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.
    ```



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