Streaming should execute Unix commands and scripts in well known languages
without user specifying the path
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Key: HADOOP-477
URL: http://issues.apache.org/jira/browse/HADOOP-477
Project: Hadoop
Issue Type: Bug
Components: contrib/streaming
Reporter: arkady borkovsky
If the executables for -mapper or -reducer are well-known (grep, cat, awk),
Streaming should make sure that the executable is found.
If a script for -mapper or -reducer are in a well-known language (.pl, .py),
Streaming should execute it with the correct language processor.
Reason:
many jobs get started from machines with a different environment from that on
the cluster.
On another hand, different clusters may have different environments.
Also, a user may have no access to the cluster machines.
Because of this, a user may be unable to specify correct paths for standard
commands, and correct language processors for scripts.
Implementation:
Stream may tailr the commands by prepending the path, or the name of language
processor.
Another solution is to make sure that the commands are executed in a
"meaningful" environment (with good $PATH, and other variables Unix users are
accustomed to count upon).
Once again, Streaming is user facing tool -- it is not a library or a hackable
example that the users are to modify for their needs. So it should work out of
the box.
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