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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2982) Startup performance suffers when there are many edit log segments
Date Wed, 23 May 2012 20:29:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281881#comment-13281881
] 

Todd Lipcon commented on HDFS-2982:
-----------------------------------

+1, looks good to me. Thanks, Colin, I'll commit this momentarily.
                
> Startup performance suffers when there are many edit log segments
> -----------------------------------------------------------------
>
>                 Key: HDFS-2982
>                 URL: https://issues.apache.org/jira/browse/HDFS-2982
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Colin Patrick McCabe
>            Priority: Critical
>         Attachments: HDFS-2982.001.patch, HDFS-2982.002.patch, HDFS-2982.003.patch, HDFS-2982.004.patch,
HDFS-2982.005.patch, HDFS-2982.006.patch, HDFS-2982.007.patch, HDFS-2982.008.patch, HDFS-2982.009.patch
>
>
> For every one of the edit log segments, it seems like we are calling listFiles on the
edit log directory inside of {{findMaxTransaction}}. This is killing performance, especially
when there are many log segments and the directory is stored on NFS. It is taking several
minutes to start up the NN when there are several thousand log segments present.

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