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clustering_test.go
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clustering_test.go
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// Copyright 2017-2019 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"bytes"
"database/sql"
"encoding/json"
"fmt"
"io/ioutil"
"math/rand"
"net"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/hashicorp/raft"
natsd "github.com/nats-io/nats-server/v2/server"
natsdTest "github.com/nats-io/nats-server/v2/test"
"github.com/nats-io/nats-streaming-server/stores"
"github.com/nats-io/nats-streaming-server/test"
"github.com/nats-io/nats-streaming-server/util"
"github.com/nats-io/nats.go"
"github.com/nats-io/stan.go"
"github.com/nats-io/stan.go/pb"
)
var defaultRaftLog string
func init() {
tmpDir, err := ioutil.TempDir("", "raft_logs_")
if err != nil {
panic("Could not create tmp dir")
}
if err := os.Remove(tmpDir); err != nil {
panic(fmt.Errorf("Error removing temp dir: %v", err))
}
defaultRaftLog = tmpDir
clusterSetupForTest()
}
func cleanupRaftLog(t *testing.T) {
if err := os.RemoveAll(defaultRaftLog); err != nil {
stackFatalf(t, "Error cleaning up raft log: %v", err)
}
}
func shutdownAndCleanupState(t *testing.T, s *StanServer, nodeID string) {
t.Helper()
s.Shutdown()
os.RemoveAll(filepath.Join(defaultRaftLog, nodeID))
switch persistentStoreType {
case stores.TypeFile:
os.RemoveAll(filepath.Join(defaultDataStore, nodeID))
case stores.TypeSQL:
test.CleanupSQLDatastore(t, testSQLDriver, testSQLSource+"_"+nodeID)
default:
t.Fatalf("This test needs to be updated for store type: %v", persistentStoreType)
}
}
func getTestDefaultOptsForClustering(id string, bootstrap bool) *Options {
opts := getTestDefaultOptsForPersistentStore()
if persistentStoreType == stores.TypeFile {
opts.FilestoreDir = filepath.Join(defaultDataStore, id)
opts.FileStoreOpts.BufferSize = 1024
} else if persistentStoreType == stores.TypeSQL {
// Since we need to have the databases created for all possible
// IDs, make sure that if someone adds a test with a new ID
// he/she adds it to the list of database names to create on
// test startup.
ok := false
suffix := "_" + id
for _, n := range testDBSuffixes {
if suffix == n {
ok = true
break
}
}
if !ok {
panic(fmt.Errorf("Clustering test with node ID %q, need to create the database for that id", id))
}
opts.SQLStoreOpts.Source = testSQLSource + suffix
}
opts.Clustering.Clustered = true
opts.Clustering.NodeID = id
opts.Clustering.Bootstrap = bootstrap
opts.Clustering.RaftLogPath = filepath.Join(defaultRaftLog, id)
opts.Clustering.LogCacheSize = DefaultLogCacheSize
opts.Clustering.LogSnapshots = 1
opts.Clustering.RaftLogging = true
opts.NATSServerURL = "nats://localhost:4222"
return opts
}
func getLeader(t *testing.T, timeout time.Duration, servers ...*StanServer) *StanServer {
var (
leader *StanServer
deadline = time.Now().Add(timeout)
)
for time.Now().Before(deadline) {
for _, s := range servers {
if s.state == Shutdown || s.raft == nil {
continue
}
if s.isLeader() {
if leader != nil {
stackFatalf(t, "Found more than one leader")
}
leader = s
}
}
if leader != nil {
break
}
time.Sleep(15 * time.Millisecond)
}
if leader == nil {
for _, s := range servers {
s.mu.Lock()
if s.raft == nil {
fmt.Printf(" server:%p state:%v raft state: nil lastErr=%v\n", s, s.state, s.lastError)
} else {
fmt.Printf(" server:%p state:%v raft state: %v lastErr=%v\n", s, s.state, s.raft.State(), s.lastError)
}
s.mu.Unlock()
}
printAllStacks()
stackFatalf(t, "Unable to find the leader")
}
return leader
}
func verifyNoLeader(t *testing.T, timeout time.Duration, servers ...*StanServer) {
deadline := time.Now().Add(timeout)
var leader *StanServer
for time.Now().Before(deadline) {
for _, server := range servers {
if server.raft == nil {
continue
}
if server.isLeader() {
leader = server
time.Sleep(100 * time.Millisecond)
break
}
}
return
}
stackFatalf(t, "Found unexpected leader %q", leader.info.NodeID)
}
func checkClientsInAllServers(t *testing.T, expected int, servers ...*StanServer) {
