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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13320) Fix arguments check in documentation for WordCount v2.0
Date Thu, 07 Jul 2016 22:32:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15366892#comment-15366892
] 

ASF GitHub Bot commented on HADOOP-13320:
-----------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/hadoop/pull/108


> Fix arguments check in documentation for WordCount v2.0
> -------------------------------------------------------
>
>                 Key: HADOOP-13320
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13320
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: documentation
>            Reporter: niccolo becchi
>            Priority: Minor
>
> This issue is affecting the documentation page, so the code is not covered by any tests.
It's actually visible on the page:
> https://hadoop.apache.org/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html#Example:_WordCount_v2.0
> On the Example: WordCount v2.0 
> The actual arguments check is wrong, as it's never printing the message of the correct
usage. So, running the code with no parameters, as in the following example:
> {code}
> yarn jar /var/tmp/WordCount.jar task0.WordCount2
> {code}
>  
> I have got the following exception message in output:
> {code}
> Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
>     at java.util.ArrayList.rangeCheck(ArrayList.java:635)
>     at java.util.ArrayList.get(ArrayList.java:411)
>     at task0.WordCount2.main(WordCount2.java:131)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:606)
>     at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
>     at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
> {code}
> Intead than the expected friendly message:
> {code}
>  Usage: wordcount <in> <out> [-skip skipPatternFile]
> {code}



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