[jira] [Updated] (HADOOP-13320) Fix arguments check in the WordCount v2.0 in the MapReduce Documentation

["niccolo becchi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-13320?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

niccolo becchi updated HADOOP-13320:
------------------------------------
    Summary: Fix arguments check in the WordCount v2.0 in the MapReduce Documentation   (was: Fix arguments check in the WordCount v2.0 in the MapReduce Doc)

> Fix arguments check in the WordCount v2.0 in the MapReduce Documentation 
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-13320
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13320
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: documentation
>            Reporter: niccolo becchi
>            Priority: Trivial
>
> The actual arguments check is wrong, as it's never printing the message of the correct usage. So, running the code with a wrong number of parameters we get the exception:
> yarn jar /var/tmp/WordCount.jar task0.WordCount2
> 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)
> Intead than the expected message
>  Usage: wordcount <in> <out> [-skip skipPatternFile]



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