Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/624
I added a fix to actually clear out the correct directory of Maven
artifacts before caching. In a separate, experimental branch, there's an
attempt to cache the artifacts resulting from npm. See:
https://github.com/justinleet/metron/tree/caching and
https://travis-ci.org/justinleet/metron. This required a run without the
integration tests on in order to make it to the populating the cache
successfully, then reenabling them next commit.
At this point we do have intermittent successful builds on my Travis,
although I'm doubt it's consistent.
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