Tzu-Li (Gordon) Tai created FLINK-17520:
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Summary: Extend CompositeTypeSerializerSnapshot to allow composite
serializers to signal migration based on outer configuration
Key: FLINK-17520
URL: https://issues.apache.org/jira/browse/FLINK-17520
Project: Flink
Issue Type: Improvement
Components: API / Type Serialization System
Reporter: Tzu-Li (Gordon) Tai
Assignee: Tzu-Li (Gordon) Tai
Compatibility of composite serializers is governed by the overall resolved
compatibility of all its nested serializers, as well as any additional
configuration (or what we call the "outer configuration" or "outer snapshot").
The compatibility resolution logic for these composite serializers is
implemented in the {{CompositeTypeSerializerSnapshot}} abstract class.
One current limitation of this base class is that the implementation assumes
that the outer configuration is always either compatible, or incompatible.
We should relax this to also allow signaling migration, purely based on the
outer configuration. This is already a requirement by FLINK-16998.
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