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https://issues.apache.org/jira/browse/AMQ-3316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13874102#comment-13874102
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Georgi Danov commented on AMQ-3316:
-----------------------------------
created AMQ-4977
> Memory leak in ConnectionStateTracker with MessagePull objects
> --------------------------------------------------------------
>
> Key: AMQ-3316
> URL: https://issues.apache.org/jira/browse/AMQ-3316
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.4.2, 5.5.0
> Reporter: Martin Carpella
> Assignee: Gary Tully
> Fix For: 5.6.0
>
> Attachments: connectionstatetracker_fixed.patch
>
>
> We discovered a memory leak in {{ConnectionStateTracker}} in case a
> long-lived connection with prefetch=0 is used.
> If prefetch=0 is used, {{MessagePull}} objects are enqueued in
> {{messageCache}} with an estimated size of 400. But in the cache's
> {{removeEldestEntry()}} method no size is subtracted from
> {{currentCacheSize}} for {{MessagePull}} instances. This messes with the
> cache as it will continue to remove objects even if there is space in the
> cache. But after about 5,368,709 consumed messages this will cause the
> {{currentCacheSize}} to roll-over maximum integer and become negative. As a
> consequence, for the next about 5,368,709 no messages will be removed from
> the cache any longer.
> This sooner or later will trigger out-of-memory conditions, depending on the
> size of the various pools. In our case this caused out-of-memory in PermGen
> first, as message IDs seem to be internalized, and PermGen is considerably
> smaller than the heap.
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