etcd-tester: return error if first compaction times out

Fixes #5081

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

@@ -320,30 +320,27 @@ func (c *cluster) getRevisionHash() (map[string]int64, map[string]int64, error)
 	return revs, hashes, nil
 }
 
-func (c *cluster) compactKV(rev int64) error {
-	var (
-		conn *grpc.ClientConn
-		err  error
-	)
-
+func (c *cluster) compactKV(rev int64) (err error) {
 	if rev <= 0 {
 		return nil
 	}
 
 	for i, u := range c.GRPCURLs {
-		conn, err = grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
-		if err != nil {
+		conn, derr := grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
+		if derr != nil {
+			err = derr
 			continue
 		}
 		kvc := pb.NewKVClient(conn)
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		_, err = kvc.Compact(ctx, &pb.CompactionRequest{Revision: rev, Physical: true})
+		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+		_, cerr := kvc.Compact(ctx, &pb.CompactionRequest{Revision: rev, Physical: true})
 		cancel()
 		conn.Close()
-		if err != nil {
+		if cerr != nil {
 			if strings.Contains(err.Error(), "required revision has been compacted") && i > 0 {
-				plog.Printf("%s is already compacted with %d (%v)", u, rev, err)
-				err = nil // in case compact was requested more than once
+				plog.Printf("%s is already compacted with %d (%v)", u, rev, cerr)
+			} else {
+				err = cerr
 			}
 		}
 	}