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https://issues.apache.org/jira/browse/MAPREDUCE-987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy closed MAPREDUCE-987.
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> 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
> Affects Versions: 1.2.0, 2.0.2-alpha
> Reporter: Philip Zeyliger
> Assignee: Ahmed Radwan
> Priority: Minor
> Fix For: 1.2.0, 2.0.2-alpha
>
> Attachments: HDFS-621-0.20-patch, HDFS-621.patch,
> MAPREDUCE-987_branch-1.0.patch, MAPREDUCE-987_branch-1.0_rev2.patch,
> MAPREDUCE-987.patch, MAPREDUCE-987.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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