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Posted to dev@qpid.apache.org by "Cliff Jansen (JIRA)" <ji...@apache.org> on 2017/07/13 05:47:00 UTC
[jira] [Updated] (PROTON-1394) Creating a Container leaks two file
descriptors
[ https://issues.apache.org/jira/browse/PROTON-1394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cliff Jansen updated PROTON-1394:
---------------------------------
Attachment: pn1394_0.patch
Here is an alternate patch that I hope will work fine with older versions of Python and can be backported to older versions of Proton.
By also breaking the circular reference in the handler hierarchy, it allows the reactor to free up more than just file descriptors and results in a complete release of Python and C resources according to my testing.
It should be noted that weak references to any Wrapper objects (i.e. Reactor and Container) is a dubious strategy since the Python Wrapper object's life may be very short. Hence the use of the reactor's C impl rather than a Python weakref in the ErrorDelegate.
None of the handlers are Wrapper objects, so a weakref proxy is used to break that circular reference.
> Creating a Container leaks two file descriptors
> -----------------------------------------------
>
> Key: PROTON-1394
> URL: https://issues.apache.org/jira/browse/PROTON-1394
> Project: Qpid Proton
> Issue Type: Bug
> Components: python-binding
> Affects Versions: 0.16.0
> Reporter: Mike Bonnet
> Attachments: fix_container_leak.patch, leakyprotonpipes.py, new_fix_container_leak.patch, pn1394_0.patch
>
>
> Creating a Container (Reactor) creates a pipe (two file descriptors). This pipe is never freed, even after the Container is stopped and goes out of scope. An application that creates many short-lived Containers will quickly exhaust file descriptors and Container creation will start failing.
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