[jira] [Commented] (HBASE-11562) CopyTable should provide an option to shuffle the mapper tasks

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-11562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069784#comment-14069784 ] 

Hadoop QA commented on HBASE-11562:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12657044/HBASE-11562-v0-trunk.patch
  against trunk revision .
  ATTACHMENT ID: 12657044

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/10142//console

This message is automatically generated.

> CopyTable should provide an option to shuffle the mapper tasks
> --------------------------------------------------------------
>
>                 Key: HBASE-11562
>                 URL: https://issues.apache.org/jira/browse/HBASE-11562
>             Project: HBase
>          Issue Type: Bug
>          Components: mapreduce
>    Affects Versions: 0.99.0, 0.94.20, 0.98.4
>            Reporter: Jean-Marc Spaggiari
>            Assignee: Jean-Marc Spaggiari
>         Attachments: HBASE-11562-v0-trunk.patch
>
>
> When doing a copy table from a table with a lot of regions to a table to way less regions, on a cluster with limited number of mappers, since map tasks are ordered by key, tasks will first run for the few first regions and will hotspot a single region server on the destination side.
> To avoid this, we should submit the map tasks in a random order.
> This JIRA is to add this option to CopyTable and TableInputFormat



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