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From "Thomas Graves (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4059) The history server should have a separate pluggable storage/query interface
Date Mon, 09 Apr 2012 19:07:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250075#comment-13250075
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Thomas Graves commented on MAPREDUCE-4059:
------------------------------------------

For the most part looks good. 

can you make the formatting in CachedHistoryStorage.java consistent - some places are missing
a space between if and (. 

I think it would be more extensible to have the getPartialJobs interface take a class rather
then all the individual query parameters. If you want to push this off to another Jira I'm
fine with that since its marked as InterfaceStability.Unstable.


                
> 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
>         Attachments: 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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