Memory leak in DirectExchange bind/unbind
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Key: QPID-3752
URL: https://issues.apache.org/jira/browse/QPID-3752
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Affects Versions: 0.12, 0.8
Environment: RHEL4.7 and RHEL6.2
Reporter: Rob Springer
One of our customers observed that the Qpid daemon's memory footprint increased
over a number of weeks. We were able to reproduce this in-house, and noticed
that the increase was correlated with queu creation/deletion (our application,
when under load, creates & destroys a large number of queues).
This memory leak wasn't discoverable with valgrind (i.e., memcheck), since it's
not the result of lost pointers, but massif was very useful. It appears that
entries in the std::map Bindings (DirectExchange.h:41) created on
DirectExchange.cpp:71 (during creation of, in our case, the default binding)
are never deleted when the queue and binding are deleted on
DirectExchange.cpp:~138.
While individual map entries aren't that expensive, over several thousand queue
creations and deletions, the memory consumed does grow to be substantial.
If I explicitly delete the map entry, memory usage appears to remain stable
over time.
While I doubt that my fix will be best way to resolve this issue, I'll attach
my patch anyway, in the case that it helps in understanding the issue.
Thanks!
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