python - Luigi框架崩溃

Question

当我运行luigi任务时，有时会遇到框架崩溃，导致以下任务全部失败。这里是错误日志信息:

2017-10-05 22:02:02,564 luigi-interface WARNING  Failed pinging scheduler
2017-10-05 22:02:03,129 requests.packages.urllib3.connectionpool INFO     Starting new HTTP connection (126): localhost
2017-10-05 22:02:03,130 luigi-interface ERROR    Failed connecting to remote scheduler 'http://localhost:8082'
Traceback (most recent call last):
    ...
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/requests/sessions.py", line 585, in send
    r = adapter.send(request, **kwargs)
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/requests/adapters.py", line 467, in send
    raise ConnectionError(e, request=request)
    ConnectionError: HTTPConnectionPool(host='localhost', port=8082): Max retries exceeded with url: /api/add_worker (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f15128cb3d0>: Failed to establish a new connection: [Errno 111] Connection refused',))
2017-10-05 22:02:03,180 luigi-interface INFO     Worker Worker(salt=150908931, workers=3, host=etl2, username=develop, pid=18019) was stopped. Shutting down Keep-Alive thread
Traceback (most recent call last):
    File "app_metadata.py", line 1567, in <module>
    luigi.run()
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/interface.py", line 210, in run
    return _run(*args, **kwargs)['success']
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/interface.py", line 238, in _run
    return _schedule_and_run([cp.get_task_obj()], worker_scheduler_factory)
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/interface.py", line 197, in _schedule_and_run
    success &= worker.run()
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/worker.py", line 867, in run
    self._add_worker()
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/worker.py", line 652, in _add_worker
    self._scheduler.add_worker(self._id, self._worker_info)
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/rpc.py", line 219, in add_worker
    return self._request('/api/add_worker', {'worker': worker, 'info': info})
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/rpc.py", line 146, in _request
    page = self._fetch(url, body, log_exceptions, attempts)
    File "/home/develop/data_warehouse/venv/local/lib/python2.7/site-packages/luigi/rpc.py", line 138, in _fetch
    last_exception
    luigi.rpc.RPCError: Errors (3 attempts) when connecting to remote scheduler 'http://localhost:8082'

听起来像是尝试ping中央调度，但失败，然后崩溃，后面的任务都被阻止，无法成功运行。

而且，其他人也遇到了类似的错误，但他的解决方案不起作用。 Github - Failed connecting to remote scheduler #1894

Answer 1

如果您的中央调度程序过载，我会尝试将超时时间延长一点。您还可以增加重试和重试等待时间。

在 luigi.cfg 中

[core]
rpc-connect-timeout=60.0 #default is 10.0
rpc-retry-attempts=10    #default is 3
rpc-retry-wait=60        #default is 30

您可能还想添加一个监视程序，让调度程序进程在崩溃时自动重新启动。