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Date: Sat, 21 Jul 2012 16:27:35 +0000 (UTC)
From: "Alejandro Abdelnur (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-987) Exposing MiniDFS and MiniMR
 clusters as a single process command-line
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419869#comment-13419869 ] 

Alejandro Abdelnur commented on MAPREDUCE-987:
----------------------------------------------

Thanks Ahmed. Committed to trunk and branch-2, I'll leave it open until we have the patch with docs for branch-1 and we commit it there.
                
> Exposing MiniDFS and MiniMR clusters as a single process command-line
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-987
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-987
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: build, test
>            Reporter: Philip Zeyliger
>            Assignee: Philip Zeyliger
>            Priority: Minor
>         Attachments: HDFS-621-0.20-patch, HDFS-621.patch, MAPREDUCE-987.patch, MAPREDUCE-987.patch, MAPREDUCE-987_branch-1.0.patch, MAPREDUCE-987_rev2.patch, MAPREDUCE-987_rev3.patch, MAPREDUCE-987_rev4.patch
>
>
> It's hard to test non-Java programs that rely on significant mapreduce functionality.  The patch I'm proposing shortly will let you just type "bin/hadoop jar hadoop-hdfs-hdfswithmr-test.jar minicluster" to start a cluster (internally, it's using Mini{MR,HDFS}Cluster) with a specified number of daemons, etc.  A test that checks how some external process interacts with Hadoop might start minicluster as a subprocess, run through its thing, and then simply kill the java subprocess.
> I've been using just such a system for a couple of weeks, and I like it.  It's significantly easier than developing a lot of scripts to start a pseudo-distributed cluster, and then clean up after it.  I figure others might find it useful as well.
> I'm at a bit of a loss as to where to put it in 0.21.  hdfs-with-mr tests have all the required libraries, so I've put it there.  I could conceivably split this into "minimr" and "minihdfs", but it's specifically the fact that they're configured to talk to each other that I like about having them together.  And one JVM is better than two for my test programs.

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