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From "arkady borkovsky (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-477) Streaming should execute Unix commands and scripts in well known languages without user specifying the path
Date Thu, 24 Aug 2006 23:39:13 GMT
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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