python - celery 任务在 redis 后端连接套接字超时时引发错误

Question

我正在使用 celery 通过 redis 代理一个一个地运行任务，但是当我运行 2 个任务然后在完成第一个 redis 后给出第二个任务的超时套接字错误，这样第二个任务就会失败。

File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/celery/result.py", line 194, in get
on_message=on_message,
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/celery/backends/async.py", line 189, in wait_for_pending
for _ in self._wait_for_pending(result, **kwargs):
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/celery/backends/async.py", line 256, in _wait_for_pending
on_interval=on_interval):
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/celery/backends/async.py", line 57, in drain_events_until
yield self.wait_for(p, wait, timeout=1)
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/celery/backends/async.py", line 66, in wait_for
wait(timeout=timeout)
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/celery/backends/redis.py", line 69, in drain_events
m = self._pubsub.get_message(timeout=timeout)
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/redis/client.py", line 2513, in get_message
response = self.parse_response(block=False, timeout=timeout)
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/redis/client.py", line 2430, in parse_response
return self._execute(connection, connection.read_response)
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/redis/client.py", line 2408, in _execute
return command(*args)
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/redis/connection.py", line 624, in read_response
response = self._parser.read_response()
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/redis/connection.py", line 284, in read_response
response = self._buffer.readline()
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/redis/connection.py", line 216, in readline
self._read_from_socket()
File "/home/ubuntu/.virtualenvs/aide_venv/local/lib/python2.7/site-packages/redis/connection.py", line 187, in _read_from_socket
raise TimeoutError("Timeout reading from socket")
TimeoutError: Timeout reading from socket

我正在使用以下命令运行 celery :

celery -A flask_application.celery worker --loglevel=info --max-tasks-per-child=1 --concurrency=1

我通过使用调用 celery 任务:.delay() 函数

celery_response = run_algo.run_pipeline.delay(request.get_json())

使用.get()函数获取输出

output_file_path = celery_response.get()

Answer 1

AsyncResult.get 的文档中有一个警告说在异步任务中调用它会导致死锁，这可能就是这里发生的事情，尽管如果没有更多上下文就很难判断这些东西在哪里被调用。