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From "Konstantin Shvachko (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-1910) when dfs.name.dir and dfs.name.edits.dir are same fsimage will be saved twice every time
Date Tue, 10 Jan 2012 02:05:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko resolved HDFS-1910.
---------------------------------------

          Resolution: Fixed
       Fix Version/s: 1.1.0
    Target Version/s: 1.1.0, 0.22.1  (was: 0.22.1, 1.1.0)

I just committed this to branch 1.
                
> when dfs.name.dir and dfs.name.edits.dir are same fsimage will be saved twice every time
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-1910
>                 URL: https://issues.apache.org/jira/browse/HDFS-1910
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.21.0
>            Reporter: Gokul
>            Priority: Minor
>              Labels: critical-0.22.0
>             Fix For: 1.1.0, 0.22.1
>
>         Attachments: saveImageOnce-v0.22.patch, saveImageOnce-v1.1.patch
>
>
> when image and edits dir are configured same, the fsimage flushing from memory to disk
will be done twice whenever saveNamespace is done. this may impact the performance of backupnode/snn
where it does a saveNamespace during every checkpointing time.

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