122 lines
3.7 KiB
Go
122 lines
3.7 KiB
Go
// Copyright 2018 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package integration
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import (
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"context"
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"fmt"
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"testing"
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"time"
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pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
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)
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// TestV3WatchRestoreSnapshotUnsync tests whether slow follower can restore
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// from leader snapshot, and still notify on watchers from an old revision
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// that were created in synced watcher group in the first place.
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// TODO: fix panic with gRPC proxy "panic: watcher current revision should not exceed current revision"
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func TestV3WatchRestoreSnapshotUnsync(t *testing.T) {
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clus := NewClusterV3(t, &ClusterConfig{
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Size: 3,
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SnapshotCount: 10,
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SnapshotCatchUpEntries: 5,
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})
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defer clus.Terminate(t)
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// spawn a watcher before shutdown, and put it in synced watcher
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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wStream, errW := toGRPC(clus.Client(0)).Watch.Watch(ctx)
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if errW != nil {
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t.Fatal(errW)
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}
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if err := wStream.Send(&pb.WatchRequest{RequestUnion: &pb.WatchRequest_CreateRequest{
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CreateRequest: &pb.WatchCreateRequest{Key: []byte("foo"), StartRevision: 5}}}); err != nil {
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t.Fatalf("wStream.Send error: %v", err)
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}
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wresp, errR := wStream.Recv()
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if errR != nil {
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t.Errorf("wStream.Recv error: %v", errR)
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}
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if !wresp.Created {
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t.Errorf("wresp.Created got = %v, want = true", wresp.Created)
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}
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clus.Members[0].InjectPartition(t, clus.Members[1:]...)
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clus.waitLeader(t, clus.Members[1:])
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time.Sleep(2 * time.Second)
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kvc := toGRPC(clus.Client(1)).KV
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// to trigger snapshot from the leader to the stopped follower
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for i := 0; i < 15; i++ {
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_, err := kvc.Put(context.TODO(), &pb.PutRequest{Key: []byte("foo"), Value: []byte("bar")})
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if err != nil {
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t.Errorf("#%d: couldn't put key (%v)", i, err)
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}
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}
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// trigger snapshot send from leader to this slow follower
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// which then calls watchable store Restore
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clus.Members[0].RecoverPartition(t, clus.Members[1:]...)
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lead := clus.WaitLeader(t)
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sends, err := clus.Members[lead].Metric("etcd_network_snapshot_send_inflights_total")
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if err != nil {
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t.Fatal(err)
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}
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if sends != "0" && sends != "1" {
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// 0 if already sent, 1 if sending
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t.Fatalf("inflight snapshot sends expected 0 or 1, got %q", sends)
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}
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receives, err := clus.Members[(lead+1)%3].Metric("etcd_network_snapshot_receive_inflights_total")
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if err != nil {
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t.Fatal(err)
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}
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if receives != "0" && receives != "1" {
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// 0 if already received, 1 if receiving
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t.Fatalf("inflight snapshot receives expected 0 or 1, got %q", receives)
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}
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time.Sleep(2 * time.Second)
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// slow follower now applies leader snapshot
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// should be able to notify on old-revision watchers in unsynced
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// make sure restore watch operation correctly moves watchers
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// between synced and unsynced watchers
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errc := make(chan error)
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go func() {
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cresp, cerr := wStream.Recv()
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if cerr != nil {
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errc <- cerr
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return
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}
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// from start revision 5 to latest revision 16
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if len(cresp.Events) != 12 {
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errc <- fmt.Errorf("expected 12 events, got %+v", cresp.Events)
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return
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}
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errc <- nil
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}()
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select {
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case <-time.After(10 * time.Second):
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t.Fatal("took too long to receive events from restored watcher")
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case err := <-errc:
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if err != nil {
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t.Fatalf("wStream.Recv error: %v", err)
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}
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}
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}
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