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Type:
Bug
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Resolution: Duplicate
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Priority:
Major - P3
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None
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Affects Version/s: 3.0.3
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Component/s: None
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None
After upgrading pymongo from v2.7.2 to v3.0.3 we started getting errors in out django application:
Traceback (most recent call last): File "/opt/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/opt/venv/lib/python2.7/site-packages/django/views/decorators/http.py", line 41, in inner return func(request, *args, **kwargs) File "./tracker/views.py", line 238, in counters for document in pydb['event_url_source_all'].find({'site': int(site_id), 'url': url}): File "/opt/venv/lib/python2.7/site-packages/pymongo/cursor.py", line 977, in next if len(self.__data) or self._refresh(): File "/opt/venv/lib/python2.7/site-packages/pymongo/cursor.py", line 902, in _refresh self.__read_preference)) File "/opt/venv/lib/python2.7/site-packages/pymongo/cursor.py", line 813, in __send_message **kwargs) File "/opt/venv/lib/python2.7/site-packages/pymongo/mongo_client.py", line 728, in _send_message_with_response server = topology.select_server(selector) File "/opt/venv/lib/python2.7/site-packages/pymongo/topology.py", line 121, in select_server address)) File "/opt/venv/lib/python2.7/site-packages/pymongo/topology.py", line 97, in select_servers self._error_message(selector)) ServerSelectionTimeoutError: No replica set members found yet
strace revealed that we are getting this error only when mongodb doesn't return enough data.
working query:
sendto(15, "*2\r\n$3\r\nGET\r\n$54\r\n:1:6:counters:0897835589048e427cabb81b38fb66fff8409a95\r\n", 74, 0, NULL, 0) = 74 futex(0x28945a0, FUTEX_WAKE_PRIVATE, 1) = 0 recvfrom(15, "$23\r\n\200\2}q\1X\7\0\0\0twitterq\2K\0s.\r\n", 65536, 0, NULL, NULL) = 30 futex(0x28945a0, FUTEX_WAKE_PRIVATE, 1) = 0
query generating ServerSelectionTimeoutError exception:
sendto(16, "*2\r\n$3\r\nGET\r\n$54\r\n:1:6:counters:0897835589048e427cabb81b38fb66fff8409a95\r\n", 74, 0, NULL, 0) = 74 recvfrom(16, "$6\r\n\200\2}q\1.\r\n", 65536, 0, NULL, NULL) = 12 gettimeofday({1441043559, 210954}, NULL) = 0 gettimeofday({1441043559, 211032}, NULL) = 0 futex(0x27f7390, FUTEX_WAKE_PRIVATE, 1) = 1 gettimeofday({1441043559, 211087}, NULL) = 0 select(0, NULL, NULL, NULL, {0, 1000}) = 0 (Timeout)
Environment:
mongodb replicaset is configured with 3 nodes: 1 primary, 2 secondary
$ python -c "import sys; print(sys.version)" 2.7.5 (default, Jun 24 2015, 00:41:19) [GCC 4.8.3 20140911 (Red Hat 4.8.3-9)]
$ python -c "import pymongo; print(pymongo.version); print(pymongo.has_c())" 3.0.3 True
CentOS Linux release 7.0.1406 (Core) Django==1.7.7
uwsgi log:
*** Starting uWSGI 2.0.8 (64bit) on [Sun Aug 30 03:19:07 2015] *** compiled with version: 4.8.3 20140911 (Red Hat 4.8.3-9) on 28 August 2015 11:21:52 os: Linux-3.10.0-123.8.1.el7.x86_64 #1 SMP Mon Sep 22 19:06:58 UTC 2014 nodename: app-2118 machine: x86_64 clock source: unix detected number of CPU cores: 1 current working directory: / detected binary path: /opt/venv/bin/uwsgi !!! no internal routing support, rebuild with pcre support !!! chdir() to /opt/app your processes number limit is 7699 your memory page size is 4096 bytes *** WARNING: you have enabled harakiri without post buffering. Slow upload could be rejected on post-unbuffered webservers *** detected max file descriptor number: 1024 lock engine: pthread robust mutexes thunder lock: enabled uwsgi socket 0 inherited INET address 127.0.0.1:5001 fd 9 Python version: 2.7.5 (default, Jun 24 2015, 00:41:19) [GCC 4.8.3 20140911 (Red Hat 4.8.3-9)] Set PythonHome to /opt/venv *** Python threads support is disabled. You can enable it with --enable-threads *** Python main interpreter initialized at 0x1c17c20 your server socket listen backlog is limited to 100 connections your mercy for graceful operations on workers is 60 seconds mapped 509320 bytes (497 KB) for 6 cores *** Operational MODE: preforking *** WSGI app 0 (mountpoint='') ready in 0 seconds on interpreter 0x1c17c20 pid: 10057 (default app) *** uWSGI is running in multiple interpreter mode *** gracefully (RE)spawned uWSGI master process (pid: 10057) sendmsg(): Transport endpoint is already connected [core/notify.c line 39] spawned uWSGI worker 1 (pid: 15801, cores: 1) spawned uWSGI worker 2 (pid: 15802, cores: 1) spawned uWSGI worker 3 (pid: 15803, cores: 1) spawned uWSGI worker 4 (pid: 15804, cores: 1) spawned uWSGI worker 5 (pid: 15805, cores: 1) spawned uWSGI worker 6 (pid: 15806, cores: 1)
- duplicates
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- Closed
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