I was surprised to see that travis_script_integration.sh is taking over 25 minutes to run (https://travis-ci.org/apache/arrow/jobs/349493491). My only real guess about what's going on is that JVM startup time on these hosts is super slow.
I can think of some things we could do to make things better:
- Add debugging output so we can see what's slow
- Write a Java integration test handler that validates multiple files at once
- Generate a single set of binary files for each producer rather than regenerating them each time (so Java would only need to produce binary files once instead of 3 times like now)