Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3190
Many tests assume that the `tmp` directory exists.
I would actually prefer to fix the tests, rather than re-assignign the temp
directory. All tests should use a random subdirectory in the temp directory. It
is quite convenient to do via JUnit:
```java
@Rule
public final TemporaryFolder tmp = new TemporaryFolder();
```
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