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Signed-off-by: Chao Chen <chaochn@amazon.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright 2023 The etcd 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 v3rpc | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "go.etcd.io/raft/v3" | ||
| "go.uber.org/zap" | ||
| "google.golang.org/grpc/health" | ||
| healthpb "google.golang.org/grpc/health/grpc_health_v1" | ||
|
|
||
| "go.etcd.io/etcd/api/v3/etcdserverpb" | ||
| "go.etcd.io/etcd/client/pkg/v3/types" | ||
| "go.etcd.io/etcd/server/v3/auth" | ||
| "go.etcd.io/etcd/server/v3/etcdserver" | ||
| ) | ||
|
|
||
| type healthNotifier interface { | ||
| StartServe() | ||
| StopServe(reason string) | ||
| } | ||
|
|
||
| type healthChecker struct { | ||
| hs *health.Server | ||
| served bool | ||
|
|
||
| // implements readyz prober | ||
| s *etcdserver.EtcdServer | ||
| // prober configuration TODO 2023-09-13 externalize as etcd server flag | ||
| successThreshold int | ||
| failureThreshold int | ||
| healthCheckInterval time.Duration | ||
| // prober state | ||
| successCount int | ||
| failureCount int | ||
| } | ||
|
|
||
| func NewHealthChecker(hs *health.Server, s *etcdserver.EtcdServer) healthNotifier { | ||
| hc := &healthChecker{hs: hs, s: s, successThreshold: 2, failureThreshold: 3, healthCheckInterval: 100 * time.Millisecond} | ||
| // set grpc health server as serving status blindly since | ||
| // the grpc server will serve iff s.ReadyNotify() is closed. | ||
| hc.StartServe() | ||
|
|
||
| go hc.startProbe() | ||
| return hc | ||
| } | ||
|
|
||
| func (hc *healthChecker) StartServe() { | ||
| if hc.hs != nil { | ||
| if hc.s.Logger() != nil { | ||
| hc.s.Logger().Info("start serving gRPC requests from client") | ||
| } | ||
| hc.hs.SetServingStatus("", healthpb.HealthCheckResponse_SERVING) | ||
| hc.served = true | ||
| } | ||
| } | ||
|
|
||
| func (hc *healthChecker) StopServe(reason string) { | ||
| if hc.hs != nil { | ||
| if hc.s.Logger() != nil { | ||
| hc.s.Logger().Warn("stop serving gRPC requests from client", zap.String("reason", reason)) | ||
| } | ||
| hc.hs.SetServingStatus("", healthpb.HealthCheckResponse_NOT_SERVING) | ||
| hc.served = false | ||
| } | ||
| } | ||
|
|
||
| func (hc *healthChecker) startProbe() { | ||
| // stop probing if there is no consumer. | ||
| if hc.hs == nil { | ||
| return | ||
| } | ||
|
|
||
| ticker := time.NewTicker(hc.healthCheckInterval) | ||
| defer ticker.Stop() | ||
| for { | ||
| select { | ||
| case <-hc.s.StoppingNotify(): | ||
| return | ||
| case <-ticker.C: | ||
| if ready, notReadyReason := checkReadyz(hc.s, 2*time.Second); ready { | ||
| hc.successCount += 1 | ||
| hc.failureCount = 0 | ||
| if hc.successCount >= hc.successThreshold && !hc.served { | ||
| hc.StartServe() | ||
| } | ||
| } else { | ||
| hc.failureCount += 1 | ||
| hc.successCount = 0 | ||
| hc.s.Logger().Warn("readyz check failed", zap.Int("failure-count", hc.failureCount)) | ||
| if hc.failureCount >= hc.failureThreshold && hc.served { | ||
| hc.StopServe(notReadyReason) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // checkReadyz prober implementation should be in sync with readyz design in the future. | ||
| // https://docs.google.com/document/d/1109lUxD326yRwmMVX-tkJMpm8pTbOw7MD1XsSIo37MU | ||
