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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-621) Exposing MiniDFS and MiniMR clusters as a single process command-line
Date Tue, 15 Sep 2009 21:31:57 GMT
Exposing MiniDFS and MiniMR clusters as a single process command-line
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                 Key: HDFS-621
                 URL: https://issues.apache.org/jira/browse/HDFS-621
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: test, tools
            Reporter: Philip Zeyliger
            Priority: Minor


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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