// Ensure that the cluster configuration can be reloaded.
func TestClusterConfigReload(t *testing.T) {
procAttr := &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}
argGroup, etcds, err := CreateCluster(3, procAttr, false)
assert.NoError(t, err)
defer DestroyCluster(etcds)
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":3, "removeDelay":60}`))
assert.Equal(t, resp.StatusCode, 200)
time.Sleep(1 * time.Second)
resp, _ = tests.Get("http://localhost:7002/v2/admin/config")
body := tests.ReadBodyJSON(resp)
assert.Equal(t, resp.StatusCode, 200)
assert.Equal(t, body["activeSize"], 3)
assert.Equal(t, body["removeDelay"], 60)
// kill all
DestroyCluster(etcds)
for i := 0; i < 3; i++ {
etcds[i], err = os.StartProcess(EtcdBinPath, argGroup[i], procAttr)
}
time.Sleep(1 * time.Second)
resp, _ = tests.Get("http://localhost:7002/v2/admin/config")
body = tests.ReadBodyJSON(resp)
assert.Equal(t, resp.StatusCode, 200)
assert.Equal(t, body["activeSize"], 3)
assert.Equal(t, body["removeDelay"], 60)
}
// Create a full cluster, disconnect a peer, wait for autodemotion, wait for autopromotion.
func TestStandbyAutoPromote(t *testing.T) {
t.Skip("functionality unimplemented")
clusterSize := 10 // DefaultActiveSize + 1
_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
if err != nil {
t.Fatal("cannot create cluster")
}
defer func() {
// Wrap this in a closure so that it picks up the updated version of
// the "etcds" variable.
DestroyCluster(etcds)
}()
c := etcd.NewClient(nil)
c.SyncCluster()
time.Sleep(1 * time.Second)
// Verify that we have one standby.
result, err := c.Get("_etcd/standbys", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 1)
// Reconfigure with a short promote delay (2 second).
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":9, "promoteDelay":2}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
// Remove peer.
etcd := etcds[1]
etcds = append(etcds[:1], etcds[2:]...)
if err := etcd.Kill(); err != nil {
panic(err.Error())
}
etcd.Release()
// Wait for it to get dropped.
time.Sleep(server.PeerActivityMonitorTimeout + (2 * time.Second))
// Wait for the standby to be promoted.
time.Sleep(server.ActiveMonitorTimeout + (2 * time.Second))
// Verify that we have 9 peers.
result, err = c.Get("_etcd/machines", true, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 9)
// Verify that node10 is one of those peers.
result, err = c.Get("_etcd/machines/node10", false, false)
assert.NoError(t, err)
// Verify that there are no more standbys.
result, err = c.Get("_etcd/standbys", false, true)
assert.NoError(t, err)
if assert.Equal(t, len(result.Node.Nodes), 1) {
assert.Equal(t, result.Node.Nodes[0].Key, "/_etcd/standbys/node2")
}
}
// Create a full cluster, disconnect a peer, wait for removal, wait for standby join.
func TestStandbyAutoJoin(t *testing.T) {
clusterSize := 5
_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
if err != nil {
t.Fatal("cannot create cluster")
}
defer func() {
// Wrap this in a closure so that it picks up the updated version of
// the "etcds" variable.
DestroyCluster(etcds)
}()
c := etcd.NewClient(nil)
c.SyncCluster()
time.Sleep(1 * time.Second)
// Verify that we have five machines.
result, err := c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 5)
// Reconfigure with a short remove delay (2 second).
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":4, "removeDelay":2, "syncInterval":1}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
// Wait for a monitor cycle before checking for removal.
time.Sleep(server.ActiveMonitorTimeout + (1 * time.Second))
// Verify that we now have four peers.
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 4)
// Remove peer.
etcd := etcds[1]
etcds = append(etcds[:1], etcds[2:]...)
if err := etcd.Kill(); err != nil {
panic(err.Error())
}
etcd.Release()
// Wait for it to get dropped.
time.Sleep(server.PeerActivityMonitorTimeout + (1 * time.Second))
// Wait for the standby to join.
time.Sleep((1 * time.Second) + (1 * time.Second))
// Verify that we have 4 peers.
result, err = c.Get("_etcd/machines", true, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 4)
// Verify that node2 is not one of those peers.
