[ http://issues.apache.org/jira/browse/HADOOP-477?page=all ]
dhruba borthakur updated HADOOP-477:
------------------------------------
Attachment: streamingpath.delta
This allows a streaming job to be able to invoke standard utilities (e.g. grep,
wc, etc) without specifying their full path. Feedback appreciated.
> 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
> Attachments: streamingpath.delta
>
>
> 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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