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Support pausing jobs #104313

Manually merged
Sybren A. Stüvel merged 28 commits from David-Zhang-10/flamenco:paused-job-status into main 2024-07-01 17:53:44 +02:00
Conversation 1 Commits 28 Files Changed 12 +34 -23
2 changed files with 34 additions and 23 deletions
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41
internal/manager/task_state_machine/task_state_machine.go
View File

@ -189,13 +189,12 @@ func (sm *StateMachine) updateJobOnTaskStatusCanceled(ctx context.Context, logge
return 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("all tasks of job are completed, job is paused")
// 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")
}
}
// Execution should not reach here.
return nil
}
@ -221,15 +220,21 @@ 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 {
return sm.jobStatusIfAThenB(ctx, logger, job, api.JobStatusQueued, api.JobStatusActive,
"task failed, but not enough to fail the job")
} else {
David-Zhang-10 marked this conversation as resolved Outdated
Sybren A. Stüvel commented 2024-06-19 10:40:48 +02:00
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I don't think this is the right structure. The if {} block now contains a copy of the code below it, which is error-prone. There should be one piece of code responsible for one thing. By duplicating this code, there is the chance that one of the copies goes out of sync with the other, introducing hard to reason about bugs.

Also, don't use else after a return, it doesn't mean anything.

Better to just use:

if job.Status == api.JobStatusPauseRequested {
		numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
		if err != nil {
			return err
		}
		if numActive == 0 {
			// There is no active task, and the job is in pause-requested status, so we can pause the job.
			failLogger.Info().Msg("No more active tasks, job is paused")
			return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "all tasks completed")
		}
}

It'll also make it easier to move the code into a function of its own. It's the same "single responsibility principle" as before: there should be one piece of code that checks whether pausing a job is complete.

I don't think this is the right structure. The `if {}` block now contains a copy of the code below it, which is error-prone. There should be one piece of code responsible for one thing. By duplicating this code, there is the chance that one of the copies goes out of sync with the other, introducing hard to reason about bugs. Also, don't use `else` after a `return`, it doesn't mean anything. Better to just use: ```go if job.Status == api.JobStatusPauseRequested { numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive) if err != nil { return err } if numActive == 0 { // There is no active task, and the job is in pause-requested status, so we can pause the job. failLogger.Info().Msg("No more active tasks, job is paused") return sm.JobStatusChange(ctx, job, api.JobStatusPaused, "all tasks completed") } } ``` It'll also make it easier to move the code into a function of its own. It's the same "single responsibility principle" as before: there should be one piece of code that checks whether pausing a job is complete.
numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
if err != nil {
return err
}
if numActive == 0 && job.Status == api.JobStatusPauseRequested {
// there is no active task, and the job is in pause-requested status, so we can pause the job
logger.Info().Msg("all tasks of job are completed, job is paused")
if numActive == 0 {
// There is no active task, and the job is in pause-requested status, so we can pause the job.
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,
"task failed, but not enough to fail the job")
}
@ -240,19 +245,29 @@ func (sm *StateMachine) updateJobOnTaskStatusCompleted(ctx context.Context, logg
if err != nil {
return err
}
numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
if err != nil {
return err
}
if numComplete == numTotal {
logger.Info().Msg("all tasks of job are completed, job is completed")
return sm.JobStatusChange(ctx, job, api.JobStatusCompleted, "all tasks completed")
}
if numActive == 0 && job.Status == api.JobStatusPauseRequested {
// there is no active task, and the job is in pause-requested status, so we can pause the job
logger.Info().Msg("all tasks of job are completed, job is paused")
if job.Status != api.JobStatusPauseRequested {
logger.Info().
Int("taskNumTotal", numTotal).
Int("taskNumComplete", numComplete).
Msg("task completed; there are more tasks to do")
return sm.jobStatusIfAThenB(ctx, logger, job, api.JobStatusQueued, api.JobStatusActive, "no more tasks to do")
} else {
numActive, _, err := sm.persist.CountTasksOfJobInStatus(ctx, job, api.TaskStatusActive)
if err != nil {
return 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 sm.JobStatusChange(ctx, job, api.JobStatusPaused, "all tasks completed")
}
}
logger.Info().
Int("taskNumTotal", numTotal).
Int("taskNumComplete", numComplete).

4
internal/manager/task_state_machine/task_state_machine_test.go
View File

@ -76,7 +76,6 @@ func TestTaskStatusChangeActiveToCompleted(t *testing.T) {
mocks.expectWriteTaskLogTimestamped(t, task, "task changed status active -> completed")
mocks.expectBroadcastTaskChange(task, api.TaskStatusActive, api.TaskStatusCompleted)
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusCompleted).Return(1, 3, nil) // 1 of 3 complete.
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusActive).Return(2, 3, nil) // 2 of 3 active.
require.NoError(t, sm.TaskStatusChange(ctx, task, api.TaskStatusCompleted))
// Second task hickup: T: active > soft-failed --> J: active > active
@ -90,7 +89,6 @@ func TestTaskStatusChangeActiveToCompleted(t *testing.T) {
mocks.expectWriteTaskLogTimestamped(t, task2, "task changed status soft-failed -> completed")
mocks.expectBroadcastTaskChange(task2, api.TaskStatusSoftFailed, api.TaskStatusCompleted)
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusCompleted).Return(2, 3, nil) // 2 of 3 complete.
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusActive).Return(1, 3, nil) // 1 of 3 active.
require.NoError(t, sm.TaskStatusChange(ctx, task2, api.TaskStatusCompleted))
// Third task completing: T: active > completed --> J: active > completed
@ -98,7 +96,6 @@ func TestTaskStatusChangeActiveToCompleted(t *testing.T) {
mocks.expectWriteTaskLogTimestamped(t, task3, "task changed status active -> completed")
mocks.expectBroadcastTaskChange(task3, api.TaskStatusActive, api.TaskStatusCompleted)
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusCompleted).Return(3, 3, nil) // 3 of 3 complete.
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusActive).Return(0, 3, nil) // 0 of 3 active.
mocks.expectSaveJobWithStatus(t, task.Job, api.JobStatusCompleted)
mocks.expectBroadcastJobChange(task.Job, api.JobStatusActive, api.JobStatusCompleted)
@ -116,7 +113,6 @@ func TestTaskStatusChangeQueuedToFailed(t *testing.T) {
mocks.expectBroadcastTaskChange(task, api.TaskStatusQueued, api.TaskStatusFailed)
mocks.expectSaveJobWithStatus(t, task.Job, api.JobStatusActive)
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusFailed).Return(1, 100, nil) // 1 out of 100 failed.
mocks.persist.EXPECT().CountTasksOfJobInStatus(ctx, task.Job, api.TaskStatusActive).Return(0, 100, nil) // 0 out of 100 active.
mocks.expectBroadcastJobChange(task.Job, api.JobStatusQueued, api.JobStatusActive)
require.NoError(t, sm.TaskStatusChange(ctx, task, api.TaskStatusFailed))