Github user bodewig commented on the issue:
https://github.com/apache/commons-compress/pull/45
Your change is for the IT profile tests which aren't run on a regular
basis. Each of these surefire instances will run the tests of a single class
only. There won't be any difference between running them parallel "per class"
or not in parallel at all.
As these tests are resource hogs - file system and memory in particular -
they wouldn't be good candidates for running in parallel anyway.
For "normal" tests we inherit the settings from [Commons
Parent](https://svn.apache.org/repos/asf/commons/proper/commons-parent/trunk/),
TBH I don't know whether jacoco would be compatible with a parallel
execution of tests.
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