Github user shijinkui commented on the issue:
https://github.com/apache/flink/pull/3190
" /tmp/cacheFile (Permission denied)" exception of unit test can be replay.
1. on linux env, `sudo - userA`, clone the flink code, start to `mvn clean
test verify`
2. on the linux machine, `sudo - userB`, clone the flink codebase, same
start to `mvn clean test verify`
Because two use share the same `/tmp` directory which have no random sub
directory.
IMO, `/tmp` change to `${project.build.directory}`, at same time have
random suffix. This can resolve the problem thoroughly.
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