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From "Lohit Vijayarenu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3948) Separate Namenodes edits and fsimage
Date Wed, 13 Aug 2008 17:12:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622281#action_12622281
] 

Lohit Vijayarenu commented on HADOOP-3948:
------------------------------------------

Running few experiments and observing logs of past run shows that there was IO contention
during checkpoint. It is clear that _edits_ and _fsimage_ should be separated and we should
have an option to configure them into its own directories. For example _dfs.name.dir_ could
have just the image and _dfs.edits.dir_ could have edits. Few key points

- This enables one to use combination of different directories/drives/mounts 
- Also enables administrator to choose how many copies of edits and fsimage once should maintain
- Splitting this might help for HA feature
- We should think about how we support upgrade and deal with cases when someone uses same
directory for both _edits_ and _fsimage_ or changes the configuration during restarts

> Separate Namenodes edits and fsimage 
> -------------------------------------
>
>                 Key: HADOOP-3948
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3948
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Lohit Vijayarenu
>
> NameNode's _edits_ and _fsimage_ should be separated with an option of having them in
their own separate directories.

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