NativeMapReduce does not Allow Configuration Parameters containing Spaces
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Key: PIG-1917
URL: https://issues.apache.org/jira/browse/PIG-1917
Project: Pig
Issue Type: Bug
Reporter: Mitesh Singh Jat
In Pig, NativeMapReduce does not allow Configuration parameters which contain
spaces.
Considering a simple pig script with ''wordcount'' as Native M-R job.
{code:title=nativeMR.pig}
A = load 'input/WordCountInput.txt';
B = MAPREDUCE 'hadoop-examples.jar' Store A into 'inputDir' Load 'outputDir' as
(word:chararray, count:int) `wordcount -Dmapred.job.map.memory.mb=3072
-Dmapred.child.java.opts="-Xmx1536m -Xss128k" inputDir outputDir`;
store B into 'output/WordCount' using PigStorage;
{code}
The above pig script fails while launching native MAPREDUCE job. Because space
after '' -Dmapred.child.java.opts="-Xmx1536m'' makes
'' -Xss128k"'' as the first argument to '''wordcount'''.
Even with other example M-R program, the parameter ''mapred.child.java.opts''
was assigned ''"-Xmx1536m'' in Jobconf.
Physical plan, Logical plan, and M-R plan of pig show double quotes.
For example, here is the corresponding M-R Plan for the native M-R "MAPREDUCE"
statement.
{monospace}
MapReduce node scope-13
hadoop jar hadoop-examples.jar wordcount -Dmapred.job.map.memory.mb=3072
-Dmapred.child.java.opts="-Xmx1536m -Xss128k" inputDir outputDir
--------
{monospace}
On executing above M-R job after copying 'input/WordCountInput.txt' into
'inputDir/', as Hadoop Job, this ran successfully.
{monospace}
$ *hadoop jar hadoop-examples.jar wordcount -Dmapred.job.map.memory.mb=3072
-Dmapred.child.java.opts="-Xmx1536m -Xss128k" inputDir outputDir*
11/03/18 14:23:29 INFO input.FileInputFormat: Total input paths to process : 1
11/03/18 14:23:29 INFO mapred.JobClient: Running job: job_201103181353_0007
11/03/18 14:23:30 INFO mapred.JobClient: map 0% reduce 0%
11/03/18 14:23:37 INFO mapred.JobClient: map 100% reduce 0%
11/03/18 14:23:49 INFO mapred.JobClient: map 100% reduce 100%
11/03/18 14:23:51 INFO mapred.JobClient: Job complete: job_201103181353_0007
...
...
{monospace}
Whereas, when '' -Dmapred.child.java.opts=-Xmx1536m'' was used, the
*nativeMR.pig* executed successfully.
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