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https://issues.apache.org/jira/browse/MAPREDUCE-6613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15117984#comment-15117984
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Allen Wittenauer commented on MAPREDUCE-6613:
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bq. I don't think we should worry about users catting the jhist file directly
Umm, that's probably the #1 way people are doing post processing.
> 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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