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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3678) The Map tasks logs should have the value of input split it processed
Date Sun, 07 Oct 2012 12:56:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471221#comment-13471221
] 

Harsh J commented on MAPREDUCE-3678:
------------------------------------

Hi,

If no one has any objections to these INFO log additions, I'll commit it in in a couple of
days.

This helps projects such as Pig, Hive, etc. without any changes on their end.
                
> The Map tasks logs should have the value of input split it processed
> --------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3678
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3678
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: nodemanager, tasktracker
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Bejoy KS
>            Assignee: Harsh J
>         Attachments: MAPREDUCE-3678-branch-1.patch, MAPREDUCE-3678.patch
>
>
> It would be easier to debug some corner in tasks if we knew what was the input split
processed by that task. Map reduce task tracker log should accommodate the same. Also in the
jobdetails web UI, the split also should be displayed along with the Split Locations. 
> Sample as
> Input Split
> hdfs://myserver:9000/userdata/sampleapp/inputdir/file1.csv - <split no>/<offset
from beginning of file>
> This would be much beneficial to nail down some data quality issues in large data volume
processing.

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