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如果我编写一个调用其他 celery 任务的 celery 任务,我可以释放父任务/worker 而不等待下游任务完成吗?

情况: 我正在使用一个 API,它返回一些数据和下一个 API 调用的参数。我想将 API 背后的所有数据放入数据库中。我目前的方法是查询要处理的批处理的API,启动一些下游处理器,然后递归地重新调用API+处理链。我担心当工人不关心他们孩子的结果时,这会锁定工人等待所有递归 API 调用完成。

伪代码:

@task
def apiPing(start=None):
    """ Returns a dict of 5 elements, starting at the *start* element, or the 
    beginning of the list if start is not specified.  Also present in the dict is 'remaining',
    indicating how many elements are left in the API's list"""
    return json.loads(api(start))

@task
def processList(data)
    """ Takes a result from API ping, starts a task to store each element and a 
    chain to recall the API and process that."""
    for element in data:
        store(element).delay()

    if data['remaining']!=0:
        chain = chain(apiPing.s(data['last']), processList.s())
        chain.delay()

我从这里了解到,上述情况非常接近于糟糕;在处理 API 中的所有数据之前,我不希望处理 processList() 的工作人员被锁定。有没有办法启动下游任务并释放父工人,或者重构上述不锁定工人?

测试表明,工人实际上是这样锁定的:

from celery import task
from time import sleep

@task
def parent():
    print "In parent"
    child.apply_async()
    print "Out of parent"

@task
def child():
    print "In child"
    sleep(10)
    print "Out of child"

[2013-08-05 18:37:29,264: WARNING/PoolWorker-4] In parent
[2013-08-05 18:37:31,278: WARNING/PoolWorker-2] In child
[2013-08-05 18:37:41,285: WARNING/PoolWorker-2] Out of child
[2013-08-05 18:37:41,298: WARNING/PoolWorker-4] Out of parent
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