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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4782) NLineInputFormat skips first line of last InputSplit
Date Sat, 10 Nov 2012 12:43:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494650#comment-13494650

Hudson commented on MAPREDUCE-4782:

Integrated in Hadoop-Hdfs-0.23-Build #431 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/431/])
    svn merge -c 1407505 FIXES: MAPREDUCE-4782. NLineInputFormat skips first line of last
InputSplit (Mark Fuhs via bobby) (Revision 1407507)

     Result = UNSTABLE
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1407507
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/NLineInputFormat.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/lib/input/TestNLineInputFormat.java

> NLineInputFormat skips first line of last InputSplit
> ----------------------------------------------------
>                 Key: MAPREDUCE-4782
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4782
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.22.0, 0.23.0, 1.0.0, 2.0.0-alpha, trunk
>         Environment: job.setMapperClass(Mapper.class);  // just pass text lines through
to output
> job.setInputFormatClass(NLineInputFormat.class);
> NLineInputFormat.setNumLinesPerSplit(job, 100);
> NLineInputFormat.setInputPaths(job, "/path/to/a_file_with_many_lines.txt");
>            Reporter: Mark Fuhs
>            Assignee: Mark Fuhs
>            Priority: Blocker
>             Fix For: 1.1.1, 1.2.0, 3.0.0, 2.0.3-alpha, 0.23.5
>         Attachments: MAPREDUCE-4782.patch, MR-4782-branch-1.txt, MR-4782.txt
> NLineInputFormat creates FileSplits that are then used by LineRecordReader to generate
Text values. To deal with an idiosyncrasy of LineRecordReader, the begin and length fields
of the FileSplit are constructed differently for the first FileSplit vs. the rest.
> After looping through all lines of a file, the final FileSplit is created, but the creation
does not respect the difference of how the first vs. the rest of the FileSplits are created.
> This results in the first line of the final InputSplit being skipped. I've created a
patch to NLineInputFormat, and this fixes the problem.

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