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Problem:
during a rolling bounce of the members of a replset, the following was seen in the mongos logs
Sun Oct 10 22:05:40 [WriteBackListener] MessagingPort say send() errno:32 Broken pipe 10.121.14.5:27018
Sun Oct 10 22:05:40 [WriteBackListener] WriteBackListener exception : St9exception
Sun Oct 10 22:05:46 [WriteBackListener] MessagingPort say send() errno:32 Broken pipe 10.121.14.5:27018
Sun Oct 10 22:05:46 [WriteBackListener] WriteBackListener exception : St9exception
At this point the application could not read or write to the DB
Workaround:
- bounce the mongos
- bounce the apache server (running the PHP driver)
The bounce of the mongos did not solve the problem, the apache server had to be bounced as well. Possibly a connection pooling / persistent connection issue?
Business case:
- User experience
During a failover, the monogs/drivers should deal with this gracefully.
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