Allen Wittenauer commented on HADOOP-15190:

I was reminded today of HDFS-12711 which is still very much a problem.  (We're 
dropping between 30-70% of the unit test results in every patch run.)  Adding 
any sort of coverage code as part of the unit test runs is just going to make 
HDFS worse. Granted, not as bad as adding more unit tests or, forbid, a big 
functionality merge, but it will still add load and push it even farther off 
the cliff.

> Use Jacoco to generate Unit Test coverage reports
> -------------------------------------------------
>                 Key: HADOOP-15190
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15190
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: build
>            Reporter: Duo Xu
>            Assignee: Duo Xu
>            Priority: Minor
>         Attachments: HADOOP-15190.01.patch, jacoco_report_2018_01_25.JPG
> Currently Hadoop is using maven-clover2-plugin for code coverage, which is 
> outdated. And Atlassian open-sourced clover last year so license cannot be 
> purchased although we can switch to use the license-free version called 
> "openclover".
> This Jira is to replace clover with Jacoco, which is actively maintained by 
> the community.

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