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Date: Fri, 3 Apr 2009 05:10:12 -0700 (PDT)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5621) MapReducer to run junit tests under
 Hadoop
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    [ https://issues.apache.org/jira/browse/HADOOP-5621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695354#action_12695354 ] 

Steve Loughran commented on HADOOP-5621:
----------------------------------------


I should add that my prototype work is currently in a different SCM repo, still LGPL, but moving to Apache licensed shortly. 

http://smartfrog.svn.sourceforge.net/viewvc/smartfrog/trunk/core/components/hadoop/src/org/smartfrog/services/hadoop/junitmr/

One thing I also do in this code is pass down a configuration to every test case. This will give the hadoop-only tests more information. It would make them only work in this test runner though. 

{code}
if (testSuite instanceof JUnitHadoopContext) {
    JUnitHadoopContext ctx = (JUnitHadoopContext) testSuite;
    ctx.setConfiguration(context.getConfiguration());
}
{code}

The listresources task, to create a text file listing all tests in a source tree, is elsewhere
http://smartfrog.svn.sourceforge.net/viewvc/smartfrog/trunk/core/extras/ant/src/org/smartfrog/tools/ant/

this stuff is just a start
# need to capture the IO streams
# need the post-processing
# the test runner probably needs to be more robust
# I'd like to add a SkippedException so that when a test case chooses not to run, it throws that and the outcome is logged differently.


> MapReducer to run junit tests under Hadoop
> ------------------------------------------
>
>                 Key: HADOOP-5621
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5621
>             Project: Hadoop Core
>          Issue Type: New Feature
>    Affects Versions: 0.21.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>
> This is something I mentioned to some people last week, thought I would start a discussion on it.
> We could run junit tests as a MapReduce job with
> # a mapper that takes a list of classes, one per line
> # extracts the test suite from each class, and then invokes each test method. This would be a new junit test runner.
> # saves the result (and any exceptions) as the output. Also saves any machine specific details. 
> # It also needs to grab the System.out and System.err channels, to map them to specific tests.
> # Measure how long the tests took (incuding setup/teardown time)
> # Add an ant task <listresources> to take filesets and other patterns, and generate text files from the contents (with stripping of prefixes and suffices, directory separator substition, file begin/end values, etc, etc). I have this with tests already.
> The result would be that you could point listresources at a directory tree and create a text file listing all tests to run. These could be executed across multiple hosts and the results correlated. It would be, initially, a MapExpand, as the output would be bigger than the input
> Feature creep then becomes the analysis
> # Add another MR class which runs through all failing tests and creates a new list of test classes that failed. This could be rescheduled on different runs, and makes for a faster cycle (only run failing tests until they work)
> # Add something to only get failing tests, summarise them (somehow) in a user readable form
> # Something to get partially failing tests and highlight machine differences. 
> # Add something to compare tests over time, detect those which are getting slower?
> # an MR to regenerate the classic Ant junit XML reports, for presentation in other tools (like hudson)

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