Launching a shell command in reduce method with Java

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Permalink Reply by Jason Venner on February 19, 2010 at 8:32pm

I doubt that the hadoop script is in your path at task execution time.
You can check the value of the PATH environment variable. You may also try giving an explicit path starting from /.

In addition most of the commands you are trying to invoke via the shell in your example are available to you via the FsShell class.

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Permalink Reply by Aprile Matteo on February 20, 2010 at 1:51am

thx a lot for your answer but I must execute an esternal script that call a molecolar program. This command is "./yasara ........"
I alreay tried to use the FsShell class but it compare the same exception. I think that I could be a security error ...

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Permalink Reply by Jason Venner on February 20, 2010 at 9:41pm

My inclination is to thing this is a PATH environment variable issue or an issue with the command string you are trying to execute.

When I have to debug this class of problem, I pass a simple shell script via the distributed cache
-file test.sh
which must be executable

and within my java, I would launch ./test.sh

in the test.sh file. This should give you a feel for the runtime environment for any program you are trying to run.

#! /bin/sh

pwd
ls -l
echo $PATH
exit 0

Aprile Matteo said:

thx a lot for your answer but I must execute an esternal script that call a molecolar program. This command is "./yasara ........"
I alreay tried to use the FsShell class but it compare the same exception. I think that I could be a security error ...

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