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https://issues.apache.org/jira/browse/MAPREDUCE-3678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187427#comment-13187427
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Arun C Murthy commented on MAPREDUCE-3678:
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AFAIK MR1 already shows this in taskdetails.jsp - we need to add this to MR2.
Also, AFAIK, I thought MR1 task-logs had this info logged, something I see
missing in MR2 also.
> 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: 0.20.203.0, 0.20.205.0, 1.0.0
> Environment: Linux red hat.
> Reporter: Bejoy KS
>
> 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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