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https://issues.apache.org/jira/browse/HBASE-16165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15358726#comment-15358726
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Duo Zhang commented on HBASE-16165:
-----------------------------------
One possible way to fix this is to decrease call queue size after we write out
the whole response. And in fact, the param field of a call object is useless
when we want to write response, so maybe we could set it null to reduce memory
pressure?
Suggestions are welcomed. Thanks.
> Decrease RpcServer.callQueueSize before writeResponse causes OOM
> ----------------------------------------------------------------
>
> Key: HBASE-16165
> URL: https://issues.apache.org/jira/browse/HBASE-16165
> Project: HBase
> Issue Type: Bug
> Reporter: Duo Zhang
>
> 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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