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MapReduce, mail # user - question about using java in streaming mode
Siddhartha Jonnalagadda
2011-06-05, 05:16
Siddhartha Jonnalagadda
2011-06-05, 20:01
Siddhartha Jonnalagadda
2011-06-05, 20:18
Marcos Ortiz
2011-06-05, 21:52
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Siddhartha Jonnalagadda 2011-06-05, 05:16
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Re: question about using java in streaming mode
Marcos Ortiz Valmaseda 2011-06-05, 17:59
Why are using Java in streming mode instead use the native Mapper/Reducer code?
Can you show to us the JobTracker's logs?

Regards
----- Mensaje original -----
De: "Siddhartha Jonnalagadda" <[EMAIL PROTECTED]>
Para: [EMAIL PROTECTED]
Enviados: Domingo, 5 de Junio 2011 7:16:08 GMT +01:00 Amsterdam / Berl��n / Berna / Roma / Estocolmo / Viena
Asunto: question about using java in streaming mode

Hi,
I was able use streaming in hadoop using python for the wordcount program, but created a Mapper and Reducer in Java since all my code is currently in Java.
I first tried this:
echo “foo foo quux labs foo bar quux” |java -cp ~/dummy.jar WCMapper | sort | java -cp ~/dummy.jar WCReducer

It gave the correct output:
labs 1
foo 3
bar 1
quux 2

Then, I installed a single-node cluster in hadoop and tried this: hadoop jar contrib/streaming/hadoop-streaming-0.20.203.0.jar -mapper “java -cp ~/dummy.jar WCMapper” -reducer “java -cp ~/dummy.jar WCReducer” -input gutenberg/* -output gutenberg-output -file dummy.jar (by tailoring the python command)

This is the error:
hadoop@siddhartha-laptop:/usr/local/hadoop$ hadoop jar contrib/streaming/hadoop-streaming-0.20.203.0.jar -mapper “java -cp ~/dummy.jar WCMapper” -reducer “java -cp ~/dummy.jar WCReducer” -input gutenberg/* -output gutenberg-output -file dummy.jar
packageJobJar: [dummy.jar, /app/hadoop/tmp/hadoop-unjar5573454211442575176/] [] /tmp/streamjob6721719460213928092.jar tmpDir=null
11/06/04 20:47:15 INFO mapred.FileInputFormat: Total input paths to process : 3
11/06/04 20:47:15 INFO streaming.StreamJob: getLocalDirs(): [/app/hadoop/tmp/mapred/local]
11/06/04 20:47:15 INFO streaming.StreamJob: Running job: job_201106031901_0039
11/06/04 20:47:15 INFO streaming.StreamJob: To kill this job, run:
11/06/04 20:47:15 INFO streaming.StreamJob: /usr/local/hadoop/bin/../bin/hadoop job -Dmapred.job.tracker=localhost:54311 -kill job_201106031901_0039
11/06/04 20:47:15 INFO streaming.StreamJob: Tracking URL: http://localhost:50030/jobdetails.jsp?jobid=job_201106031901_0039
11/06/04 20:47:16 INFO streaming.StreamJob: map 0% reduce 0%
11/06/04 20:48:00 INFO streaming.StreamJob: map 100% reduce 100%
11/06/04 20:48:00 INFO streaming.StreamJob: To kill this job, run:
11/06/04 20:48:00 INFO streaming.StreamJob: /usr/local/hadoop/bin/../bin/hadoop job -Dmapred.job.tracker=localhost:54311 -kill job_201106031901_0039
11/06/04 20:48:00 INFO streaming.StreamJob: Tracking URL: http://localhost:50030/jobdetails.jsp?jobid=job_201106031901_0039
11/06/04 20:48:00 ERROR streaming.StreamJob: Job not successful. Error: NA
11/06/04 20:48:00 INFO streaming.StreamJob: killJob…
Streaming Job Failed!

Any advice?
Sincerely,
Siddhartha Jonnalagadda,
Text mining Researcher, Lnx Research, LLC, Orange, CA
sjonnalagadda.wordpress.com

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--
Marcos Luís Ortíz Valmaseda
 Software Engineer (Large-Scaled Distributed Systems)
http://marcosluis2186.posterous.com
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Siddhartha Jonnalagadda 2011-06-05, 20:01
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Siddhartha Jonnalagadda 2011-06-05, 20:18
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Marcos Ortiz 2011-06-05, 21:52