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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3996) Support multiple tables and scanners as input to the mapper in map/reduce jobs
Date Tue, 20 Mar 2012 06:09:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233241#comment-13233241
] 

Hadoop QA commented on HBASE-3996:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12519023/3996-v4.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 166 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

     -1 core tests.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.mapreduce.TestMultiTableInputFormat
                  org.apache.hadoop.hbase.mapreduce.TestImportTsv
                  org.apache.hadoop.hbase.mapred.TestTableMapReduce
                  org.apache.hadoop.hbase.mapreduce.TestHFileOutputFormat

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/1230//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/1230//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/1230//console

This message is automatically generated.
                
> Support multiple tables and scanners as input to the mapper in map/reduce jobs
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-3996
>                 URL: https://issues.apache.org/jira/browse/HBASE-3996
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>            Reporter: Eran Kutner
>            Assignee: Eran Kutner
>             Fix For: 0.94.0, 0.96.0
>
>         Attachments: 3996-v2.txt, 3996-v3.txt, 3996-v4.txt, HBase-3996.patch
>
>
> It seems that in many cases feeding data from multiple tables or multiple scanners on
a single table can save a lot of time when running map/reduce jobs.
> I propose a new MultiTableInputFormat class that would allow doing this.

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