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https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559934#comment-13559934
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Ted Yu commented on HBASE-3996:
-------------------------------
If you search
https://builds.apache.org/job/PreCommit-HBASE-Build/4126//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.xml
for MultiTableInputFormatBase, you would see the following:
<BugInstance type="DMI_INVOKING_TOSTRING_ON_ARRAY" priority="2"
abbrev="USELESS_STRING" category="CORRECTNESS">
<Class classname="org.apache.hadoop.hbase.mapreduce.MultiTableInputFormatBase">
<SourceLine
classname="org.apache.hadoop.hbase.mapreduce.MultiTableInputFormatBase"
start="47" end="214" sourcefile="MultiTableInputFormatBase.java"
sourcepath="org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.java"/>
</Class>
Please address the above warning.
> 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: Bryan Baugher
> Priority: Critical
> Fix For: 0.96.0, 0.94.5
>
> Attachments: 3996-v10.txt, 3996-v11.txt, 3996-v12.txt, 3996-v13.txt,
> 3996-v2.txt, 3996-v3.txt, 3996-v4.txt, 3996-v5.txt, 3996-v6.txt, 3996-v7.txt,
> 3996-v8.txt, 3996-v9.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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