tools/functional-tester: better logging

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

@@ -160,6 +160,7 @@ type stresser struct {
 	conn   *grpc.ClientConn
 
 	success int
+	failure int
 
 	stressTable *stressTable
 }
@@ -219,7 +220,10 @@ func (s *stresser) run(ctx context.Context) {
 		scancel()
 
 		if err != nil {
-			shouldContinue := false
+			s.mu.Lock()
+			s.failure++
+			s.mu.Unlock()
+
 			switch grpc.ErrorDesc(err) {
 			case context.DeadlineExceeded.Error():
 				// This retries when request is triggered at the same time as
@@ -228,37 +232,45 @@ func (s *stresser) run(ctx context.Context) {
 				// to followers cannot be forwarded to the old leader, so timing out
 				// as well. We want to keep stressing until the cluster elects a
 				// new leader and start processing requests again.
-				shouldContinue = true
+				continue
 
 			case etcdserver.ErrTimeoutDueToLeaderFail.Error(), etcdserver.ErrTimeout.Error():
 				// This retries when request is triggered at the same time as
 				// leader failure and follower nodes receive time out errors
 				// from losing their leader. Followers should retry to connect
 				// to the new leader.
-				shouldContinue = true
+				continue
 
 			case etcdserver.ErrStopped.Error():
 				// one of the etcd nodes stopped from failure injection
-				shouldContinue = true
+				continue
 
 			case transport.ErrConnClosing.Desc:
 				// server closed the transport (failure injected node)
-				shouldContinue = true
+				continue
 
 			case rpctypes.ErrNotCapable.Error():
 				// capability check has not been done (in the beginning)
-				shouldContinue = true
+				continue
 
 				// default:
 				// errors from stresser.Cancel method:
 				// rpc error: code = 1 desc = context canceled (type grpc.rpcError)
 				// rpc error: code = 2 desc = grpc: the client connection is closing (type grpc.rpcError)
-			}
-			if shouldContinue {
+			case rpctypes.ErrTooManyRequests.Error():
+				// hitting the recovering member.
 				continue
+
+			case context.Canceled.Error():
+				return
 			}
+
+			su, fa := s.Report()
+			plog.Warningf("stresser %v (success %d, failure %d) exited with error (%v)", s.Endpoint, su, fa, err)
+
 			return
 		}
+
 		s.mu.Lock()
 		s.success++
 		s.mu.Unlock()
@@ -279,8 +291,7 @@ func (s *stresser) Cancel() {
 func (s *stresser) Report() (int, int) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	// TODO: find a better way to report v3 tests
-	return s.success, -1
+	return s.success, s.failure
 }
 
 type stresserV2 struct {