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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-227) Namespace check pointing is not performed until the namenode restarts.
Date Wed, 17 May 2006 23:40:05 GMT
Namespace check pointing is not performed until the namenode restarts.
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         Key: HADOOP-227
         URL: http://issues.apache.org/jira/browse/HADOOP-227
     Project: Hadoop
        Type: Bug

  Components: dfs  
    Reporter: Konstantin Shvachko


In current implementation when the name node starts, it reads its image file, then
the edits file, and then saves the updated image back into the image file.
The image file is never updated after that.
In order to provide the system reliability reliability the namespace information should
be check pointed periodically, and the edits file should be kept relatively small.


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