Yafeng Lu created CASSSIDECAR-486:
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Summary: Prefer exact-range CDC checkpoint on load to avoid
restart rewind
Key: CASSSIDECAR-486
URL: https://issues.apache.org/jira/browse/CASSSIDECAR-486
Project: Sidecar for Apache Cassandra
Issue Type: Improvement
Reporter: Yafeng Lu
On sidecar restart, CDC consumers reload checkpoint state from
sidecar_internal.cdc_state_v2. Today loadStateForRange returns all rows whose
(start, end) overlaps the owned range, then analytics merges them with
Marker.min (earliest segment/offset wins), which can rewind the offset to days
ago. However when an exact match exists, we can ignore stale overlapping
historical rows in cdc_state_v2, and fall back to the existing overlap-based
load (needed for cluster shrink) when no exact match is found.
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