Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/983#issuecomment-127693034
The empty file is exactly the problem.
What happens if you read that file with a TypeSerializerInpitFormat typed
for Tuple0? It will not return the same amount of Tuple0 objects as were
"written" to it. That's the problem with de/serializers that do not read/write
anything. This problem can occur anywhere in Flink's engine where data is
serialized.
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