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Owen O'Malley commented on HDFS-621: ------------------------------------ I would rather that the local runner be made to work better than fake a mini cluster. For testing the framework, the mini cluster makes sense. But I think that for testing applications, the local runner is a much better fit. > Exposing MiniDFS and MiniMR clusters as a single process command-line > --------------------------------------------------------------------- > > 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 > Attachments: HDFS-621.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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.