for _, srv := range servers {
waitForNumClients(t, srv, expected)
}
}
func checkChannelsInAllServers(t *testing.T, channels []string, timeout time.Duration, servers ...*StanServer) {
deadline := time.Now().Add(timeout)
OUTER:
for time.Now().Before(deadline) {
for _, server := range servers {
server.channels.RLock()
if len(server.channels.channels) != len(channels) {
server.channels.RUnlock()
time.Sleep(100 * time.Millisecond)
continue OUTER
}
for _, c := range channels {
if server.channels.get(c) == nil {
server.channels.RUnlock()
time.Sleep(100 * time.Millisecond)
continue OUTER
}
}
server.channels.RUnlock()
}
return
}
stackFatalf(t, "Channels are inconsistent")
}
type msg struct {
sequence uint64
data []byte
}
func verifyChannelConsistency(t *testing.T, channel string, timeout time.Duration,
expectedFirstSeq, expectedLastSeq uint64, expectedMsgs map[uint64]msg, servers ...*StanServer) {
deadline := time.Now().Add(timeout)
OUTER:
for time.Now().Before(deadline) {
for _, server := range servers {
c := server.channels.get(channel)
if c == nil {
time.Sleep(15 * time.Millisecond)
continue OUTER
}
store := c.store.Msgs
first, last, err := store.FirstAndLastSequence()
if err != nil {
stackFatalf(t, "Error getting sequence numbers: %v", err)
}
if first != expectedFirstSeq {
time.Sleep(15 * time.Millisecond)
continue OUTER
}
if last != expectedLastSeq {
time.Sleep(15 * time.Millisecond)
continue OUTER
}
for i := first; i <= last; i++ {
msg, err := store.Lookup(i)
if err != nil {
stackFatalf(t, "Error getting message %d: %v", i, err)
}
if msg == nil {
stackFatalf(t, "No stored message for i=%v expected=%v", i, expectedMsgs[i])
}
assertMsg(t, *msg, expectedMsgs[i].data, expectedMsgs[i].sequence)
}
}
return
}
stackFatalf(t, "Message stores are inconsistent")
}
func removeServer(servers []*StanServer, s *StanServer) []*StanServer {
for i, srv := range servers {
if srv == s {
servers = append(servers[:i], servers[i+1:]...)
}
}
return servers
}
func assertMsg(t *testing.T, msg pb.MsgProto, expectedData []byte, expectedSeq uint64) {
if msg.Sequence != expectedSeq {
stackFatalf(t, "Msg sequence incorrect, expected: %d, got: %d", expectedSeq, msg.Sequence)
}
if !bytes.Equal(msg.Data, expectedData) {
stackFatalf(t, "Msg data incorrect, expected: %s, got: %s", expectedData, msg.Data)
}
}
func TestClusteringMemoryStoreNotSupported(t *testing.T) {
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// Configure the server in non-clustered mode.
opts := getTestDefaultOptsForClustering("a", true)
opts.NATSServerURL = ""
opts.StoreType = stores.TypeMemory
s, err := RunServerWithOpts(opts, nil)
if err == nil {
if s != nil {
s.Shutdown()
}
t.Fatal("Expected error got none")
}
if !strings.Contains(err.Error(), stores.TypeMemory) {
t.Fatalf("Expected error about MEMORY store not supported, got %v", err)
}
}
// Ensure restarting a non-clustered server in clustered mode fails.
func TestClusteringRestart(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure the server in non-clustered mode.
s1sOpts := getTestDefaultOptsForClustering("a", false)
s1sOpts.Clustering.Clustered = false
s1 := runServerWithOpts(t, s1sOpts, nil)
// Restart in clustered mode. This should fail.
s1.Shutdown()
s1sOpts.Clustering.Clustered = true
_, err := RunServerWithOpts(s1sOpts, nil)
if err == nil {
t.Fatal("Expected error on server start")
}
if err != ErrClusteredRestart {
t.Fatalf("Incorrect error, expected: ErrClusteredRaftRestart, got: %v", err)
}
}
// Ensure starting a clustered node fails when there is no seed node to join.
func TestClusteringNoSeed(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server. Starting this should fail because there is no
// seed node.
s1sOpts := getTestDefaultOptsForClustering("a", false)
if _, err := RunServerWithOpts(s1sOpts, nil); err == nil {
t.Fatal("Expected error on server start")
}
}
// Ensure clustering node ID is assigned when not provided and stored/recovered
// on server restart.
func TestClusteringAssignedDurableNodeID(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure server.
