Github user vijikarthi commented on the issue:
https://github.com/apache/flink/pull/2275
The `RollingFileSink` error might be due to
<a>https://issues.apache.org/jira/browse/HDFS-9213</a>. The secure MiniDFS
cluster requires privileged ports to be used and we need to enable the java
process to grant access if it is not running as root.
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