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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6038) A boolean may be set error in the Word Count v2.0 in MapReduce Tutorial
Date Tue, 07 Jul 2015 17:33:06 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14617028#comment-14617028

Hudson commented on MAPREDUCE-6038:

FAILURE: Integrated in Hadoop-trunk-Commit #8126 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/8126/])
MAPREDUCE-6038. A boolean may be set error in the Word Count v2.0 in MapReduce Tutorial. Contributed
by Tsuyoshi Ozawa (cdouglas: rev 7e2fe8c9f28ec6fff32741ebf1bdbf47729d9eaf)
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/site/markdown/MapReduceTutorial.md
* hadoop-mapreduce-project/CHANGES.txt

> A boolean may be set error in the Word Count v2.0 in MapReduce Tutorial
> -----------------------------------------------------------------------
>                 Key: MAPREDUCE-6038
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6038
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>         Environment: java version 1.8.0_11 hostspot 64-bit
>            Reporter: Pei Ma
>            Assignee: Tsuyoshi Ozawa
>            Priority: Minor
>              Labels: BB2015-05-TBR
>             Fix For: 2.8.0
>         Attachments: MAPREDUCE-6038.1.patch, MAPREDUCE-6038.2.patch
> As a beginner, when I learned about the basic of the mr, I found that I cound't run the
WordCount2 using the command "bin/hadoop jar wc.jar WordCount2 /user/joe/wordcount/input /user/joe/wordcount/output"
in the Tutorial. The VM throwed the NullPoniterException at the line 47. In the line 45, the
returned default value of "conf.getBoolean" is true. That is to say  when "wordcount.skip.patterns"
is not set ,the WordCount2 will continue to execute getCacheFiles.. Then patternsURIs gets
the null value. When the "-skip" option dosen't exist,  "wordcount.skip.patterns" will not
be set. Then a NullPointerException come out.
> At all, the block after the if-statement in line no. 45 shoudn't be executed when the
"-skip" option dosen't exist in command. Maybe the line 45 should like that  "if (conf.getBoolean("wordcount.skip.patterns",
false)) { "
> .Just change the boolean.

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