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https://issues.apache.org/jira/browse/HADOOP-4797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657127#action_12657127
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Konstantin Shvachko commented on HADOOP-4797:
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+1
> RPC Server can leave a lot of direct buffers
> ---------------------------------------------
>
> Key: HADOOP-4797
> URL: https://issues.apache.org/jira/browse/HADOOP-4797
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.17.0
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
> Priority: Blocker
> Fix For: 0.18.3, 0.19.1, 0.20.0
>
> Attachments: HADOOP-4797-branch-18.patch,
> HADOOP-4797-branch-18.patch, HADOOP-4797-branch-18.patch,
> HADOOP-4797-branch-18.patch, HADOOP-4797.patch, HADOOP-4797.patch,
> HADOOP-4797.patch, TestRpcCpu.patch, TestRpcCpu.patch
>
>
> RPC server unwittingly can soft-leak direct buffers. One observed case is
> that one of the namenodes at Yahoo took 40GB of virtual memory though it was
> configured for 24GB memory. Most of the memory outside Java heap expected to
> be direct buffers. This shown to be because of how RPC server reads and
> writes serialized data. The cause and proposed fix are in following comment.
>
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