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https://issues.apache.org/jira/browse/FLINK-2457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654056#comment-14654056
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ASF GitHub Bot commented on FLINK-2457:
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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.
> Integrate Tuple0
> ----------------
>
> Key: FLINK-2457
> URL: https://issues.apache.org/jira/browse/FLINK-2457
> Project: Flink
> Issue Type: Improvement
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Minor
>
> Tuple0 is not cleanly integrated:
> - missing serialization/deserialization support in runtime
> - Tuple.getTupleClass(int arity) cannot handle arity zero, ie, cannot create
> an instance of Tuple0
> Tuple0 is currently only used in Python API, but will be integrated into
> Storm compatibility, too.
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