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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1073) Simpler model for Namenode's fs Image and edit Logs
Date Fri, 05 Nov 2010 16:59:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928682#action_12928682
] 

Sanjay Radia commented on HDFS-1073:
------------------------------------

>.. not understand the rational for "I'm quitting!" record. Why should NN care whether
last record was lost or not, just keep going with what it has.
The quitting record basically shows that the NN did a shutdown and did not die. This is useful
to know. The NN will still continue to keep going as before.

If we were to add a similar "rolled" transaction at the end of every roll then we could avoid
the edits_100-100 since it will become edits_100-101.
Also the "rolled" transaction is a nice way to to tell the BN that the primary did a roll
without any special message from NN to BNN.



> 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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