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Posted to common-issues@hadoop.apache.org by "chen (JIRA)" <ji...@apache.org> on 2013/06/23 15:55:20 UTC

[jira] [Updated] (HADOOP-227) Namespace check pointing is not performed until the namenode restarts.

     [ https://issues.apache.org/jira/browse/HADOOP-227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

chen updated HADOOP-227:
------------------------

    Description: 
ddfgdfgIn 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.


  was:
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.


    
> Namespace check pointing is not performed until the namenode restarts.
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-227
>                 URL: https://issues.apache.org/jira/browse/HADOOP-227
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.2.0
>            Reporter: Konstantin Shvachko
>            Assignee: dhruba borthakur
>             Fix For: 0.11.0
>
>         Attachments: patch-async-checkpoints-0.9.0, patch-async-checkpoints-0.9.0, patch-async-checkpoints-0.9.0, periodiccheckpoint7.patch
>
>
> ddfgdfgIn 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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