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https://issues.apache.org/jira/browse/HBASE-21162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16606071#comment-16606071
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Andrew Purtell commented on HBASE-21162:
----------------------------------------
Findbugs warnings are expected with this change!
> Revert suspicious change to BoundedByteBufferPool and disable use of direct
> buffers for IPC reservoir by default
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-21162
> URL: https://issues.apache.org/jira/browse/HBASE-21162
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.4.7
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Priority: Critical
> Fix For: 1.5.0, 1.4.8
>
> Attachments: HBASE-21162-branch-1.patch
>
>
> We had a production incident where we traced the issue to a direct buffer
> leak. On a hunch we tried setting hbase.ipc.server.reservoir.enabled = false
> and after that no native memory leak could be observed in any regionserver
> process under the triggering load.
> On HBASE-19239 (Fix findbugs and error-prone issues) I made a change to
> BoundedByteBufferPool that is suspicious given this finding. It was committed
> to branch-1.4 and branch-1. I'm going to revert this change.
> In addition the allocation of direct memory for the server RPC reservoir is a
> bit problematic in that tracing native memory or direct buffer leaks to a
> particular class or compilation unit is difficult, so I also propose
> allocating the reservoir on the heap by default instead. Should there be a
> leak it is much easier to do an analysis of a heap dump with familiar tools
> to find it.
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