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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1073) Simpler model for Namenode's fs Image and edit Logs
Date Tue, 06 Apr 2010 01:08:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853631#action_12853631
] 

Robert Chansler commented on HDFS-1073:
---------------------------------------

The name of a file is not the issue, but rather knowing what is in the file. Sanjay (in an
early comment) stated the correctness rule in terms of TxIDs. Is there a proposal to substitute
some other correctness rules? Another rule set seems to be more complex than what Sanjay proposes
if it presupposes file name rules and coordination about when particular files are created,
written and closed.

Describing correctness in terms of TxIDs is attractive in that it is then possible to state
retention rules for edits and image files conveniently. And it seems to facilitate the charming
idea of having a utility service create checkpoints for any number of name servers without
coordination/cooperation.

> 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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