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From "Zhihong Yu (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 Wed, 28 Mar 2012 18:31:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240608#comment-13240608
] 

Zhihong Yu commented on HBASE-3996:
-----------------------------------

Test failure for patch v6 was due to MAPREDUCE-3583:
{code}
attempt_20120328173919786_0001_m_000100_1: 	at org.apache.hadoop.mapred.Child.main(Child.java:249)
java.lang.NumberFormatException: For input string: "18446743988103913343"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
	at java.lang.Long.parseLong(Long.java:422)
	at java.lang.Long.parseLong(Long.java:468)
	at org.apache.hadoop.util.ProcfsBasedProcessTree.constructProcessInfo(ProcfsBasedProcessTree.java:413)
	at org.apache.hadoop.util.ProcfsBasedProcessTree.getProcessTree(ProcfsBasedProcessTree.java:148)
	at org.apache.hadoop.util.LinuxResourceCalculatorPlugin.getProcResourceValues(LinuxResourceCalculatorPlugin.java:401)
	at org.apache.hadoop.mapred.Task.initialize(Task.java:536)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:353)
	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
{code}
                
> 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: 0.96.0
>
>         Attachments: 3996-v2.txt, 3996-v3.txt, 3996-v4.txt, 3996-v5.txt, 3996-v6.txt,
3996-v7.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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