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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6613) Change mapreduce.jobhistory.jhist.format default from json to binary
Date Tue, 26 Jan 2016 21:00:41 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15118005#comment-15118005
] 

Allen Wittenauer commented on MAPREDUCE-6613:
---------------------------------------------

Breaking it in 3.0 (with a release note, of course) is exactly the right thing to do.

> Change mapreduce.jobhistory.jhist.format default from json to binary
> --------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6613
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6613
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>    Affects Versions: 2.8.0
>            Reporter: Ray Chiang
>            Assignee: Ray Chiang
>            Priority: Minor
>         Attachments: MAPREDUCE-6613.001.patch
>
>
> MAPREDUCE-6376 added a configuration setting to set up .jhist internal format:
> mapreduce.jobhistory.jhist.format
> Currently, the default is "json".  Changing the default to "binary" allows faster parsing,
but with the downside of making the file not output friendly by using "hadoop fs cat".



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