Pei Ma created MAPREDUCE-6038:
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Summary: A boolean may be set error in the Word Count v2.0 in
MapReduce Tutorial
Key: MAPREDUCE-6038
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6038
Project: Hadoop Map/Reduce
Issue Type: Bug
Environment: java version 1.8.0_11 hostspot 64-bit
Reporter: Pei Ma
Priority: Minor
As a beginner, when I learned about the basic of the mr, I found that I cound't
run the WordCount2 using the command "bin/hadoop jar wc.jar WordCount2
/user/joe/wordcount/input /user/joe/wordcount/output" in the Tutorial. The VM
throwed the NullPoniterException at the line 47. In the line 45, the returned
default value of "conf.getBoolean" is true. That is to say when
"wordcount.skip.patterns" is not set ,the WordCount2 will continue to execute
getCacheFiles.. Then patternsURIs gets the null value. When the "-skip" option
dosen't exist, "wordcount.skip.patterns" will not be set. Then a
NullPointerException come out.
At all, the block after the if-statement in line no. 45 shoudn't be executed
when the "-skip" option dosen't exist in command. Maybe the line 45 should like
that "if (conf.getBoolean("wordcount.skip.patterns", false)) { "
.Just change the boolean.
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