Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3651#issuecomment-66533431
So, one problem I can think of is that the test log4j.properties has this:
log4j.appender.file.append=false
Meaning that the second test plugin will overwrite the log file generated
by the first one. (In this case, I think scalatest will always run last, so
you'll never see the log file for the surefire run.)
Two ways I see to fix it:
* set append to "true", and clean up that file before running the tests
* parameterize the log file name so that each test run writes to a
different file
Also, bonus point if you place the test log4j.properties in a shared
location and nuke all the duplicate ones in each module. :-) (Although that
might be trying to squeeze too much cleanup into this patch.)
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