_, err = c.Get("_etcd/machines/node2", false, false)
assert.Error(t, err)
}
func TestStandbyJoinMiss(t *testing.T) {
clusterSize := 2
_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
if err != nil {
t.Fatal("cannot create cluster")
}
defer DestroyCluster(etcds)
c := etcd.NewClient(nil)
c.SyncCluster()
time.Sleep(1 * time.Second)
// Verify that we have two machines.
result, err := c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), clusterSize)
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"removeDelay":4, "syncInterval":4}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
time.Sleep(time.Second)
resp, _ = tests.Delete("http://localhost:7001/v2/admin/machines/node2", "application/json", nil)
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
// Wait for a monitor cycle before checking for removal.
time.Sleep(server.ActiveMonitorTimeout + (1 * time.Second))
// Verify that we now have one peer.
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 1)
// Simulate the join failure
_, err = server.NewClient(nil).AddMachine("http://localhost:7001",
&server.JoinCommand{
MinVersion: store.MinVersion(),
MaxVersion: store.MaxVersion(),
Name: "node2",
RaftURL: "http://127.0.0.1:7002",
EtcdURL: "http://127.0.0.1:4002",
})
assert.NoError(t, err)
time.Sleep(6 * time.Second)
go tests.Delete("http://localhost:7001/v2/admin/machines/node2", "application/json", nil)
time.Sleep(time.Second)
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 1)
}
// Ensure that the cluster configuration can be updated.
func TestClusterConfigSet(t *testing.T) {
_, etcds, err := CreateCluster(3, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
assert.NoError(t, err)
defer DestroyCluster(etcds)
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":3, "removeDelay":60}`))
assert.Equal(t, resp.StatusCode, 200)
time.Sleep(1 * time.Second)
resp, _ = tests.Get("http://localhost:7002/v2/admin/config")
body := tests.ReadBodyJSON(resp)
assert.Equal(t, resp.StatusCode, 200)
assert.Equal(t, body["activeSize"], 3)
assert.Equal(t, body["removeDelay"], 60)
}
// Create a full cluster and then add extra an extra standby node.
func TestStandby(t *testing.T) {
t.Skip("functionality unimplemented")
clusterSize := 10 // DefaultActiveSize + 1
_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
assert.NoError(t, err)
defer DestroyCluster(etcds)
if err != nil {
t.Fatal("cannot create cluster")
}
c := etcd.NewClient(nil)
c.SyncCluster()
// Set key.
time.Sleep(time.Second)
if _, err := c.Set("foo", "bar", 0); err != nil {
panic(err)
}
time.Sleep(time.Second)
// Check that all peers and standbys have the value.
for i := range etcds {
resp, err := tests.Get(fmt.Sprintf("http://localhost:%d/v2/keys/foo", 4000+(i+1)))
if assert.NoError(t, err) {
body := tests.ReadBodyJSON(resp)
if node, _ := body["node"].(map[string]interface{}); assert.NotNil(t, node) {
assert.Equal(t, node["value"], "bar")
}
}
}
// Verify that we have one standby.
result, err := c.Get("_etcd/standbys", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 1)
// Reconfigure with larger active size (10 nodes) and wait for promotion.
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":10, "promoteDelay":1800}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
time.Sleep(server.ActiveMonitorTimeout + (1 * time.Second))
// Verify that the standby node is now a peer.
result, err = c.Get("_etcd/standbys", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 0)
// Reconfigure with a smaller active size (8 nodes).
resp, _ = tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":8, "promoteDelay":1800}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
// Wait for two monitor cycles before checking for demotion.
time.Sleep((2 * server.ActiveMonitorTimeout) + (1 * time.Second))
// Verify that we now have eight peers.
