internal/manager/task_state_machine/task_state_machine.go

@@ -166,11 +166,26 @@ func (sm *StateMachine) jobStatusIfAThenB(
 	return sm.JobStatusChange(ctx, job, thenStatus, reason)
 }
 
+func (sm *StateMachine) shouldJobBePaused(ctx context.Context, logger zerolog.Logger, job *persistence.Job) (bool, error) {
+	if job.Status == api.JobStatusPauseRequested {
+		numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
+		if err != nil {
+			return false, err
+		}
+		if numActive == 0 {
+			// There is no active task, and the job is in pause-requested status, so we can pause the job.
+			logger.Info().Msg("No more active tasks, job is paused")
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
 // updateJobOnTaskStatusCanceled conditionally escalates the cancellation of a task to cancel the job.
 func (sm *StateMachine) updateJobOnTaskStatusCanceled(ctx context.Context, logger zerolog.Logger, job *persistence.Job) error {
 	// If no more tasks can run, cancel the job.
 	numRunnable, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job,
-		api.TaskStatusActive, api.TaskStatusQueued, api.TaskStatusSoftFailed, api.TaskStatusPaused)
+		api.TaskStatusActive, api.TaskStatusQueued, api.TaskStatusSoftFailed)
 	if err != nil {
 		return err
 	}
@@ -181,16 +196,12 @@ func (sm *StateMachine) updateJobOnTaskStatusCanceled(ctx context.Context, logge
 	}
 
 	// Deal with the special case when the job is in pause-requested status.
-	if job.Status == api.JobStatusPauseRequested {
+	toBePaused, err := sm.shouldJobBePaused(ctx, logger, job)
-		numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
+	if err != nil {
-		if err != nil {
+		return err
-			return err
+	}
-		}
+	if toBePaused {
-		if numActive == 0 {
+		return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "no more active tasks after task cancellation")
-			// There is no active task, and the job is in pause-requested status, so we can pause the job.
-			logger.Info().Msg("No more active tasks, job is paused")
-			return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "all tasks completed")
-		}
 	}
 
 	return nil
@@ -218,16 +229,13 @@ func (sm *StateMachine) updateJobOnTaskStatusFailed(ctx context.Context, logger
 	// If the job didn't fail, this failure indicates that at least the job is active.
 	failLogger.Info().Msg("task failed, but not enough to fail the job")
 
-	if job.Status == api.JobStatusPauseRequested {
+	// Deal with the special case when the job is in pause-requested status.
-		numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
+	toBePaused, err := sm.shouldJobBePaused(ctx, logger, job)
-		if err != nil {
+	if err != nil {
-			return err
+		return err
-		}
+	}
-		if numActive == 0 {
+	if toBePaused {
-			// There is no active task, and the job is in pause-requested status, so we can pause the job.
+		return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "no more active tasks after task failure")
-			failLogger.Info().Msg("No more active tasks, job is paused")
-			return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "all tasks completed")
-		}
 	}
 
 	return sm.jobStatusIfAThenB(ctx, logger, job, api.JobStatusQueued, api.JobStatusActive,
@@ -245,16 +253,13 @@ func (sm *StateMachine) updateJobOnTaskStatusCompleted(ctx context.Context, logg
 		return sm.JobStatusChange(ctx, job, api.JobStatusCompleted, "all tasks completed")
 	}
 
-	if job.Status == api.JobStatusPauseRequested {
+	// Deal with the special case when the job is in pause-requested status.
-		numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
+	toBePaused, err := sm.shouldJobBePaused(ctx, logger, job)
-		if err != nil {
+	if err != nil {
-			return err
+		return err
-		}
+	}
-		if numActive == 0 {
+	if toBePaused {
-			// There is no active task, and the job is in pause-requested status, so we can pause the job.
+		return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "no more active tasks after task completion")
-			logger.Info().Msg("No more active tasks, job is paused")
-			return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "all tasks completed")
-		}
 	}
 
 	logger.Info().
@@ -504,11 +509,11 @@ func (sm *StateMachine) pauseTasks(
 	}
 
 	// If pausing was requested, it has now happened, so the job can transition.
-	numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
+	toBePaused, err := sm.shouldJobBePaused(ctx, logger, job)
 	if err != nil {
 		return "", fmt.Errorf("error when accessing number of active tasks")
 	}
-	if job.Status == api.JobStatusPauseRequested && numActive == 0 {
+	if toBePaused {
 		logger.Info().Msg("all tasks of job paused, job can go to 'paused' status")
 		return api.JobStatusPaused, nil
 	}

internal/manager/task_state_machine/task_state_machine_test.go

@@ -185,7 +185,7 @@ func TestTaskStatusChangeCancelSingleTask(t *testing.T) {
 	mocks.expectWriteTaskLogTimestamped(t, task, "task changed status active -> canceled")
 	mocks.expectBroadcastTaskChange(task, api.TaskStatusActive, api.TaskStatusCanceled)
 	mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, job,
-		api.TaskStatusActive, api.TaskStatusQueued, api.TaskStatusSoftFailed, api.TaskStatusPaused).
+		api.TaskStatusActive, api.TaskStatusQueued, api.TaskStatusSoftFailed).
 		Return(1, 2, nil)
 	require.NoError(t, sm.TaskStatusChange(ctx, task, api.TaskStatusCanceled))
 
