Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/4293
to be honest, I think the cache was used in the second build of the PR as
indicated by these lines (of the first build profile):
```
attempting to download cache archive - 3.41s
fetching
PR.4293/cache-linux-trusty-cd051817889efc5ff66a50de5c44d5db4ca23a5b661872a975c2c953f95d8ab6--jdk-oraclejdk8.tgz
found cache - 0.00s
adding /home/travis/.m2 to cache - 16.77s
```
Also, there, the cleanup (`test ! -d $HOME/.m2/repository/ || find
$HOME/.m2/repository/ -name "*.jar" -exec sh -c 'if ! zip -T {} >/dev/null ;
then echo "deleting invalid file: {}"; rm {} ; fi' \;`) took another 36s.
Strangely, in the non-cache build, I do not see any `Downloading:
.../maven-metadata.xml` or pom or jar file messages... my guess is that this is
due to the parameter
`-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn`?
- should we disable it for testing that there are actually no new downloads
with the cache in place?
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