Nico Kruber created FLINK-9797:
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Summary: Separate state serializers from network serializers
Key: FLINK-9797
URL: https://issues.apache.org/jira/browse/FLINK-9797
Project: Flink
Issue Type: Improvement
Components: Type Serialization System
Reporter: Nico Kruber
State serializers need to maintain backwards compatibility and therefore the
format cannot be changed that easily and this is honoured by the classes around
{{TypeInformation}}. However, currently the same {{TypeInformation}} is being
used in the network stack where data is serialized between two operators during
shuffles and so. There, however, we do not need backwards compatibility and
could easily change the format and have more performant code, e.g. use custom
serializers for Java collections (not going through Kryo), etc.
I propose to separate these two (this is probably a bigger task since it is
quite invasive).
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