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https://issues.apache.org/jira/browse/MAPREDUCE-4059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy closed MAPREDUCE-4059.
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> The history server should have a separate pluggable storage/query interface
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-4059
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4059
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2
> Affects Versions: 0.24.0, 0.23.3
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Fix For: 0.23.3, 2.0.2-alpha
>
> Attachments: MR-4059.txt, MR-4059.txt, MR-4059.txt, MR-4059.txt,
> MR-4059.txt, MR-4059.txt, MR-4059.txt
>
>
> The history server currently caches all parsed jobs in RAM. These jobs can
> be very large because of counters. It would be nice to have a pluggable
> interface for the cacheing and querying of the cached data so that we can
> play around with different implementations. Also just for cleanness of the
> code it would be nice to split the very large JobHistoryServer.java into a
> few smaller ones that are more understandable and readable.
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