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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2982) Startup performance suffers when there are many edit log segments
Date Wed, 22 Feb 2012 00:44:48 GMT
Startup performance suffers when there are many edit log segments
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                 Key: HDFS-2982
                 URL: https://issues.apache.org/jira/browse/HDFS-2982
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.24.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Critical


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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