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From "niccolo becchi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13320) Fix arguments check in the WordCount v2.0 in the MapReduce Doc
Date Fri, 24 Jun 2016 13:41:16 GMT
niccolo becchi created HADOOP-13320:

             Summary: Fix arguments check in the WordCount v2.0 in the MapReduce Doc
                 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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