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 8)
// Verify that we now have two standbys.
result, err = c.Get("_etcd/standbys", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 2)
}
// Create a five-node cluster
// Kill all the nodes and restart
func TestMultiNodeKillAllAndRecoveryWithStandbys(t *testing.T) {
procAttr := new(os.ProcAttr)
procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
stop := make(chan bool)
leaderChan := make(chan string, 1)
all := make(chan bool, 1)
clusterSize := 15
argGroup, etcds, err := CreateCluster(clusterSize, procAttr, false)
defer DestroyCluster(etcds)
if err != nil {
t.Fatal("cannot create cluster")
}
c := etcd.NewClient(nil)
go Monitor(clusterSize, clusterSize, leaderChan, all, stop)
<-all
<-leaderChan
stop <- true
c.SyncCluster()
// Reconfigure with smaller active size (7 nodes) and wait for remove.
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":7}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
time.Sleep(2*server.ActiveMonitorTimeout + (1 * time.Second))
// Verify that there is three machines in peer mode.
result, err := c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 7)
// send set commands
for i := 0; i < 2*clusterSize; i++ {
// Test Set
_, err := c.Set("foo", "bar", 0)
if err != nil {
panic(err)
}
}
time.Sleep(time.Second)
// kill all
DestroyCluster(etcds)
time.Sleep(time.Second)
stop = make(chan bool)
leaderChan = make(chan string, 1)
all = make(chan bool, 1)
time.Sleep(time.Second)
for i := 0; i < clusterSize; i++ {
etcds[i], err = os.StartProcess(EtcdBinPath, append(argGroup[i], "-peers="), procAttr)
}
time.Sleep(2 * time.Second)
// send set commands
for i := 0; i < 2*clusterSize; i++ {
// Test Set
_, err := c.Set("foo", "bar", 0)
if err != nil {
t.Fatalf("Recovery error: %s", err)
}
}
// Verify that we have seven machines.
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 7)
}
// Create a full cluster and then change the active size dramatically.
func TestStandbyDramaticChange(t *testing.T) {
clusterSize := 9
_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
assert.NoError(t, err)
defer DestroyCluster(etcds)
if err != nil {
t.Fatal("cannot create cluster")
}
time.Sleep(time.Second)
c := etcd.NewClient(nil)
c.SyncCluster()
num := clusterSize
for i := 0; i < 3; i++ {
for inc := 0; inc < 2; inc++ {
// Verify that we just have i machines.
result, err := c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), num)
if inc == 0 {
num -= 6
} else {
num += 6
}
t.Log("Reconfigure with active size", num)
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(fmt.Sprintf(`{"activeSize":%d, "syncInterval":1}`, num)))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
if inc == 0 {
// Wait for monitor cycles before checking for demotion.
time.Sleep(6*server.ActiveMonitorTimeout + (1 * time.Second))
} else {
time.Sleep(time.Second + (1 * time.Second))
}
// Verify that we now have peers.
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), num)
t.Log("Test the functionality of all servers")
// Set key.
if _, err := c.Set("foo", "bar", 0); err != nil {
panic(err)
}
time.Sleep(100 * time.Millisecond)
// Check that all peers and standbys have the value.
for i := range etcds {
resp, err := tests.Get(fmt.Sprintf("http://localhost:%d/v2/keys/foo", 4000+(i+1)))
if assert.NoError(t, err) {
body := tests.ReadBodyJSON(resp)
if node, _ := body["node"].(map[string]interface{}); assert.NotNil(t, node) {
assert.Equal(t, node["value"], "bar")
}
}
}
}
}
}
// Create a full cluster and then change the active size.
func TestStandby(t *testing.T) {
clusterSize := 15
_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
if !assert.NoError(t, err) {
t.Fatal("cannot create cluster")
}
defer DestroyCluster(etcds)
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"syncInterval":1}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
time.Sleep(time.Second)
c := etcd.NewClient(nil)
c.SyncCluster()
// Verify that we just have default machines.
result, err := c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 9)
t.Log("Reconfigure with a smaller active size")
resp, _ = tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":7, "syncInterval":1}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
// Wait for two monitor cycles before checking for demotion.
time.Sleep((2 * server.ActiveMonitorTimeout) + (2 * time.Second))
// Verify that we now have seven peers.
