Fix missing decision timeout for transient decisions

We were using incorrect scheduleID for transient decisions on decision
started event.  This happens if a new event comes in after a transient
decision is scheduled, but before it is started.  We end up a creating a
timeout task with the wrong decision schedule id causing timer
processing to skip that timeout event.
Also added an integration test for this use case.

host/integration_test.go

@@ -6146,6 +6146,109 @@ func (s *integrationSuite) TestSignalWithStartWorkflow() {
 	s.Equal(identity, *signalEvent.WorkflowExecutionSignaledEventAttributes.Identity)
 }
 
+func (s *integrationSuite) TestTransientDecisionTimeout() {
+	id := "integration-transient-decision-timeout-test"
+	wt := "integration-transient-decision-timeout-test-type"
+	tl := "integration-transient-decision-timeout-test-tasklist"
+	identity := "worker1"
+
+	workflowType := &workflow.WorkflowType{}
+	workflowType.Name = common.StringPtr(wt)
+
+	taskList := &workflow.TaskList{}
+	taskList.Name = common.StringPtr(tl)
+
+	// Start workflow execution
+	request := &workflow.StartWorkflowExecutionRequest{
+		RequestId:    common.StringPtr(uuid.New()),
+		Domain:       common.StringPtr(s.domainName),
+		WorkflowId:   common.StringPtr(id),
+		WorkflowType: workflowType,
+		TaskList:     taskList,
+		Input:        nil,
+		ExecutionStartToCloseTimeoutSeconds: common.Int32Ptr(100),
+		TaskStartToCloseTimeoutSeconds:      common.Int32Ptr(2),
+		Identity:                            common.StringPtr(identity),
+	}
+
+	we, err0 := s.engine.StartWorkflowExecution(createContext(), request)
+	s.Nil(err0)
+	s.logger.Infof("StartWorkflowExecution: response: %v \n", *we.RunId)
+
+	workflowExecution := &workflow.WorkflowExecution{
+		WorkflowId: common.StringPtr(id),
+		RunId:      common.StringPtr(*we.RunId),
+	}
+
+	// decider logic
+	workflowComplete := false
+	failDecision := true
+	signalCount := 0
+	//var signalEvent *workflow.HistoryEvent
+	dtHandler := func(execution *workflow.WorkflowExecution, wt *workflow.WorkflowType,
+		previousStartedEventID, startedEventID int64, history *workflow.History) ([]byte, []*workflow.Decision, error) {
+		if failDecision {
+			failDecision = false
+			return nil, nil, errors.New("Decider Panic")
+		}
+
+		// Count signals
+		for _, event := range history.Events[previousStartedEventID:] {
+			if event.GetEventType() == workflow.EventTypeWorkflowExecutionSignaled {
+				signalCount++
+			}
+		}
+
+
+		workflowComplete = true
+		return nil, []*workflow.Decision{{
+			DecisionType: common.DecisionTypePtr(workflow.DecisionTypeCompleteWorkflowExecution),
+			CompleteWorkflowExecutionDecisionAttributes: &workflow.CompleteWorkflowExecutionDecisionAttributes{
+				Result: []byte("Done."),
+			},
+		}}, nil
+	}
+
+	poller := &taskPoller{
+		engine:          s.engine,
+		domain:          s.domainName,
+		taskList:        taskList,
+		identity:        identity,
+		decisionHandler: dtHandler,
+		activityHandler: nil,
+		logger:          s.logger,
+		suite:           s,
+	}
+
+	// First decision immediately fails and schedules a transient decision
+	_, err := poller.pollAndProcessDecisionTask(false, false)
+	s.logger.Infof("pollAndProcessDecisionTask: %v", err)
+	s.Nil(err)
+
+	// Now send a signal when transient decision is scheduled
+	err = s.sendSignal(s.domainName, workflowExecution, "signalA", nil, identity)
+	s.Nil(err, "failed to send signal to execution")
+
+	// Drop decision task to cause a Decision Timeout
+	_, err = poller.pollAndProcessDecisionTask(true, true)
+	s.logger.Infof("pollAndProcessDecisionTask: %v", err)
+	s.Nil(err)
+
+	// Print history after dropping decision
+	s.printWorkflowHistory(s.domainName, &workflow.WorkflowExecution{
+		WorkflowId: common.StringPtr(id),
+		RunId:      common.StringPtr(we.GetRunId()),
+	})
+
+	// Now process signal and complete workflow execution
+	_, err = poller.pollAndProcessDecisionTaskWithAttempt(true, false, false, false, int64(1))
+	s.logger.Infof("pollAndProcessDecisionTask: %v", err)
+	s.Nil(err)
+
+	s.Equal(1, signalCount)
+	s.True(workflowComplete)
+}
+
 func (s *integrationSuite) getHistory(domain string, execution *workflow.WorkflowExecution) []*workflow.HistoryEvent {
 	historyResponse, err := s.engine.GetWorkflowExecutionHistory(createContext(), &workflow.GetWorkflowExecutionHistoryRequest{
 		Domain:          common.StringPtr(domain),

service/history/historyEngine.go

@@ -754,7 +754,7 @@ Update_History_Loop:
 		}
 
 		// Start a timer for the decision task.
-		timeOutTask := tBuilder.AddStartToCloseDecisionTimoutTask(scheduleID, di.Attempt, di.DecisionTimeout)
+		timeOutTask := tBuilder.AddStartToCloseDecisionTimoutTask(di.ScheduleID, di.Attempt, di.DecisionTimeout)
 		timerTasks := []persistence.Task{timeOutTask}
 		defer e.timerProcessor.NotifyNewTimers(e.currentClusterName, e.shard.GetCurrentTime(e.currentClusterName), timerTasks)