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Wait to elect self as leader.
leader := getLeader(t, 10*time.Second, s1)
future := leader.raft.GetConfiguration()
if err := future.Error(); err != nil {
t.Fatalf("Unexpected error on GetConfiguration: %v", err)
}
id := future.Configuration().Servers[0].ID
if id == "" {
t.Fatal("Expected non-empty cluster node id")
}
// Restart server without setting node ID.
s1.Shutdown()
s1sOpts.Clustering.NodeID = ""
s1 = runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Wait to elect self as leader.
leader = getLeader(t, 10*time.Second, s1)
future = leader.raft.GetConfiguration()
if err := future.Error(); err != nil {
t.Fatalf("Unexpected error on GetConfiguration: %v", err)
}
newID := future.Configuration().Servers[0].ID
if id != newID {
t.Fatalf("Incorrect cluster node id, expected: %s, got: %s", id, newID)
}
}
// Ensure clustering node ID is stored and recovered on server restart.
func TestClusteringDurableNodeID(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure server.
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1sOpts.Clustering.NodeID = "a"
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Wait to elect self as leader.
leader := getLeader(t, 10*time.Second, s1)
future := leader.raft.GetConfiguration()
if err := future.Error(); err != nil {
t.Fatalf("Unexpected error on GetConfiguration: %v", err)
}
id := future.Configuration().Servers[0].ID
if id != "a" {
t.Fatalf("Incorrect cluster node id, expected: a, got: %s", id)
}
// Restart server without setting node ID.
s1.Shutdown()
s1sOpts.Clustering.NodeID = ""
s1 = runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Wait to elect self as leader.
leader = getLeader(t, 10*time.Second, s1)
future = leader.raft.GetConfiguration()
if err := future.Error(); err != nil {
t.Fatalf("Unexpected error on GetConfiguration: %v", err)
}
newID := future.Configuration().Servers[0].ID
if newID != "a" {
t.Fatalf("Incorrect cluster node id, expected: a, got: %s", newID)
}
}
// Ensure starting a cluster with auto configuration works when we start one
// node in bootstrap mode.
func TestClusteringBootstrapAutoConfig(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server as a seed.
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Configure second server which should automatically join the first.
s2sOpts := getTestDefaultOptsForClustering("b", false)
s2 := runServerWithOpts(t, s2sOpts, nil)
defer s2.Shutdown()
var (
servers = []*StanServer{s1, s2}
leader = getLeader(t, 10*time.Second, servers...)
)
// Verify configuration.
future := leader.raft.GetConfiguration()
if err := future.Error(); err != nil {
t.Fatalf("Unexpected error on GetConfiguration: %v", err)
}
configServers := future.Configuration().Servers
if len(configServers) != 2 {
t.Fatalf("Expected 2 servers, got %d", len(configServers))
}
// Speed-up shutdown
s1.Shutdown()
}
// Ensure starting a cluster with manual configuration works when we provide
// the cluster configuration to each server.
func TestClusteringBootstrapManualConfig(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server.
s1sOpts := getTestDefaultOptsForClustering("a", false)
s1sOpts.Clustering.NodeID = "a"
s1sOpts.Clustering.Peers = []string{"b"}
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Configure second server.
s2sOpts := getTestDefaultOptsForClustering("b", false)
s2sOpts.Clustering.NodeID = "b"
s2sOpts.Clustering.Peers = []string{"a"}
s2 := runServerWithOpts(t, s2sOpts, nil)
defer s2.Shutdown()
var (
servers = []*StanServer{s1, s2}
leader = getLeader(t, 10*time.Second, servers...)
)
// Verify configuration.
future := leader.raft.GetConfiguration()
if err := future.Error(); err != nil {
t.Fatalf("Unexpected error on GetConfiguration: %v", err)
}
configServers := future.Configuration().Servers
if len(configServers) != 2 {
t.Fatalf("Expected 2 servers, got %d", len(configServers))
}
// Ensure new servers can automatically join once the cluster is formed.
s3sOpts := getTestDefaultOptsForClustering("c", false)
s3 := runServerWithOpts(t, s3sOpts, nil)
defer s3.Shutdown()
future = leader.raft.GetConfiguration()
if err := future.Error(); err != nil {
t.Fatalf("Unexpected error on GetConfiguration: %v", err)
}
configServers = future.Configuration().Servers
if len(configServers) != 3 {
t.Fatalf("Expected 3 servers, got %d", len(configServers))
}
}
func TestClusteringBootstrapMisconfiguration(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// The first server will create route to second server.
