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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11562) CopyTable should provide an option to shuffle the mapper tasks
Date Wed, 23 Jul 2014 04:46:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071359#comment-14071359
] 

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/12657267/HBASE-11562-v2-trunk.patch
  against trunk revision .
  ATTACHMENT ID: 12657267

    {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:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 1 warning messages.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.mapreduce.TestCellCounter
                  org.apache.hadoop.hbase.mapreduce.TestRowCounter
                  org.apache.hadoop.hbase.mapreduce.TestTableInputFormatScan1
                  org.apache.hadoop.hbase.mapreduce.TestTimeRangeMapRed
                  org.apache.hadoop.hbase.replication.TestReplicationSmallTests
                  org.apache.hadoop.hbase.mapreduce.TestCopyTable
                  org.apache.hadoop.hbase.mapreduce.TestImportExport
                  org.apache.hadoop.hbase.mapreduce.TestTableMapReduce
                  org.apache.hadoop.hbase.mapreduce.TestMultithreadedTableMapper
                  org.apache.hadoop.hbase.mapreduce.TestTableInputFormatScan2

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/10152//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, HBASE-11562-v2-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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