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Posted to mapreduce-issues@hadoop.apache.org by "Chris Douglas (JIRA)" <ji...@apache.org> on 2009/11/05 07:03:32 UTC
[jira] Updated: (MAPREDUCE-987) Exposing MiniDFS and MiniMR
clusters as a single process command-line
[ https://issues.apache.org/jira/browse/MAPREDUCE-987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Douglas updated MAPREDUCE-987:
------------------------------------
Status: Open (was: Patch Available)
> 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
>
>
> 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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