[jira] Commented: (MAPREDUCE-987) Exposing MiniDFS and MiniMR clusters as a single process command-line

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764538#action_12764538 ] 

Hadoop QA commented on MAPREDUCE-987:
-------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12419700/MAPREDUCE-987.patch
  against trunk revision 823227.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 5 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/158/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/158/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/158/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/158/console

This message is automatically generated.

> 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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