@@ -194,7 +194,7 @@ func TestTaskStatusChangeCancelSingleTask(t *testing.T) {
 	mocks.expectWriteTaskLogTimestamped(t, task2, "task changed status queued -> canceled")
 	mocks.expectBroadcastTaskChange(task2, api.TaskStatusQueued, api.TaskStatusCanceled)
 	mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, job,
-		api.TaskStatusActive, api.TaskStatusQueued, api.TaskStatusSoftFailed, api.TaskStatusPaused).
+		api.TaskStatusActive, api.TaskStatusQueued, api.TaskStatusSoftFailed).
 		Return(0, 2, nil)
 	mocks.expectSaveJobWithStatus(t, job, api.JobStatusCanceled)
 	mocks.expectBroadcastJobChange(task.Job, api.JobStatusCancelRequested, api.JobStatusCanceled)
@@ -340,7 +340,7 @@ func TestJobPauseWithAllQueuedTasks(t *testing.T) {
 	mockCtrl, ctx, sm, mocks := taskStateMachineTestFixtures(t)
 	defer mockCtrl.Finish()
 
-	task1 := taskWithStatus(api.JobStatusActive, api.TaskStatusQueued)
+	task1 := taskWithStatus(api.JobStatusQueued, api.TaskStatusQueued)
 	task2 := taskOfSameJob(task1, api.TaskStatusQueued)
 	task3 := taskOfSameJob(task2, api.TaskStatusQueued)
 	job := task3.Job
@@ -348,17 +348,82 @@ func TestJobPauseWithAllQueuedTasks(t *testing.T) {
 	mocks.expectSaveJobWithStatus(t, job, api.JobStatusPauseRequested)
 
 	// Expect pausing of the job to trigger pausing of all its queued tasks.
-	mocks.persist.EXPECT().UpdateJobsTaskStatuses(ctx, job, api.TaskStatusPaused,
+	mocks.persist.EXPECT().UpdateJobsTaskStatusesConditional(ctx, job,
-		"Paused because job transitioned status from \"active\" to \"paused\"")
+		[]api.TaskStatus{
-
+			api.TaskStatusQueued,
+			api.TaskStatusSoftFailed,
+		},
+		api.TaskStatusPaused,
+		"Manager paused this task because the job got status \"pause-requested\".",
+	)
+	mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, job,
+		api.TaskStatusActive).
+		Return(0, 3, nil)
 	mocks.expectSaveJobWithStatus(t, job, api.JobStatusPaused)
-
+	mocks.expectBroadcastJobChangeWithTaskRefresh(job, api.JobStatusQueued, api.JobStatusPauseRequested)
-	mocks.expectBroadcastJobChangeWithTaskRefresh(job, api.JobStatusActive, api.JobStatusPauseRequested)
 	mocks.expectBroadcastJobChange(job, api.JobStatusPauseRequested, api.JobStatusPaused)
 
 	require.NoError(t, sm.JobStatusChange(ctx, job, api.JobStatusPauseRequested, "someone wrote a unittest"))
 }
 
+func TestJobPauseWithSomeCompletedTasks(t *testing.T) {
+	mockCtrl, ctx, sm, mocks := taskStateMachineTestFixtures(t)
+	defer mockCtrl.Finish()
+
+	task1 := taskWithStatus(api.JobStatusQueued, api.TaskStatusCompleted)
+	task2 := taskOfSameJob(task1, api.TaskStatusQueued)
+	task3 := taskOfSameJob(task2, api.TaskStatusQueued)
+	job := task3.Job
+
+	mocks.expectSaveJobWithStatus(t, job, api.JobStatusPauseRequested)
+
+	// Expect pausing of the job to trigger pausing of all its queued tasks.
+	mocks.persist.EXPECT().UpdateJobsTaskStatusesConditional(ctx, job,
+		[]api.TaskStatus{
+			api.TaskStatusQueued,
+			api.TaskStatusSoftFailed,
+		},
+		api.TaskStatusPaused,
+		"Manager paused this task because the job got status \"pause-requested\".",
+	)
+	mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, job,
+		api.TaskStatusActive).
+		Return(0, 3, nil)
+	mocks.expectSaveJobWithStatus(t, job, api.JobStatusPaused)
+	mocks.expectBroadcastJobChangeWithTaskRefresh(job, api.JobStatusQueued, api.JobStatusPauseRequested)
+	mocks.expectBroadcastJobChange(job, api.JobStatusPauseRequested, api.JobStatusPaused)
+
+	require.NoError(t, sm.JobStatusChange(ctx, job, api.JobStatusPauseRequested, "someone wrote a unittest"))
+}
+
+func TestJobPauseWithSomeActiveTasks(t *testing.T) {
+	mockCtrl, ctx, sm, mocks := taskStateMachineTestFixtures(t)
+	defer mockCtrl.Finish()
+
+	task1 := taskWithStatus(api.JobStatusActive, api.TaskStatusActive)
+	task2 := taskOfSameJob(task1, api.TaskStatusCompleted)
+	task3 := taskOfSameJob(task2, api.TaskStatusQueued)
+	job := task3.Job
+
+	mocks.expectSaveJobWithStatus(t, job, api.JobStatusPauseRequested)
+
+	// Expect pausing of the job to trigger pausing of all its queued tasks.
+	mocks.persist.EXPECT().UpdateJobsTaskStatusesConditional(ctx, job,
+		[]api.TaskStatus{
+			api.TaskStatusQueued,
+			api.TaskStatusSoftFailed,
+		},
+		api.TaskStatusPaused,
+		"Manager paused this task because the job got status \"pause-requested\".",
+	)
+	mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, job,
+		api.TaskStatusActive).
+		Return(1, 3, nil)
+	mocks.expectBroadcastJobChangeWithTaskRefresh(job, api.JobStatusActive, api.JobStatusPauseRequested)
+
+	require.NoError(t, sm.JobStatusChange(ctx, job, api.JobStatusPauseRequested, "someone wrote a unittest"))
+}
+
 func TestCheckStuck(t *testing.T) {
 	mockCtrl, ctx, sm, mocks := taskStateMachineTestFixtures(t)
 	defer mockCtrl.Finish()