在查看了很多关于和弦回调未执行并尝试其解决方案的文章之后,我仍然无法使其正常工作.实际上,由于某些原因,chord_unlock方法也未执行.

芹菜

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()

chord_test.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()

我的工作程序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.一些更多的输出以提供进一步的上下文：

$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)

解决方法:

chords documentation对和弦使用以下语法：

 result = chord(header)(callback)

因此,您可以执行以下操作：

 chord(tasks)(tsum.s())