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https://issues.apache.org/jira/browse/CASSSIDECAR-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099527#comment-18099527
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Yafeng Lu commented on CASSSIDECAR-486:
---------------------------------------
cc: [
|https://github.com/apache/cassandra-sidecar/commits?author=jyothsnakonisa]
[~Jyothsnakonisa] [~jberragan] [~ycai] [~bernardo.botella] [
|https://github.com/apache/cassandra-sidecar/commits?author=jyothsnakonisa]
> 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
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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