// This is to test that a server may not be able to detect
// the misconfiguration right away.
// Configure first server as a seed.
n1Opts := natsdTest.DefaultTestOptions
n1Opts.Host = "127.0.0.1"
n1Opts.Port = 4222
n1Opts.Cluster.Host = "127.0.0.1"
n1Opts.Cluster.Port = 6222
n1Opts.Routes = natsd.RoutesFromStr("nats://127.0.0.1:6223")
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1sOpts.NATSServerURL = ""
s1Logger := &captureFatalLogger{}
s1sOpts.CustomLogger = s1Logger
s1sOpts.EnableLogging = true
s1 := runServerWithOpts(t, s1sOpts, &n1Opts)
defer s1.Shutdown()
getLeader(t, 10*time.Second, s1)
// Configure second server on same cluster as a seed too.
// Servers should stop.
n2Opts := natsdTest.DefaultTestOptions
n2Opts.Host = "127.0.0.1"
n2Opts.Port = 4223
n2Opts.Cluster.Host = "localhost"
n2Opts.Cluster.Port = 6223
s2sOpts := getTestDefaultOptsForClustering("b", true)
s2sOpts.NATSServerURL = ""
s2Logger := &captureFatalLogger{}
s2sOpts.CustomLogger = s2Logger
s2sOpts.EnableLogging = true
s2 := runServerWithOpts(t, s2sOpts, &n2Opts)
defer s2.Shutdown()
// After a little while, servers should detect that they were
// both started with the bootstrap flag and exit.
ok := false
timeout := time.Now().Add(5 * time.Second)
for time.Now().Before(timeout) {
check := func(otherServer *StanServer, l *captureFatalLogger) bool {
l.Lock()
defer l.Unlock()
if l.fatal != "" {
if strings.Contains(l.fatal, otherServer.serverID) {
return true
}
}
return false
}
ok = check(s1, s2Logger)
if ok {
ok = check(s2, s1Logger)
}
if ok {
break
}
time.Sleep(15 * time.Millisecond)
}
if !ok {
t.Fatal("Servers should have reported fatal error")
}
}
// Ensure basic replication works as expected. This test starts three servers
// in a cluster, publishes messages to the cluster, kills the leader, publishes
// more messages, kills the new leader, verifies progress cannot be made when
// there is no leader, then brings the cluster back online and verifies
// catchup and consistency.
func TestClusteringBasic(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Configure second server.
s2sOpts := getTestDefaultOptsForClustering("b", false)
s2 := runServerWithOpts(t, s2sOpts, nil)
defer s2.Shutdown()
// Configure third server.
s3sOpts := getTestDefaultOptsForClustering("c", false)
s3 := runServerWithOpts(t, s3sOpts, nil)
defer s3.Shutdown()
servers := []*StanServer{s1, s2, s3}
for _, s := range servers {
checkState(t, s, Clustered)
}
// Wait for leader to be elected.
getLeader(t, 10*time.Second, servers...)
// Create a client connection.
sc, err := stan.Connect(clusterName, clientName)
if err != nil {
t.Fatalf("Expected to connect correctly, got err %v", err)
}
defer sc.Close()
// Publish a message (this will create the channel and form the Raft group).
channel := "foo"
if err := sc.Publish(channel, []byte("hello")); err != nil {
t.Fatalf("Unexpected error on publish: %v", err)
}
ch := make(chan *stan.Msg, 100)
sub, err := sc.Subscribe(channel, func(msg *stan.Msg) {
ch <- msg
}, stan.DeliverAllAvailable(), stan.MaxInflight(1))
if err != nil {
t.Fatalf("Error subscribing: %v", err)
}
select {
case msg := <-ch:
assertMsg(t, msg.MsgProto, []byte("hello"), 1)
case <-time.After(2 * time.Second):
t.Fatal("expected msg")
}
sub.Unsubscribe()
stopped := []*StanServer{}
// Take down the leader.
leader := getLeader(t, 10*time.Second, servers...)
leader.Shutdown()
stopped = append(stopped, leader)
servers = removeServer(servers, leader)
// Wait for the new leader to be elected.
leader = getLeader(t, 10*time.Second, servers...)
