Jobs fail with mapper error 'Cannot run program "python" '

[Robert Schiemann]

I'm running CDH3U0 installed via SCM on Centos5 x64 with Python 2.6.6.
Streaming jobs using python scripts complete successfully. Using
dumbo, however, causes the mapping tasks to fail with the following
error: "java.io.IOException: Cannot run program "python":
java.io.IOException: error=2, No such file or directory". I've checked
on all of the machines, and the active user, root, hdfs, and mapred
all have access to the python binary and can start a python shell by
executing "python". I'm fairly sure it's a configuration issue, but
searching google and stackoverflow haven't yielded any results.

Thanks!
Robert

[Norbert Burger]

What does your shebang line (#!) in your python scripts look like?  Perhaps it refers to an interpreter location that doesn't exist?  I often use "#!/usr/bin/env python" in these cases.

Norbert

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