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From "Attila Pados (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5655) Remote job submit from windows to a linux hadoop cluster fails due to wrong classpath
Date Tue, 26 Nov 2013 13:16:35 GMT
Attila Pados created MAPREDUCE-5655:
---------------------------------------

             Summary: Remote job submit from windows to a linux hadoop cluster fails due to
wrong classpath
                 Key: MAPREDUCE-5655
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5655
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client, job submission
    Affects Versions: 2.2.0
         Environment: Client machine is a Windows 7 box, with Eclipse
Remote: there is a multi node hadoop cluster, installed on Ubuntu boxes (any linux)
            Reporter: Attila Pados


I was trying to run a java class on my client, windows 7 developer environment, which submits
a job to the remote Hadoop cluster, initiates a mapreduce there, and then downloads the results
back to the local machine.

General use case is to use hadoop services from a web application installed on a non-cluster
computer, or as part of a developer environment.

The problem was, that the ApplicationMaster's startup shell script (launch_container.sh) was
generated with wrong CLASSPATH entry. Together with the java process call on the bottom of
the file, these entries were generated in windows style, using % as shell variable marker
and ; as the CLASSPATH delimiter.

I tracked down the root cause, and found that the MrApps.java, and the YarnRunner.java classes
create these entries, and is passed forward to the ApplicationMaster, assuming that the OS
that runs these classes will match the one running the ApplicationMaster. But it's not the
case, these are in 2 different jvm, and also the OS can be different, the strings are generated
based on the client/submitter side's OS.

I made some workaround changes to these 2 files, so i could launch my job, however there may
be more problems ahead.



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