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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-334) Redesign the dfs namespace datastructures to be copy on write
Date Mon, 06 Nov 2006 23:34:41 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-334?page=comments#action_12447587 ] 
            
Raghu Angadi commented on HADOOP-334:
-------------------------------------


Why would we have to deal with multiple edit entries in this case? I thought the following
operation would be done under globalLock:

at the end of checkpointing we : close the new image file, remove (or move) old image file
and old edit logs.

This is just for my understanding.. I know Milind is working on different proposal.


> Redesign the dfs namespace datastructures to be copy on write
> -------------------------------------------------------------
>
>                 Key: HADOOP-334
>                 URL: http://issues.apache.org/jira/browse/HADOOP-334
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.4.0
>            Reporter: Owen O'Malley
>         Assigned To: Konstantin Shvachko
>
> The namespace datastructures should be copy on write so that the namespace does not need
to be completely locked down from user changes while the checkpoint is being made.

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