[ https://issues.apache.org/jira/browse/MAPREDUCE-987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Philip Zeyliger moved HDFS-621 to MAPREDUCE-987: ------------------------------------------------ Component/s: (was: tools) (was: test) test build Key: MAPREDUCE-987 (was: HDFS-621) Project: Hadoop Map/Reduce (was: Hadoop HDFS) > 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 > > > 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.