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https://issues.apache.org/jira/browse/MAPREDUCE-1175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nigel Daley updated MAPREDUCE-1175:
-----------------------------------

    Priority: Major  (was: Blocker)

I don't believe this is a blocker for any release. Moving to Major.

> We should have a spec on JobHistory file format
> -----------------------------------------------
>
>                 Key: MAPREDUCE-1175
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1175
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Hong Tang
>
> Currently, JobHistory schema is specified in o.a.h.m.jobhistory.Event.avpr, 
> it requires some guess work for me to understand the meaning of various 
> records. Also, it would be nice to spec out the dependency among the events. 
> This would make tools like rumen more dependable to parse job history logs.

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