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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