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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 Tue, 20 Mar 2012 18:27:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233650#comment-13233650
] 

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

w.r.t. test failure:
https://builds.apache.org/job/PreCommit-HBASE-Build/1230//testReport/org.apache.hadoop.hbase.mapreduce/TestMultiTableInputFormat/testScanEmptyToEmpty/

You can find the following:
{code}
2012-03-20 05:32:21,778 DEBUG [pool-1-thread-1] mapreduce.MultiTableInputFormatBase(143):
getSplits: split -> 24 -> asf011.sp2.ygridcore.net:yyy,
java.lang.NumberFormatException: For input string: "18446743988250694508"
	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)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1083)
{code}
We really need next release of hadoop 1.0 where MAPREDUCE-3583 is fixed.

w.r.t. Bohdan's question, there're two outstanding review comments on https://reviews.apache.org/r/4411/
where response from Eran would help clarify.
                
> 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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