Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5371
The CI Server reports the following problem below. Apparently the
configurations cause warnings to be printed. Can you have a look at that?
```
Found non-empty .out files:
log4j:WARN No such property [maxBackupIndex] in
org.apache.log4j.DailyRollingFileAppender.
log4j:WARN No such property [maxFileSize] in
org.apache.log4j.DailyRollingFileAppender.
log4j:WARN No such property [maxBackupIndex] in
org.apache.log4j.DailyRollingFileAppender.
log4j:WARN No such property [maxFileSize] in
org.apache.log4j.DailyRollingFileAppender.
One or more tests FAILED.
```
---
