ProcessExecutor failing

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#83 opened on Oct 1, 2016 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 30/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: python
Domain: backend

Research direction

Start with graphql/execution/executors/process.py and the call path in graphql/execution/executor.py, then reproduce the report on macOS with Python 3.5. Investigate the Queue argument handling and the pickling failure involving decorated resolvers and promises. Done means the reported Queue and _thread.lock errors no longer occur during resolver execution.

Written by the indexing model from the issue text.

Description

(using osx, python 3.5)

seems to be trouble with using promises and pickle together. Also decorated methods seem to have trouble which means resolvers are often a problem. Adding a comma to args fixes the "Queue is not iterable" error but the second error is much more intricate.

ERROR|2016-10-01 01:12:57,673|graphql.execution.executor >> An error occurred while resolving field Query.viewer
Traceback (most recent call last):
  File "/Users/ben/.virtualenvs/current/lib/python3.5/site-packages/graphql/execution/executor.py", line 190, in resolve_or_error
    return executor.execute(resolve_fn, source, args, context, info)
  File "/Users/ben/.virtualenvs/current/lib/python3.5/site-packages/graphql/execution/executors/process.py", line 29, in execute
    _process = Process(target=queue_process, args=(self.q))
  File "/usr/local/Cellar/python3/3.5.2_1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/multiprocessing/process.py", line 80, in __init__
    self._args = tuple(args)
TypeError: 'Queue' object is not iterable
[01/Oct/2016 01:12:57] "POST /graphql? HTTP/1.1" 200 116
Traceback (most recent call last):
  File "/usr/local/Cellar/python3/3.5.2_1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/multiprocessing/queues.py", line 241, in _feed
    obj = ForkingPickler.dumps(obj)
  File "/usr/local/Cellar/python3/3.5.2_1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/multiprocessing/reduction.py", line 51, in dumps
    cls(buf, protocol).dump(obj)
TypeError: can't pickle _thread.lock objects

Dominant language: Python
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