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 7)
t.Log("Test the functionality of all servers")
// Set key.
time.Sleep(time.Second)
if _, err := c.Set("foo", "bar", 0); err != nil {
panic(err)
}
time.Sleep(time.Second)
// Check that all peers and standbys have the value.
for i := range etcds {
resp, err := tests.Get(fmt.Sprintf("http://localhost:%d/v2/keys/foo", 4000+(i+1)))
if assert.NoError(t, err) {
body := tests.ReadBodyJSON(resp)
if node, _ := body["node"].(map[string]interface{}); assert.NotNil(t, node) {
assert.Equal(t, node["value"], "bar")
}
}
}
t.Log("Reconfigure with larger active size and wait for join")
resp, _ = tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":8, "syncInterval":1}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
time.Sleep((1 * time.Second) + (1 * time.Second))
// Verify that exactly eight machines are in the cluster.
result, err = c.Get("_etcd/machines", false, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 8)
}
// This test will kill the current leader and wait for the etcd cluster to elect a new leader for 200 times.
// It will print out the election time and the average election time.
// It runs in a cluster with standby nodes.
func TestKillLeaderWithStandbys(t *testing.T) {
// https://github.com/goraft/raft/issues/222
t.Skip("stuck on raft issue")
procAttr := new(os.ProcAttr)
procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
clusterSize := 5
argGroup, etcds, err := CreateCluster(clusterSize, procAttr, false)
if err != nil {
t.Fatal("cannot create cluster")
}
defer DestroyCluster(etcds)
stop := make(chan bool)
leaderChan := make(chan string, 1)
all := make(chan bool, 1)
time.Sleep(time.Second)
go Monitor(clusterSize, 1, leaderChan, all, stop)
c := etcd.NewClient(nil)
c.SyncCluster()
// Reconfigure with a small active size.
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":3, "removeDelay":2, "syncInterval":1}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
// Wait for two monitor cycles before checking for demotion.
time.Sleep((2 * server.ActiveMonitorTimeout) + (2 * time.Second))
// Verify that we have 3 peers.
result, err := c.Get("_etcd/machines", true, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 3)
var totalTime time.Duration
leader := "http://127.0.0.1:7001"
for i := 0; i < clusterSize; i++ {
t.Log("leader is ", leader)
port, _ := strconv.Atoi(strings.Split(leader, ":")[2])
num := port - 7001
t.Log("kill server ", num)
etcds[num].Kill()
etcds[num].Release()
start := time.Now()
for {
newLeader := <-leaderChan
if newLeader != leader {
leader = newLeader
break
}
}
take := time.Now().Sub(start)
totalTime += take
avgTime := totalTime / (time.Duration)(i+1)
fmt.Println("Total time:", totalTime, "; Avg time:", avgTime)
time.Sleep(server.ActiveMonitorTimeout + (1 * time.Second))
time.Sleep(2 * time.Second)
// Verify that we have 3 peers.
result, err = c.Get("_etcd/machines", true, true)
assert.NoError(t, err)
assert.Equal(t, len(result.Node.Nodes), 3)
// Verify that killed node is not one of those peers.
