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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 Fri, 05 Nov 2010 06:19:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928506#action_12928506
] 

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

Todd, I briefly looked at the patch. It looks like you are trying to get rid of the Journal
Spool in BN. Correct me if I am wrong. I don't think you can. BN makes a checkpoint from its
memory state, which differs it from SNN and CN. While it does it, the namespace should be
locked (for modifications), so the edits go into journal spool, which is reapplied to memory
after the checkpoint is finished. Please see the design doc in HADOOP-4539.

> 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
>         Attachments: hdfs-1073.txt, hdfs1073.pdf
>
>
> 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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