[jira] Commented: (HBASE-675) Report correct server hosting a table split for assignment to for MR Jobs

["Naama Kraus (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613533#action_12613533 ] 

Naama Kraus commented on HBASE-675:
-----------------------------------

Returning the region server is one option. Are there other options to consider ?
Would it make sense to return the nodes hosting the actual data files composing the table split (HStoreFiles blocks) ? As they are the ones accessed when reading the table split content ?

> 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
>            Reporter: Billy Pearson
>            Priority: Minor
>             Fix For: 0.3.0
>
>
> 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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