Nico Kruber created FLINK-16729:
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Summary: Offer an out-of-the-box Set serializer
Key: FLINK-16729
URL: https://issues.apache.org/jira/browse/FLINK-16729
Project: Flink
Issue Type: New Feature
Components: API / Type Serialization System
Affects Versions: 1.10.0
Reporter: Nico Kruber
Currently, Set types are serialized by Kryo by default, since Flink does not
come with an own SetSerializer (only one for maps). While the MapSerializer can
be easily adapted to cover sets instead, I think, this should be available by
default to get the maximum performance out of Flink (kryo is slow!)
When this is added, however, we need to provide a migration path for old state
(or not use the new SetSerializer by default but offer to opt-in). This may
need further investigation as to whether it is possible to migrate from kryo
automatically and whether we can check potential changes to the encapsulated
entry class.
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