niccolo becchi created HADOOP-13320:
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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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