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https://issues.apache.org/jira/browse/HBASE-16165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15490880#comment-15490880
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stack commented on HBASE-16165:
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Go for it [~Apache9] Bug fix.
> Decrease RpcServer.callQueueSize before writeResponse causes OOM
> ----------------------------------------------------------------
>
> Key: HBASE-16165
> URL: https://issues.apache.org/jira/browse/HBASE-16165
> Project: HBase
> Issue Type: Bug
> Components: IPC/RPC, rpc
> Affects Versions: 2.0.0, 1.3.0, 1.4.0, 1.1.6, 1.2.3, 0.98.22
> Reporter: Duo Zhang
> Assignee: Guanghao Zhang
> Priority: Minor
> Labels: trivial
> Fix For: 2.0.0, 1.3.0, 1.4.0, 1.1.7, 0.98.23, 1.2.4
>
> Attachments: HBASE-16165.patch
>
>
> In RpcServer, we use {{callQueueSizeInBytes}} to avoid queuing too many calls
> which causes OOM. But in {{CallRunner.run}}, we decrease it before send the
> response back. And even after calling {{sendResponseIfReady}}, the call
> object could stay in our heap for a long time if we can not write out the
> response(That's why we need a Responder thread...). This makes it possible
> that the actual size of all call object in heap is larger than
> {{maxQueueSizeInBytes}} and causes OOM.
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