Github user dongjoon-hyun commented on the pull request:

    https://github.com/apache/spark/pull/11438#issuecomment-190473353
  
    Oh, thank you for informing that, @zsxwing . 
    
    By the way, `dev\lint-java` does not depend on `mvn install`. I think It 
depends on compiled classes.
    You can do that by the following. How do you think of that, @zsxwing ? Is 
there any way to re-enable that?
    ```
    $ ./build/sbt compile
    $ # Add "<module name="UnusedImports"/>" into checkstyle.xml.
    $ time ./dev/lint-java
    ...
    real        0m14.880s
    user        0m35.663s
    sys 0m1.741s
    ```


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