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我从 RethinkDB 数据库中检索的文档中包含时间戳（表示为datetime.datetime具有特殊tzinfo值 type的 Python 对象rethinkdb.ast.RqlTzinfo。

将其推送到 RQ 任务队列时，当任务尝试取消时间戳时，我在另一端收到 UnpickleError。

feeds = r.table('feeds') \
    .filter(lambda feed: feed['last_fetched'] \
        < (r.now() - config.FEED_REFRESH_INTERVAL)) \
    .pluck('id', 'feed_url', 'last_fetched').run(db)

q = Queue('feed_fetcher', connection=Redis())

for feed in feeds:
    print(feed['last_fetched']) # 2014-09-08 18:35:22.735000+00:00
    result = q.enqueue(fetch_feed, feed)

RQ worker 的输出：

18:48:34 *** Listening on feed_fetcher...
19:05:01 feed_fetcher: app.feedupdater.tasks.fetch_feed({u'last_fetched': datetime.datetime(2014, 9, 8, 18, 35, 22, 735000, tzinfo=<rethinkdb.ast.RqlTzinfo object at 0x7fdf508ed410>), u'id': u'ccd57063-a61a-4255-af67-94c244ff6bbb', u'feed_url': u'http://feeds.feedburner.com/hacker-news-feed-200?format=xml'}) (0002de8d-978c-4aeb-944e-2559458d114c)
Traceback (most recent call last):
  File "/usr/local/bin/rqworker", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/rq/scripts/rqworker.py", line 100, in main
    w.work(burst=args.burst)
  File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 358, in work
    self.execute_job(job)
  File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 422, in execute_job
    self.main_work_horse(job)
  File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 457, in main_work_horse
    success = self.perform_job(job)
  File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 473, in perform_job
    job.func_name,
  File "/usr/local/lib/python2.7/dist-packages/rq/job.py", line 225, in func_name
    self._unpickle_data()
  File "/usr/local/lib/python2.7/dist-packages/rq/job.py", line 193, in _unpickle_data
    self._func_name, self._instance, self._args, self._kwargs = unpickle(self.data)
  File "/usr/local/lib/python2.7/dist-packages/rq/job.py", line 50, in unpickle
    raise UnpickleError('Could not unpickle.', pickled_string, e)
rq.exceptions.UnpickleError: (u'Could not unpickle.', TypeError('__init__() takes exactly 2 arguments (1 given)', <class 'rethinkdb.ast.RqlTzinfo'>, ()))

我已经设法通过在进入队列之前用一个纪元时间替换时间戳来解决这个问题，但是这是一个权宜之计的解决方案，并且考虑到我必须处理时区等，这使得事情变得更加复杂。将纪元时间恢复到datetime对象中，然后再将其填充回数据库中。

问题出在哪里（是 RethinkDB 的RqlTzinfo对象还是 RQ 的 unpickling 实现），这是一个合法的错误还是只是我的糟糕实现？

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1 回答 1

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已提交修复并在 1.15.1 及更高版本中提供。这不再是一个问题。请参阅：https ://github.com/rethinkdb/rethinkdb/issues/3024 。

于 2014-11-13T22:44:56.413 回答