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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4797) RPC Server can leave a lot of direct buffers
Date Fri, 19 Dec 2008 08:01:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12658034#action_12658034
] 

Zheng Shao commented on HADOOP-4797:
------------------------------------

Raghu how is this affecting 0.17.2?

> 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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