// Publish some more messages.
for i := 0; i < 5; i++ {
if err := sc.Publish(channel, []byte(strconv.Itoa(i))); err != nil {
t.Fatalf("Unexpected error on publish %d: %v", i, err)
}
}
// Read everything back from the channel.
sub, err = sc.Subscribe(channel, func(msg *stan.Msg) {
ch <- msg
}, stan.DeliverAllAvailable(), stan.MaxInflight(1))
if err != nil {
t.Fatalf("Error subscribing: %v", err)
}
select {
case msg := <-ch:
assertMsg(t, msg.MsgProto, []byte("hello"), 1)
case <-time.After(2 * time.Second):
t.Fatal("expected msg")
}
for i := 0; i < 5; i++ {
select {
case msg := <-ch:
assertMsg(t, msg.MsgProto, []byte(strconv.Itoa(i)), uint64(i+2))
case <-time.After(2 * time.Second):
t.Fatal("expected msg")
}
}
sub.Unsubscribe()
// Take down the leader.
leader.Shutdown()
stopped = append(stopped, leader)
servers = removeServer(servers, leader)
// Creating a new connection should fail since there should not be a leader.
_, err = stan.Connect(clusterName, clientName+"-2", stan.PubAckWait(time.Second), stan.ConnectWait(time.Second))
if err == nil {
t.Fatal("Expected error on connect")
}
// Bring one node back up.
s := stopped[0]
stopped = stopped[1:]
s = runServerWithOpts(t, s.opts, nil)
servers = append(servers, s)
defer s.Shutdown()
// Wait for the new leader to be elected.
getLeader(t, 10*time.Second, servers...)
// Publish some more messages.
for i := 0; i < 5; i++ {
if err := sc.Publish(channel, []byte("foo-"+strconv.Itoa(i))); err != nil {
t.Fatalf("Unexpected error on publish %d: %v", i, err)
}
}
// Bring the last node back up.
s = stopped[0]
s = runServerWithOpts(t, s.opts, nil)
servers = append(servers, s)
defer s.Shutdown()
// Ensure there is still a leader.
leader = getLeader(t, 10*time.Second, servers...)
// Publish one more message.
if err := sc.Publish(channel, []byte("goodbye")); err != nil {
t.Fatalf("Unexpected error on publish: %v", err)
}
// Verify the server stores are consistent.
expected := make(map[uint64]msg, 12)
expected[1] = msg{sequence: 1, data: []byte("hello")}
for i := uint64(0); i < 5; i++ {
expected[i+2] = msg{sequence: uint64(i + 2), data: []byte(strconv.Itoa(int(i)))}
}
for i := uint64(0); i < 5; i++ {
expected[i+7] = msg{sequence: uint64(i + 7), data: []byte("foo-" + strconv.Itoa(int(i)))}
}
expected[12] = msg{sequence: 12, data: []byte("goodbye")}
verifyChannelConsistency(t, channel, 10*time.Second, 1, 12, expected, servers...)
sc.Close()
// Speed-up shutdown
leader.Shutdown()
s1.Shutdown()
s2.Shutdown()
s3.Shutdown()
}
func TestClusteringNoPanicOnShutdown(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Configure second server.
s2sOpts := getTestDefaultOptsForClustering("b", false)
s2 := runServerWithOpts(t, s2sOpts, nil)
defer s2.Shutdown()
servers := []*StanServer{s1, s2}
// Wait for leader to be elected.
leader := getLeader(t, 10*time.Second, servers...)
sc, err := stan.Connect(clusterName, clientName, stan.PubAckWait(time.Second))
if err != nil {
t.Fatalf("Error on connect: %v", err)
}
defer sc.Close()
sub, err := sc.Subscribe("foo", func(_ *stan.Msg) {})
if err != nil {
t.Fatalf("Unexpected error on subscribe: %v", err)
}
// Unsubscribe since this is not about that
sub.Unsubscribe()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
for {
if err := sc.Publish("foo", []byte("msg")); err != nil {
return
}
}
}()
// Wait so that go-routine is in middle of sending messages
time.Sleep(time.Duration(rand.Intn(500)+100) * time.Millisecond)
// We shutdown the follower, it should not panic.
