Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2269
This is caused by `setInputType()` not being called on
`SequenceFileWriter`. In the test, you can call `setInputType` on the
`BucketingSink` once with the input `TypeInformation` and a `new
ExecutionConfig()`. That should do the trick.
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