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From "Konstantin Shvachko (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1910) when dfs.name.dir and dfs.name.edits.dir are same fsimage will be saved twice every time
Date Mon, 19 Dec 2011 22:55:32 GMT

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

Konstantin Shvachko updated HDFS-1910:
--------------------------------------

    Attachment: saveImageOnce-v0.22.patch

Here is a simple fix for branch 0.22.
                
> 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
>         Attachments: saveImageOnce-v0.22.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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