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https://issues.apache.org/jira/browse/GIRAPH-146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13264925#comment-13264925
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Paolo Castagna commented on GIRAPH-146:
---------------------------------------

Giraph is using cobertura-maven-plugin which needs to instrument the byte code 
before running the unit tests for the second time. I've never managed to avoid 
this and some also argue that it would be wrong to do so, for example see:

 - 
http://stackoverflow.com/questions/8485559/managing-report-plugins-in-maven-site
 - http://stackoverflow.com/questions/4521564/hudson-and-maven-tests-run-twice
 - 
http://stackoverflow.com/questions/3421582/how-to-avoid-double-compilation-and-testing-with-coberturacheck

One person suggested to run <code>mvn clean install 
-Dmaven.test.skip=true</code> first and then <code>mvn cobertura:check</code>
                
> Maven is running the tests twice during builds
> ----------------------------------------------
>
>                 Key: GIRAPH-146
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-146
>             Project: Giraph
>          Issue Type: Bug
>          Components: build
>            Reporter: Jakob Homan
>
> I had a feeling the build time had jumped significantly... 

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