follower := s1
if s1 == leader {
follower = s2
}
follower.Shutdown()
wg.Wait()
// Restart follower to speed up client disconnect.
follower = runServerWithOpts(t, follower.opts, nil)
defer follower.Shutdown()
// Close client explicitly otherwise follower will be shutdown
// first and then client close will timeout since only 1 node
// in cluster (no leader)
sc.Close()
leader.Shutdown()
}
func TestClusteringLeaderFlap(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Configure second server.
s2sOpts := getTestDefaultOptsForClustering("b", false)
s2 := runServerWithOpts(t, s2sOpts, nil)
defer s2.Shutdown()
servers := []*StanServer{s1, s2}
// Wait for leader to be elected.
leader := getLeader(t, 10*time.Second, servers...)
sc, err := stan.Connect(clusterName, clientName, stan.PubAckWait(2*time.Second))
if err != nil {
t.Fatalf("Error on connect: %v", err)
}
defer sc.Close()
// Publish a message (this will create the channel and form the Raft group).
channel := "foo"
if err := sc.Publish(channel, []byte("hello")); err != nil {
t.Fatalf("Unexpected error on publish: %v", err)
}
// Kill the follower.
var follower *StanServer
if s1 == leader {
s2.Shutdown()
follower = s2
} else {
s1.Shutdown()
follower = s1
}
servers = removeServer(servers, follower)
// Ensure there is no leader now.
verifyNoLeader(t, 5*time.Second, s1, s2)
// Bring the follower back up.
follower = runServerWithOpts(t, follower.opts, nil)
defer follower.Shutdown()
servers = append(servers, follower)
// Ensure there is a new leader.
getLeader(t, 10*time.Second, servers...)
}
func TestClusteringDontRecoverFSClientsAndSubs(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1sOpts.Clustering.TrailingLogs = 0
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Configure second server.
s2sOpts := getTestDefaultOptsForClustering("b", false)
s2sOpts.Clustering.TrailingLogs = 0
s2 := runServerWithOpts(t, s2sOpts, nil)
defer s2.Shutdown()
servers := []*StanServer{s1, s2}
getLeader(t, 10*time.Second, servers...)
sc, err := stan.Connect(clusterName, clientName, stan.ConnectWait(500*time.Millisecond))
if err != nil {
t.Fatalf("Error on connect: %v", err)
}
defer sc.Close()
if _, err := sc.Subscribe("foo", func(_ *stan.Msg) {},
stan.DurableName("du")); err != nil {
t.Fatalf("Error on subscribe: %v", err)
}
s1.Shutdown()
s2.Shutdown()
s1 = runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
clients := s1.clients.getClients()
if len(clients) != 0 {
t.Fatalf("Should not have recovered clients from store, got %v", clients)
}
c := s1.channels.get("foo")
c.ss.RLock()
dur := c.ss.durables
c.ss.RUnlock()
if len(dur) != 0 {
t.Fatalf("Should not have recovered subscription from store, got %v", dur)
}
sc.Close()
}
func TestClusteringLogSnapshotRestore(t *testing.T) {
cleanupDatastore(t)
defer cleanupDatastore(t)
cleanupRaftLog(t)
defer cleanupRaftLog(t)
// For this test, use a central NATS server.
ns := natsdTest.RunDefaultServer()
defer ns.Shutdown()
// Configure first server
s1sOpts := getTestDefaultOptsForClustering("a", true)
s1sOpts.Clustering.TrailingLogs = 0
s1 := runServerWithOpts(t, s1sOpts, nil)
defer s1.Shutdown()
// Configure second server.
s2sOpts := getTestDefaultOptsForClustering("b", false)
s2sOpts.Clustering.TrailingLogs = 0
s2 := runServerWithOpts(t, s2sOpts, nil)
defer s2.Shutdown()
// Configure third server.
s3sOpts := getTestDefaultOptsForClustering("c", false)
s3sOpts.Clustering.TrailingLogs = 0
s3 := runServerWithOpts(t, s3sOpts, nil)
defer s3.Shutdown()
servers := []*StanServer{s1, s2, s3}
for _, s := range servers {
checkState(t, s, Clustered)
}
// Wait for leader to be elected.
leader := getLeader(t, 10*time.Second, servers...)
// Create a client connection.
sc, err := stan.Connect(clusterName, clientName)
if err != nil {
t.Fatalf("Expected to connect correctly, got err %v", err)
}
defer sc.Close()