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https://issues.apache.org/jira/browse/HADOOP-13320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15359233#comment-15359233
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ASF GitHub Bot commented on HADOOP-13320:
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GitHub user pippobaudos opened a pull request:
https://github.com/apache/hadoop/pull/108
HADOOP-13320. Fix arguments check in the WordCount v2.0 in Documentation
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/pippobaudos/hadoop HADOOP-13320
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/hadoop/pull/108.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #108
----
commit 469bc02c6f932bc55fced96de33884cebbe92242
Author: Niccolo Becchi <[email protected]>
Date: 2016-06-24T13:50:24Z
HADOOP-13320. Fix arguments check in the WordCount v2.0 in Doc. Contributed
by Niccolo Becchi
----
> 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: Trivial
>
> 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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