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 / Berlín / 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 Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- Marcos Luís Ortíz Valmaseda Software Engineer (Large-Scaled Distributed Systems) http://marcosluis2186.posterous.com
