Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/624
Most recent commit, as @ottobackwards points out, merits some explanation.
Specifically it turns off the jacoco:prepare-agent from the Travis build
and allows us to just run the tests directly without it. We don't actually
produce the reports here, so it's pretty extraneous.
Locally this resulted in:
```
mvn -q -T 2C surefire:test@unit-tests 309.46s user 20.20s system 169% cpu
3:14.92 total
mvn -q -T 2C jacoco:prepare-agent surefire:test@unit-tests 555.20s user
25.93s system 254% cpu 3:47.90 total
```
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