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From "Jakob Homan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1910) when dfs.name.dir and dfs.name.edits.dir are same fsimage will be saved twice every time
Date Fri, 06 Jan 2012 00:45:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181001#comment-13181001
] 

Jakob Homan commented on HDFS-1910:
-----------------------------------

It's up to Konstantin to commit to 1.1 if he wants; he has a committer's +1 to do so.  This
will be a serious pain to test in a true unit test, so rather than wait for someone to write
that code, I'd rather get the signficant startup time improvement in.  Yeah, it'd be great
to have a test - and if it were at all possible this could cause a data loss, I'd insist on
it - but people's time is limited.  I'd recommend filing a JIRA to add one; it would be a
good mid-level newbie issue.
                
> 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: 0.22.1
>
>         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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