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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1112) Edit log buffer should not grow unboundedly
Date Fri, 21 May 2010 18:54:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870108#action_12870108
] 

Hudson commented on HDFS-1112:
------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #278 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk-Commit/278/])
    HDFS-1112. Edit log buffer should not grow unboundedly. Contributed by Hairong Kuang.


> Edit log buffer should not grow unboundedly
> -------------------------------------------
>
>                 Key: HDFS-1112
>                 URL: https://issues.apache.org/jira/browse/HDFS-1112
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.22.0
>
>         Attachments: editLogBuf.patch, editLogBuf1.patch, editLogBuf2.patch, editLogBuf3.patch
>
>
> Currently HDFS does not impose an upper limit on the edit log buffer. In case there are
a large number of open operations coming in with access time update on, since open does not
call sync automatically, there is a possibility that the buffer grow to a large size, therefore
causes memory leak and full GC in extreme cases as described in HDFS-1104. 
> The edit log buffer should be automatically flushed when the buffer becomes full.

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