Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/4293
that's actually hard to know in advance - I had only 3 builds that went
under the limit by chance so I was able to use the cache henceforth in those
three which constantly were below the 49min. This PR's Travis build cannot even
use the cache yet although it is creating one.
I don't know whether we can simulate this by simply adding another commit
on top - by chance I did see something that needs change, so we will see ;)
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