| // it is now in sync with etcdhttp.HandleHealth implementation | ||
| // 1. checkLeader | ||
| // 2. checkAlarms | ||
| // 3. checkQuorumRead | ||
| func checkReadyz(s *etcdserver.EtcdServer, timeout time.Duration) (ready bool, notReadyReason string) { | ||
| if s.Leader() == types.ID(raft.None) { | ||
| return false, "local member does not have leader" | ||
| } | ||
| for _, alarm := range s.Alarms() { | ||
| if types.ID(alarm.MemberID) == s.MemberId() && alarm.Alarm == etcdserverpb.AlarmType_CORRUPT { | ||
| return false, "local member has corrupt alarm" | ||
| } | ||
| } | ||
| ctx, cancel := context.WithTimeout(context.Background(), timeout) | ||
| // range requests will only be timed-out in the LinearizableReadNotify phase, and | ||
| // blocking in the mvcc phase in case of defrag. | ||
| // However, use solely LinearizableReadNotify to indicate readyz will produce false positive serving status when defrag is active. | ||
| _, err := s.Range(ctx, &etcdserverpb.RangeRequest{KeysOnly: true, Limit: 1}) | ||
| cancel() | ||
| if err != nil && err != auth.ErrUserEmpty && err != auth.ErrPermissionDenied { | ||
| return false, fmt.Sprintf("local member quorum read with %s timeout failed due to %v", timeout.String(), err) | ||
| } | ||
| return true, "" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| // Copyright 2023 The etcd 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 e2e | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| "google.golang.org/grpc" | ||
|
|
||
| clientv3 "go.etcd.io/etcd/client/v3" | ||
| "go.etcd.io/etcd/tests/v3/framework/config" | ||
| "go.etcd.io/etcd/tests/v3/framework/e2e" | ||
| ) | ||
|
|
||
| const ( | ||
| // in sync with how kubernetes uses etcd | ||
| // https://github.com/kubernetes/kubernetes/blob/release-1.28/staging/src/k8s.io/apiserver/pkg/storage/storagebackend/factory/etcd3.go#L59-L71 | ||
| keepaliveTime = 30 * time.Second | ||
| keepaliveTimeout = 10 * time.Second | ||
| dialTimeout = 20 * time.Second | ||
|
|
||
| clientRuntime = 10 * time.Second | ||
| failureDetectionLatency = 6 * time.Second | ||
| // expect no more than 5 failed requests | ||
| failedRequests = 5 | ||
| ) | ||
|
|
||
| func TestFailover(t *testing.T) { | ||
| tcs := []struct { | ||
| name string | ||
| clusterOptions []e2e.EPClusterOption | ||
| failureInjector func(t *testing.T, clus *e2e.EtcdProcessCluster) | ||
| failureDetectionLatency time.Duration | ||
| }{ | ||
| { | ||
| name: "network_partition", | ||
| clusterOptions: []e2e.EPClusterOption{e2e.WithClusterSize(3), e2e.WithIsPeerTLS(true), e2e.WithPeerProxy(true)}, | ||
| failureInjector: blackhole, | ||
| failureDetectionLatency: failureDetectionLatency, | ||
| }, | ||
| { | ||
| name: "stalled_disk_write", | ||
| clusterOptions: []e2e.EPClusterOption{e2e.WithClusterSize(3), e2e.WithGoFailEnabled(true)}, | ||
| failureInjector: blockDiskWrite, | ||
| failureDetectionLatency: failureDetectionLatency, | ||
| }, | ||
| { | ||
| name: "defrag", | ||
| clusterOptions: []e2e.EPClusterOption{e2e.WithClusterSize(3), e2e.WithGoFailEnabled(true)}, | ||
| failureInjector: triggerDefrag, | ||
| }, | ||
| } | ||
|
|
||
| for _, tc := range tcs { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| e2e.BeforeTest(t) | ||
