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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-675) Report correct server hosting a table split for assignment to for MR Jobs
Date Wed, 13 Aug 2008 00:51:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622053#action_12622053
] 

stack commented on HBASE-675:
-----------------------------

I tried this with a couple of hundred regions.  Ran the rowcounter MR job.  No discernible
difference.  Might be because I only have 4 nodes each with datanode and regionservers. Perhaps
its not enough?  Let me take a look to see that we're giving back info thats wanted.

> Report correct server hosting a table split for assignment to for MR Jobs
> -------------------------------------------------------------------------
>
>                 Key: HBASE-675
>                 URL: https://issues.apache.org/jira/browse/HBASE-675
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Billy Pearson
>            Priority: Minor
>             Fix For: 0.3.0
>
>         Attachments: hbase-675-v1.patch
>
>
> Currently we return a null String array to the MR framework to use a random node for
MR job assignment.
> class: org.apache.hadoop.hbase.mapred.tableSplit
> function getLocations()
> We should be able to query the meta now for the current host name of the server hosting
the region in question.
> This will help with scaling as there will be less cross server communication removing
bandwidth as a bottleneck.
> The side effect of fixing this will help from overloading region servers with lots of
MR clients all pulling from the same region server while theres work local for them to do.

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