Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2850
Nice!
There is one more place that we can cleanup: `hflush()` and `hsync()` on
`FsDataOutputStream` are implemented via reflection to make it work with Hadoop
1. We can remove that trick now.
See here:
https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/fs/hdfs/HadoopDataOutputStream.java#L143
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