_, err = c.Get(fmt.Sprintf("_etcd/machines/node%d", num+1), false, false)
assert.Error(t, err)
etcds[num], err = os.StartProcess(EtcdBinPath, argGroup[num], procAttr)
}
stop <- true
}
// remove the node and node rejoin with previous log
func TestRemoveNode(t *testing.T) {
procAttr := new(os.ProcAttr)
procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
clusterSize := 4
argGroup, etcds, _ := CreateCluster(clusterSize, procAttr, false)
defer DestroyCluster(etcds)
time.Sleep(time.Second)
c := etcd.NewClient(nil)
c.SyncCluster()
resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":4, "syncInterval":5}`))
if !assert.Equal(t, resp.StatusCode, 200) {
t.FailNow()
}
rmReq, _ := http.NewRequest("DELETE", "http://127.0.0.1:7001/remove/node3", nil)
client := &http.Client{}
for i := 0; i < 2; i++ {
for i := 0; i < 2; i++ {
client.Do(rmReq)
fmt.Println("send remove to node3 and wait for its exiting")
time.Sleep(100 * time.Millisecond)
resp, err := c.Get("_etcd/machines", false, false)
if err != nil {
panic(err)
}
if len(resp.Node.Nodes) != 3 {
t.Fatal("cannot remove peer")
}
etcds[2].Kill()
etcds[2].Wait()
if i == 1 {
// rejoin with log
etcds[2], err = os.StartProcess(EtcdBinPath, argGroup[2], procAttr)
} else {
// rejoin without log
etcds[2], err = os.StartProcess(EtcdBinPath, append(argGroup[2], "-f"), procAttr)
}
if err != nil {
panic(err)
}
time.Sleep(time.Second + 5*time.Second)
resp, err = c.Get("_etcd/machines", false, false)
if err != nil {
panic(err)
}
if len(resp.Node.Nodes) != 4 {
t.Fatalf("add peer fails #1 (%d != 4)", len(resp.Node.Nodes))
}
}
// first kill the node, then remove it, then add it back
for i := 0; i < 2; i++ {
etcds[2].Kill()
fmt.Println("kill node3 and wait for its exiting")
etcds[2].Wait()
client.Do(rmReq)
time.Sleep(100 * time.Millisecond)
resp, err := c.Get("_etcd/machines", false, false)
if err != nil {
panic(err)
}
if len(resp.Node.Nodes) != 3 {
t.Fatal("cannot remove peer")
}
if i == 1 {
// rejoin with log
etcds[2], err = os.StartProcess(EtcdBinPath, append(argGroup[2]), procAttr)
} else {
// rejoin without log
etcds[2], err = os.StartProcess(EtcdBinPath, append(argGroup[2], "-f"), procAttr)
}
if err != nil {
panic(err)
}
time.Sleep(time.Second + time.Second)
resp, err = c.Get("_etcd/machines", false, false)
if err != nil {
panic(err)
}
if len(resp.Node.Nodes) != 4 {
t.Fatalf("add peer fails #2 (%d != 4)", len(resp.Node.Nodes))
}
}
}
}
func TestRemovePausedNode(t *testing.T) {
procAttr := new(os.ProcAttr)
procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
clusterSize := 4
_, etcds, _ := CreateCluster(clusterSize, procAttr, false)
defer DestroyCluster(etcds)
time.Sleep(time.Second)
c := etcd.NewClient(nil)
c.SyncCluster()
r, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"activeSize":3, "removeDelay":1, "syncInterval":1}`))
if !assert.Equal(t, r.StatusCode, 200) {
t.FailNow()
}
// Wait for standby instances to update its cluster config
time.Sleep(6 * time.Second)
resp, err := c.Get("_etcd/machines", false, false)
if err != nil {
panic(err)
}
if len(resp.Node.Nodes) != 3 {
t.Fatal("cannot remove peer")
}
for i := 0; i < clusterSize; i++ {
// first pause the node, then remove it, then resume it
idx := rand.Int() % clusterSize
etcds[idx].Signal(syscall.SIGSTOP)
fmt.Printf("pause node%d and let standby node take its place\n", idx+1)
time.Sleep(4 * time.Second)
etcds[idx].Signal(syscall.SIGCONT)
// let it change its state to candidate at least
time.Sleep(time.Second)
stop := make(chan bool)
leaderChan := make(chan string, 1)
all := make(chan bool, 1)
go Monitor(clusterSize, clusterSize, leaderChan, all, stop)
<-all
<-leaderChan
stop <- true
resp, err = c.Get("_etcd/machines", false, false)
if err != nil {
panic(err)
}
if len(resp.Node.Nodes) != 3 {
t.Fatalf("add peer fails (%d != 3)", len(resp.Node.Nodes))
}
for i := 0; i < 3; i++ {
if resp.Node.Nodes[i].Key == fmt.Sprintf("node%d", idx+1) {
t.Fatal("node should be removed")
}
}
}
}