Github user srdo commented on the issue:
https://github.com/apache/storm/pull/2735
I saw failures in the metrics tests very often when adding Java 10 to the
testing matrix, e.g. https://travis-ci.org/srdo/storm/builds/395663084. Maybe
Travis runs the tests on the same machine, and the extra load happens to
trigger the failure? I've also been unable to trigger the error locally or on
master.---
