MapReducer to run junit tests under Hadoop
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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
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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