| clus, err := e2e.NewEtcdProcessCluster(context.TODO(), t, tc.clusterOptions...) | ||
| t.Cleanup(func() { clus.Stop() }) | ||
| endpoints := clus.EndpointsGRPC() | ||
|
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| cnt, success := 0, 0 | ||
| donec := make(chan struct{}) | ||
| errc := make(chan error, 1) | ||
|
|
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| go func() { | ||
| var lastErr error | ||
| var cc *clientv3.Client | ||
| defer func() { | ||
| if cc != nil { | ||
| cc.Close() | ||
| } | ||
| errc <- lastErr | ||
| close(donec) | ||
| close(errc) | ||
| }() | ||
| cc, cerr := clientv3.New(clientv3.Config{ | ||
| DialTimeout: dialTimeout, | ||
| DialKeepAliveTime: keepaliveTime, | ||
| DialKeepAliveTimeout: keepaliveTimeout, | ||
| Endpoints: endpoints, | ||
| DialOptions: []grpc.DialOption{ | ||
| grpc.WithDisableServiceConfig(), | ||
| grpc.WithDefaultServiceConfig(`{"loadBalancingPolicy": "round_robin", "healthCheckConfig": {"serviceName": ""}}`), | ||
| // the following service config will disable grpc client health check | ||
| //grpc.WithDefaultServiceConfig(`{"loadBalancingPolicy": "round_robin"}`), | ||
| }, | ||
| }) | ||
| require.NoError(t, cerr) | ||
| timeout := time.After(clientRuntime) | ||
|
|
||
| time.Sleep(tc.failureDetectionLatency) | ||
| for { | ||
| select { | ||
| case <-timeout: | ||
| return | ||
| default: | ||
| } | ||
| cctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond) | ||
| //start := time.Now() | ||
| _, err = cc.Get(cctx, "health") | ||
| //t.Logf("TS (%s): number #%d health check took %v", time.Now().UTC().Format(time.RFC3339), cnt, time.Since(start)) | ||
| cancel() | ||
| cnt++ | ||
| if err != nil { | ||
| lastErr = err | ||
| continue | ||
| } | ||
| success++ | ||
| } | ||
| }() | ||
|
|
||
| tc.failureInjector(t, clus) | ||
|
|
||
| <-donec | ||
| err, ok := <-errc | ||
| if ok && err != nil { | ||
| t.Logf("etcd client failed to fail over, error (%v)", err) | ||
| } | ||
| t.Logf("request failure rate is %.2f%%, traffic volume success %d requests, total %d requests", (1-float64(success)/float64(cnt))*100, success, cnt) | ||
| // expect no more than 5 failed requests | ||
| require.InDelta(t, cnt, success, failedRequests) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func blackhole(t *testing.T, clus *e2e.EtcdProcessCluster) { | ||
| member := clus.Procs[0] | ||
| proxy := member.PeerProxy() | ||
| t.Logf("Blackholing traffic from and to member %q", member.Config().Name) | ||
| proxy.BlackholeTx() | ||
| proxy.BlackholeRx() | ||
| } | ||
|
|
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| func blockDiskWrite(t *testing.T, clus *e2e.EtcdProcessCluster) { | ||
| err := clus.Procs[0].Failpoints().Setup(context.Background(), "raftBeforeSave", `sleep(10000)`) | ||
| require.NoError(t, err) | ||
| clus.Procs[0].Etcdctl().Put(context.Background(), "foo", "bar", config.PutOptions{}) | ||
| } | ||
|
|
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| func triggerDefrag(t *testing.T, clus *e2e.EtcdProcessCluster) { | ||
| err := clus.Procs[0].Failpoints().Setup(context.Background(), "defragBeforeCopy", `sleep(8000)`) | ||
| require.NoError(t, err) | ||
| err = clus.Procs[0].Etcdctl().Defragment(context.Background(), config.DefragOption{Timeout: time.Minute}) | ||
| require.NoError(t, err) | ||
| } |