[jira] [Created] (FLINK-16192) Remove "Legacy State" and Checkpoint Compatibility with Flink 1.2

[Shang Yuanchun (Jira)]

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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