Tzu-Li (Gordon) Tai created FLINK-9377:
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Summary: Remove writing serializers as part of the checkpoint meta
information
Key: FLINK-9377
URL: https://issues.apache.org/jira/browse/FLINK-9377
Project: Flink
Issue Type: Sub-task
Components: State Backends, Checkpointing
Reporter: Tzu-Li (Gordon) Tai
Assignee: Tzu-Li (Gordon) Tai
Fix For: 1.6.0
When writing meta information of a state in savepoints, we currently write both
the state serializer as well as the state serializer's configuration snapshot.
Writing both is actually redundant, as most of the time they have identical
information.
Moreover, the fact that we use Java serialization to write the serializer and
rely on it to be re-readable on the restore run, already poses problems for
serializers such as the {{AvroSerializer}} (see discussion in FLINK-9202).
The proposal here is to leave only the config snapshot as meta information, and
use that as the single source of truth of information about the schema of
serialized state.
The config snapshot should be treated as a factory (or provided to a factory)
to re-create serializers capable of reading old, serialized state.
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