Github user juergenthomann commented on the issue:
https://github.com/apache/flink/pull/3807
It seems that DFSOutputStream is considered a private class (see
Annotation). HdfsDataOutputStream also provides an hsync with flags and is
considered public. It is also the place where the SyncFlags are provided.
I will try it with my mentioned small change and see if that solves our
problem.
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