Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/236#issuecomment-71436404
I will have to rework this now that the support for registering Types and
Serializers at Kryo was merged.
The POJO subclass with tagging is slower because we do additional checks
and lookups: Upon serialisation we perform a map lookup to check whether the
subclass is actually a registered class. When deserialising we have to fetch
the correct subclass serialiser from an array of subclass serialisers.
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