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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1073) Simpler model for Namenode's fs Image and edit Logs
Date Tue, 13 Apr 2010 19:08:56 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856556#action_12856556
] 

Konstantin Shvachko commented on HDFS-1073:
-------------------------------------------

A question:
I have one NN storage directory, which is image and edits. I have image file fsimage_N in
it and edits_N_inprogress. And I also observed on the previous start up that NN failed in
the middle of writing file fsimage_N. How do I recover from it?
Another similar scenario is when a checkpointer starts to upload the new image to NN but fails
in the middle. How do you recognize that the latest image file is incomplete and the previous
version should be used instead?

> 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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