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Date: Mon, 21 May 2012 18:13:41 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-2982) Startup performance suffers when there
 are many edit log segments
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     [ https://issues.apache.org/jira/browse/HDFS-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-2982:
---------------------------------------

    Attachment: HDFS-2982.006.patch
    
> 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
>            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
>
>
> 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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