROM system.eventlog WHERE eventType = $1",
			string(csql.EventLogNodeRestart))
		if err != nil {
			return err
		}

//.........這裏部分代碼省略.........

func testGossipRestartInner(
	ctx context.Context, t *testing.T, c cluster.Cluster, cfg cluster.TestConfig,
) {
	// This already replicates the first range (in the local setup).
	// The replication of the first range is important: as long as the
	// first range only exists on one node, that node can trivially
	// acquire the range lease. Once the range is replicated, however,
	// nodes must be able to discover each other over gossip before the
	// lease can be acquired.
	num := c.NumNodes()

	deadline := timeutil.Now().Add(cfg.Duration)

	waitTime := longWaitTime
	if cfg.Duration < waitTime {
		waitTime = shortWaitTime
	}

	for timeutil.Now().Before(deadline) {
		log.Infof(ctx, "waiting for initial gossip connections")
		CheckGossip(ctx, t, c, waitTime, HasPeers(num))
		CheckGossip(ctx, t, c, waitTime, hasClusterID)
		CheckGossip(ctx, t, c, waitTime, hasSentinel)

		log.Infof(ctx, "killing all nodes")
		for i := 0; i < num; i++ {
			if err := c.Kill(ctx, i); err != nil {
				t.Fatal(err)
			}
		}

		log.Infof(ctx, "restarting all nodes")
		for i := 0; i < num; i++ {
			if err := c.Restart(ctx, i); err != nil {
				t.Fatal(err)
			}
		}

		log.Infof(ctx, "waiting for gossip to be connected")
		CheckGossip(ctx, t, c, waitTime, HasPeers(num))
		CheckGossip(ctx, t, c, waitTime, hasClusterID)
		CheckGossip(ctx, t, c, waitTime, hasSentinel)

		for i := 0; i < num; i++ {
			db, err := c.NewClient(ctx, i)
			if err != nil {
				t.Fatal(err)
			}
			if i == 0 {
				if err := db.Del(ctx, "count"); err != nil {
					t.Fatal(err)
				}
			}
			var kv client.KeyValue
			if err := db.Txn(ctx, func(txn *client.Txn) error {
				var err error
				kv, err = txn.Inc("count", 1)
				return err
			}); err != nil {
				t.Fatal(err)
			} else if v := kv.ValueInt(); v != int64(i+1) {
				t.Fatalf("unexpected value %d for write #%d (expected %d)", v, i, i+1)
			}
		}
	}
}