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Date: Mon, 16 Oct 2006 14:48:36 -0700 (PDT)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-477) Streaming should execute Unix commands
 and scripts in well known languages without user specifying the path
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     [ http://issues.apache.org/jira/browse/HADOOP-477?page=all ]

Doug Cutting updated HADOOP-477:
--------------------------------

           Status: Resolved  (was: Patch Available)
    Fix Version/s: 0.8.0
       Resolution: Fixed

I just committed this.  Thanks, Dhruba!

> Streaming should execute Unix commands and scripts in well known languages without user specifying the path
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-477
>                 URL: http://issues.apache.org/jira/browse/HADOOP-477
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/streaming
>            Reporter: arkady borkovsky
>         Assigned To: dhruba borthakur
>             Fix For: 0.8.0
>
>         Attachments: streamingpath.patch
>
>
> 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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