Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/2422
I've compared the build time of the pull request with a recent build on
master, and it seems that the impact on the build time is pretty big (right is
with findbugs):

On my local machine, the build time looks like this:
+findbugs: 15:47 min
-findbugs: 08:24 min
On travis, our builds would be again pretty close to the 2 hours limit with
this change.
Maybe we can move the findbugs plugin into a separate profile and run it in
a special build on travis?
I'll try that out and report back.
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