Stephan Ewen created FLINK-16192:
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Summary: Remove "Legacy State" and Checkpoint Compatibility with
Flink 1.2
Key: FLINK-16192
URL: https://issues.apache.org/jira/browse/FLINK-16192
Project: Flink
Issue Type: Improvement
Components: Runtime / Checkpointing
Reporter: Stephan Ewen
Assignee: Stephan Ewen
Fix For: 1.11.0
Legacy state is state produced by the {{Checkpointed}} interface, back in the
days before Flink applications were re-scalable. The interface was deprecated
in Flink 1.2, support dropped in Flink 1.4.
Removing legacy state leads to a lot of nice cleanups and simplifications in
the code, especially in the checkpoint metadata handling. This was in fact the
motivation, extending checkpoints to include "operator coordinators".
Removing support for this is in theory independent of removing support for
Flink 1.2, but in practice all the testing savepoints for 1.2 compatibility use
still this state. Dropping "legacy state" means either some very involved
reworking of all the 1.2 compatibility tests and re-building the 1.2 snapshots,
or dropping compatibility with Flink 1.2.
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