python - celery 不运行和弦回调

Question

在看了很多关于和弦回调不执行的文章并尝试了他们的解决方案之后，我仍然无法让它工作。事实上，由于某种原因，chord_unlock 方法也没有被执行。

celery .py

from __future__ import absolute_import
from celery import Celery

app = Celery('sophie',
             broker='redis://localhost:6379/2',
             backend='redis://localhost:6379/2',
             include=['sophie.lib.chord_test'])

app.conf.update(
    CELERY_ACCEPT_CONTENT=["json"],
    CELERY_TASK_SERIALIZER="json",
    CELERY_TRACK_STARTED=True,
    CELERYD_PREFETCH_MULTIPLIER=1,   # NO PREFETCHING OF TASKS
    BROKER_TRANSPORT_OPTIONS = {
        'priority_steps': [0, 1]     # ALLOW ONLY 2 TASK PRIORITIES
    }
)

if __name__ == '__main__':
    app.start()

和弦测试.py

from __future__ import absolute_import
from sophie.celery import app
from celery import chord

@app.task(name='sophie.lib.add')
def add(x, y):
    return x + y

@app.task(name='sophie.lib.tsum')
def tsum(numbers):
    return sum(numbers)

if __name__ == '__main__':
    tasks = [add.s(100, 100), add.s(200, 200)]
    chord(tasks, tsum.s()).apply_async()

我的worker日志文件的输出如下

$ celery worker -l info --app=sophie.celery -n worker1.%h

 -------------- celery@worker1.vagrant-ubuntu-11 v3.1.6 (Cipater)
---- **** ----- 
--- * ***  * -- Linux-3.0.0-12-server-x86_64-with-Ubuntu-11.10-oneiric
-- * - **** --- 
- ** ---------- [config]
- ** ---------- .> broker:      redis://localhost:6379/2
- ** ---------- .> app:         sophie:0x3554250
- ** ---------- .> concurrency: 1 (prefork)
- *** --- * --- .> events:      OFF (enable -E to monitor this worker)
-- ******* ---- 
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery


[tasks]
  . sophie.lib.add
  . sophie.lib.tsum

[2013-12-12 19:37:26,499: INFO/MainProcess] Connected to redis://localhost:6379/2
[2013-12-12 19:37:26,506: INFO/MainProcess] mingle: searching for neighbors
[2013-12-12 19:37:27,512: INFO/MainProcess] mingle: all alone
[2013-12-12 19:37:27,527: WARNING/MainProcess] celery@worker1.vagrant-ubuntu-11 ready.
[2013-12-12 19:37:29,723: INFO/MainProcess] Received task: sophie.lib.add[b7d504c1-217f-43a9-b57e-86f0fcbdbe22]
[2013-12-12 19:37:29,734: INFO/MainProcess] Task sophie.lib.add[b7d504c1-217f-43a9-b57e-86f0fcbdbe22] succeeded in 0.009769904
00522s: 200
[2013-12-12 19:37:29,735: INFO/MainProcess] Received task: sophie.lib.add[eb01a73e-f6c8-401d-8049-6cdbc5f0bd90]
[2013-12-12 19:37:29,737: INFO/MainProcess] Task sophie.lib.add[eb01a73e-f6c8-401d-8049-6cdbc5f0bd90] succeeded in 0.001446505
00442s: 400

根本没有调用 chord_unlock。更多输出以提供更多上下文:

$ sudo pip freeze | egrep 'celery|kombu|billiard'
billiard==3.3.0.12
celery==3.1.6
kombu==3.0.7

$ uname -a
Linux vagrant-ubuntu-11 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

$ redis-server --version
Redis server version 2.2.11 (00000000:0)

Answer 1

chords documentation和弦使用以下语法:

 result = chord(header)(callback)

所以你可以这样做:

 chord(tasks)(tsum.s())