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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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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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

Hi Marcos,

I thought that streaming would make it easier because I was getting
different errors with extending mapper and reducer in java.

I tried: hadoop jar contrib/streaming/hadoop-streaming-0.20.203.0.jar -file
dummy.jar -mapper "java -cp dummy.jar WCMapper" -reducer "java -cp dummy.jar
WCReducer" -input gutenberg/* -output gutenberg-output

The error log in the map task:
*stderr logs*

Exception in thread "main" java.lang.NoClassDefFoundError: WCMapper
Caused by: java.lang.ClassNotFoundException: WCMapper
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

Could not find the main class: WCMapper.  Program will exit.
java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess
failed with code 1
at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)

at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
at org.apache.hadoop.streaming.PipeMapper.map(PipeMapper.java:121)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)

at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:435)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
at java.security.AccessController.doPrivileged(Native Method)

at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
at org.apache.hadoop.mapred.Child.main(Child.java:253)
java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess
failed with code 1

at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)

at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:435)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)

at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)

at org.apache.hadoop.mapred.Child.main(Child.java:253)

------------------------------

Sincerely,
Siddhartha Jonnalagadda,
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.

On Sun, Jun 5, 2011 at 10:59 AM, Marcos Ortiz Valmaseda <[EMAIL PROTECTED]>wrote:

> 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

This sounds stupid, but the mapper part now works fine, if i use -files
dummy.jar instead of -file dummy.jar.

The reducer is going into an infinite loop (0%, 22%, 0%, ...), but I will
figure that out later!

Sincerely,
Siddhartha Jonnalagadda,
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.

On Sun, Jun 5, 2011 at 1:01 PM, Siddhartha Jonnalagadda
<[EMAIL PROTECTED]>wrote:

> Hi Marcos,
>
> I thought that streaming would make it easier because I was getting
> different errors with extending mapper and reducer in java.
>
> I tried: hadoop jar contrib/streaming/hadoop-streaming-0.20.203.0.jar -file
> dummy.jar -mapper "java -cp dummy.jar WCMapper" -reducer "java -cp dummy.jar
> WCReducer" -input gutenberg/* -output gutenberg-output
>
> The error log in the map task:
> *stderr logs*
>
> Exception in thread "main" java.lang.NoClassDefFoundError: WCMapper
> Caused by: java.lang.ClassNotFoundException: WCMapper
> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> at java.security.AccessController.doPrivileged(Native Method)
>
>
> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>
>
> Could not find the main class: WCMapper.  Program will exit.
> java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
> at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
>
>
> at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
> at org.apache.hadoop.streaming.PipeMapper.map(PipeMapper.java:121)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
>
>
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:435)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
> at java.security.AccessController.doPrivileged(Native Method)
>
>
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
> at org.apache.hadoop.mapred.Child.main(Child.java:253)
> java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
>
>
> at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
> at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
> at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)
>
>
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
> at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:435)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
>
>
> at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
>
>
> at org.apache.hadoop.mapred.Child.main(Child.java:253)
>
> ------------------------------
>
>
>
> Sincerely,
>  Siddhartha Jonnalagadda,
> 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

El 6/5/2011 4:01 PM, Siddhartha Jonnalagadda escribi�:
> Hi Marcos,
>
> I thought that streaming would make it easier because I was getting
> different errors with extending mapper and reducer in java.
>
> I tried: hadoop jar contrib/streaming/hadoop-streaming-0.20.203.0.jar
> -file dummy.jar -mapper "java -cp dummy.jar WCMapper" -reducer "java
> -cp dummy.jar WCReducer" -input gutenberg/* -output gutenberg-output
>
> The error log in the map task:
> *_stderr logs_*
> Exception in thread "main" java.lang.NoClassDefFoundError: WCMapper
> Caused by: java.lang.ClassNotFoundException: WCMapper
>    
Which is the definition of your ClassPath? Because, this error is caused
where the system can not find
the definition of a class.
> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> at java.security.AccessController.doPrivileged(Native Method)
>
>
> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>
>
> Could not find the main class: WCMapper.  Program will exit.
> java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
> at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
>
>
> at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
> at org.apache.hadoop.streaming.PipeMapper.map(PipeMapper.java:121)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
>
>
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:435)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
> at java.security.AccessController.doPrivileged(Native Method)
>
>
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
> at org.apache.hadoop.mapred.Child.main(Child.java:253)
> java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
>
>
> at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
> at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
> at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)
>
>
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
> at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:435)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
>
>
> at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
>
>
> at org.apache.hadoop.mapred.Child.main(Child.java:253)
>    
> ------------------------------------------------------------------------
>
>
>
> Sincerely,
> Siddhartha Jonnalagadda,
> sjonnalagadda.wordpress.com <http://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.
>
>
>
>
>
>
> On Sun, Jun 5, 2011 at 10:59 AM, Marcos Ortiz Valmaseda
> <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote:
>
>     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]
Marcos Lu�s Ort�z Valmaseda
  Software Engineer (UCI)
  http://marcosluis2186.posterous.com
  http://twitter.com/marcosluis2186