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From "Jonathan Eagles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6141) History server leveldb recovery store
Date Thu, 30 Oct 2014 15:49:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190259#comment-14190259
] 

Jonathan Eagles commented on MAPREDUCE-6141:
--------------------------------------------

Thanks, [~jlowe]. Everything looks good now. I'll wait a day or so to let others in the community.

> History server leveldb recovery store
> -------------------------------------
>
>                 Key: MAPREDUCE-6141
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6141
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: MAPREDUCE-6141.patch, MAPREDUCE-6141v2.patch
>
>
> It would be nice to have a leveldb option to the job history server recovery store. 
Leveldb would provide some benefits over the existing filesystem store such as better support
for atomic operations, fewer I/O ops per state update, and far fewer total files on the filesystem.



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