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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1073) Simpler model for Namenode's fs Image and edit Logs
Date Tue, 13 Apr 2010 19:14:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856562#action_12856562
] 

Todd Lipcon commented on HDFS-1073:
-----------------------------------

Hi Konstantin,

Thanks for the question. I'm maintaining the existing fsimage_ckpt_N naming for the upload
in progress. So at startup, that file is removed during recovery. The old image fsimage_M
where M < N would still exist, so that would be used for recovery.

The same's true for checkpoint uploads - if it fails in the middle it wouldn't be renamed
yet, so we'd recover from an older fsimage.

> Simpler model for Namenode's fs Image and edit Logs 
> ----------------------------------------------------
>
>                 Key: HDFS-1073
>                 URL: https://issues.apache.org/jira/browse/HDFS-1073
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>            Assignee: Todd Lipcon
>
> The naming and handling of  NN's fsImage and edit logs can be significantly improved
resulting simpler and more robust code.

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