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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4797) RPC Server can leave a lot of direct buffers
Date Sat, 13 Dec 2008 17:33:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656311#action_12656311
] 

Hadoop QA commented on HADOOP-4797:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12395979/HADOOP-4797.patch
  against trunk revision 726129.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3737/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3737/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3737/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3737/console

This message is automatically generated.

> 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.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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