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From "Michel Tourn (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-542) on-the-fly merge sort, HADOOP-540, reformat
Date Mon, 18 Sep 2006 16:53:23 GMT
on-the-fly merge sort, HADOOP-540, reformat
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                 Key: HADOOP-542
                 URL: http://issues.apache.org/jira/browse/HADOOP-542
             Project: Hadoop
          Issue Type: New Feature
          Components: contrib/streaming
         Environment: Tested on Linux and Windows

            Reporter: Michel Tourn


A large patch for streaming. Changes:

Support for on-the-fly merge sort of multiple map input files.
This supposes that the inputs are already sorted.

Support for reducer-NONE side-effects to a single local output with DFS inputs.
This can be used to do an on-the-fly merge-sort of remote sorted files.
(Compare to DFSShell -getmerge which does *catenation* of remote sorted files)
The single output can be a regular file, a named pipe or a socket.
URI Syntax: -mapsideoutput [file:/C:/win|file:/unix/|socket://host:port]

Add an optional JUnit test for on-the-fly merge-sort.
It requires Unix tools. It also works with cygwin.

If it has been more than 10 secs since last time we did this:
call reporter.setStatus() when consuming a stderr line from the Application.
Calling setStatus with reducer-NONE was already done as part of HADOOP-413.
So overall this resolves HADOOP-540.

Reformat streaming code to conform to Hadoop conventions 
 (indent 2 spaces, opening bracket on same-line) 


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