etcd-tester: add compactKV

It compacts storage for every case.
For https://github.com/coreos/etcd/issues/4380.

tools/functional-tester/etcd-tester/stresser.go

@@ -79,7 +79,6 @@ func (s *stresser) Stress() error {
 				})
 				putcancel()
 				if grpc.ErrorDesc(err) == context.Canceled.Error() {
-					log.Printf("etcd-tester: stresser#%d is cancelled", i)
 					return
 				}
 				s.mu.Lock()

tools/functional-tester/etcd-tester/tester.go

@@ -55,6 +55,7 @@ func (tt *tester) runLoop() {
 				continue
 			}
 			log.Printf("etcd-tester: [round#%d case#%d] start failure %s", i, j, f.Desc())
+
 			log.Printf("etcd-tester: [round#%d case#%d] start injecting failure...", i, j)
 			if err := f.Inject(tt.cluster, i); err != nil {
 				log.Printf("etcd-tester: [round#%d case#%d] injection error: %v", i, j, err)
@@ -64,6 +65,8 @@ func (tt *tester) runLoop() {
 				}
 				continue
 			}
+			log.Printf("etcd-tester: [round#%d case#%d] injected failure", i, j)
+
 			log.Printf("etcd-tester: [round#%d case#%d] start recovering failure...", i, j)
 			if err := f.Recover(tt.cluster, i); err != nil {
 				log.Printf("etcd-tester: [round#%d case#%d] recovery error: %v", i, j, err)
@@ -73,6 +76,7 @@ func (tt *tester) runLoop() {
 				}
 				continue
 			}
+			log.Printf("etcd-tester: [round#%d case#%d] recovered failure", i, j)
 
 			if tt.cluster.v2Only {
 				log.Printf("etcd-tester: [round#%d case#%d] succeed!", i, j)
@@ -83,25 +87,26 @@ func (tt *tester) runLoop() {
 			for _, s := range tt.cluster.Stressers {
 				s.Cancel()
 			}
+			log.Printf("etcd-tester: [round#%d case#%d] canceled stressers", i, j)
 
+			log.Printf("etcd-tester: [round#%d case#%d] checking current revisions...", i, j)
 			ok := false
+			var currentRevision int64
 			for k := 0; k < 5; k++ {
 				time.Sleep(time.Second)
-				log.Printf("etcd-tester: [round#%d case#%d.%d] checking current revisions...", i, j, k)
 				revs, err := tt.cluster.getRevision()
 				if err != nil {
 					if e := tt.cleanup(i, j); e != nil {
 						log.Printf("etcd-tester: [round#%d case#%d.%d] cleanup error: %v", i, j, k, e)
 						return
 					}
-					log.Printf("etcd-tester: [round#%d case#%d.%d] failed to get revisions (%v)", i, j, k, err)
+					log.Printf("etcd-tester: [round#%d case#%d.%d] failed to get current revisions (%v)", i, j, k, err)
 					continue
 				}
-				if ok = isSameValueInMap(revs); ok {
+				if currentRevision, ok = getSameValue(revs); ok {
-					log.Printf("etcd-tester: [round#%d case#%d.%d] checking current revisions succeed!", i, j, k)
 					break
 				} else {
-					log.Printf("etcd-tester: [round#%d case#%d.%d] current revisions %+v", i, j, k, revs)
+					log.Printf("etcd-tester: [round#%d case#%d.%d] inconsistent current revisions %+v", i, j, k, revs)
 				}
 			}
 			if !ok {
@@ -112,6 +117,7 @@ func (tt *tester) runLoop() {
 				}
 				continue
 			}
+			log.Printf("etcd-tester: [round#%d case#%d] all members are consistent with current revisions", i, j)
 
 			log.Printf("etcd-tester: [round#%d case#%d] checking current storage hashes...", i, j)
 			hashes, err := tt.cluster.getKVHash()
@@ -122,20 +128,32 @@ func (tt *tester) runLoop() {
 					return
 				}
 			}
-			if !isSameValueInMap(hashes) {
+			if _, ok = getSameValue(hashes); !ok {
 				if err := tt.cleanup(i, j); err != nil {
 					log.Printf("etcd-tester: [round#%d case#%d] cleanup error: %v", i, j, err)
 					return
 				}
 				continue
 			}
-			log.Printf("etcd-tester: [round#%d case#%d] all members are consistent!", i, j)
+			log.Printf("etcd-tester: [round#%d case#%d] all members are consistent with storage hashes", i, j)
-			log.Printf("etcd-tester: [round#%d case#%d] succeed!", i, j)
+
+			revToCompact := max(0, currentRevision-10000)
+			log.Printf("etcd-tester: [round#%d case#%d] compacting storage at %d (current revision %d)", i, j, revToCompact, currentRevision)
+			if err := tt.cluster.compactKV(revToCompact); err != nil {
+				log.Printf("etcd-tester: [round#%d case#%d] compactKV error (%v)", i, j, err)
+				if err := tt.cleanup(i, j); err != nil {
+					log.Printf("etcd-tester: [round#%d case#%d] cleanup error: %v", i, j, err)
+					return
+				}
+			}
+			log.Printf("etcd-tester: [round#%d case#%d] compacted storage", i, j)
 
 			log.Printf("etcd-tester: [round#%d case#%d] restarting the stressers...", i, j)
 			for _, s := range tt.cluster.Stressers {
 				go s.Stress()
 			}
+
+			log.Printf("etcd-tester: [round#%d case#%d] succeed!", i, j)
 		}
 	}
 }
@@ -221,7 +239,7 @@ func (c *cluster) getKVHash() (map[string]int64, error) {
 	return hashes, nil
 }
 
-func isSameValueInMap(hashes map[string]int64) bool {
+func getSameValue(hashes map[string]int64) (int64, bool) {
 	var rv int64
 	ok := true
 	for _, v := range hashes {
@@ -233,5 +251,33 @@ func isSameValueInMap(hashes map[string]int64) bool {
 			break
 		}
 	}
-	return ok
+	return rv, ok
+}
+
+func max(n1, n2 int64) int64 {
+	if n1 > n2 {
+		return n1
+	}
+	return n2
+}
+
+func (c *cluster) compactKV(rev int64) error {
+	var (
+		conn *grpc.ClientConn
+		err  error
+	)
+	for _, u := range c.GRPCURLs {
+		conn, err = grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
+		if err != nil {
+			continue
+		}
+		kvc := pb.NewKVClient(conn)
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		_, err = kvc.Compact(ctx, &pb.CompactionRequest{Revision: rev})
+		cancel()
+		if err == nil {
+			return nil
+		}
+	}
+	return err
 }