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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (MAPREDUCE-4888) NLineInputFormat drops data in 1.1 and beyond
Date Thu, 20 Dec 2012 01:45:12 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Vinod Kumar Vavilapalli reassigned MAPREDUCE-4888:

    Assignee: Vinod Kumar Vavilapalli

Bobby, taking this over. Thanks for your analysis and the test-case, it made my job easier.
> NLineInputFormat drops data in 1.1 and beyond
> ---------------------------------------------
>                 Key: MAPREDUCE-4888
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4888
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv1
>    Affects Versions: 1.1.0
>            Reporter: Robert Joseph Evans
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Blocker
>         Attachments: test.patch
> When trying to root cause why MAPREDUCE-4782 did not cause us issues on 1.0.2, I found
out that HADOOP-7823 introduced essentially the exact same error into org.apache.hadoop.mapred.lib.NLineInputFormat.
> In 1.X org.apache.hadoop.mapred.lib.NLineInputFormat and org.apache.hadoop.mapreduce.lib.input.NLineInputFormat
are separate implementations.  The latter had an off by one error in it until MAPREDUCE-4782
fixed it. The former had no error in it until HADOOP-7823 introduced it in 1.1 and MAPREDUCE-375
combined the implementations together but picked the implementation with the off by one error
in 0.21.
> I will attach a patch that exposes the error.

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