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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4797) RPC Server can leave a lot of direct buffers
Date Tue, 09 Dec 2008 20:53:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654956#action_12654956
] 

stack commented on HADOOP-4797:
-------------------------------

Raghu: There is one on line #60 ('lager') but is so minor it does not merit regen of patches.
 Ran a little loading test w/ patch installed in a 0.19 pedigree hadoop and nothing obviously
broken.  +1 again.  

> 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
>             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.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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