[flink] Optimize failover recovery for idempotent aggregations#3706
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[flink] Optimize failover recovery for idempotent aggregations#3706platinumhamburg wants to merge 2 commits into
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Expose duplicate-application idempotence as aggregation metadata. Verify every aggregation implementation with a parameterized real-merger contract.
Use no-op recovery when all effective aggregation operations are idempotent, and retain undo recovery otherwise. Preserve operator topology and checkpoint compatibility, clean stale recovery metadata, and cover SQL and DataStream failover paths.
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Purpose
Linked issue: close #3703
Brief change log
Tests
API and Format
Documentation