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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 Sun, 31 Aug 2008 04:45:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627275#action_12627275

stack commented on HBASE-675:

I thought that I'd see at least some improvement because TTs should have been running beside
regionserver if this thing was working properly and that should have made for some percentage

Let me try again.

> 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: 0.19.0
>         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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