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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 22:02:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856648#action_12856648

Konstantin Shvachko commented on HDFS-1073:

I did not find it in the design above, so I asked. 
Now the next step is to write out a step-by-step procedure say for {{saveNamespace()}} and
outline how you recover from failures on different stages. I mean that with the new approach
you still need to rename fsimage_ckpt_N+1 to fsimage_N+1 and at the same time create new edits_N+1_inprogress.
And this is not atomic. We can start from a single directory, and then make sure it works
in multi- and split- directory cases.
I am trying to understand how much simpler it gets.

> 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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