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From "Bhallamudi Venkata Siva Kamesh (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4059) The history server should have a separate pluggable storage/query interface
Date Tue, 03 Apr 2012 17:54:24 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245541#comment-13245541
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Bhallamudi Venkata Siva Kamesh commented on MAPREDUCE-4059:
-----------------------------------------------------------

Hi Robert,
  if count is null, I think assigning count as jobs.size() seems a good option for me. If
so, I think we won't have any overflows and can eliminate the following piece of the code.
  {code:xml}
  if(end < 0) { //due to overflow
	end = Long.MAX_VALUE;
    }
  {code}
  Any comments?
                
> 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
>
>
> 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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