How can I get functional test code coverage reports for mapreduce program.

I want to generate functional test coverage reprots for map reduce program.

first I generate the instrumented artifacts along with the clover.db file

  • Setup Clover configuration in the main pom file
<logcheck>^if *\((logger|log|LOG|LOGGER)\.is.*</logcheck>
  • Run the following command to do instrument, generate instrumented jars and create a clover registry file clover.db
mvn clean clover2:setup install -Dmaven.test.skip=true -Dmaven.clover.singleCloverDatabase=false
After that, I run the functional test and hope that the code coverage information can be writen to the clover.db.
But, because the program is mapreduce program, it is not run locally.

What I should do to make the mapreduce job write code coverage informaton to the clover.db when it runs.

4 answers

This widget could not be displayed.

Hi Jin,

You're using quite old version of Clover-for-Maven - 2.5.1 - I recommend upgrading to the latest version which is 3.1.5.

Have you seen a tutorial on CLOVER/Working+with+Distributed+Applications page?


This widget could not be displayed.

Thanks Marek.

I saw the tutorial page, but it seems not help.

The program is mapreduce program. When it runs, it run on task tracker nodes.

We tried to let the program write coverage info to the tmp cache db file on task tracker nodes, but when the job finished, the tmp cache file is cleaned, we can not get the coverage info.

So far, I think if the clover instrumented program can read and write db file on HDFS, it can solve the problem.



This widget could not be displayed.

Yes, you can use a shared network drive so that all tracker nodes will write to the same location. You can either:

1) specify clover.db path during source code instrumentation in your pom.xml by defining a following property for clover2:instrument or clover2:setup goal:


2) or override this value in runtime by a java property:


Please note that in case when your application consists of multiple Maven modules, you should compile sources with the single Clover dabatase option (unless you want to deal with multiple databases in multiple locations and merge them after testing):



This widget could not be displayed.

Update: I've read more details about HDFS in the documentation and it's rather unlikely that Clover will work on it without modifications - I expected that HDFS works transparently like NFS, but it looks that it's a completely different architecture and API. Sorry for a confusion.

Clover has no API for handling HDFS. However, I have raised a feature request for this, feel free to vote on it:

Suggest an answer

Log in or Sign up to answer
Atlassian Summit 2018

Meet the community IRL

Atlassian Summit is an excellent opportunity for in-person support, training, and networking.

Learn more
Community showcase
Published 55m ago in Bitbucket

Branch Management with Bitbucket

As a project manager, I have discovered that different developers want to bring their previous branching method with them when they join the team. Some developers are used to performing individual wo...

15 views 0 3
Read article

Atlassian User Groups

Connect with like-minded Atlassian users at free events near you!

Find a group

Connect with like-minded Atlassian users at free events near you!

Find my local user group

Unfortunately there are no AUG chapters near you at the moment.

Start an AUG

You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs

Groups near you