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Posted to pr@cassandra.apache.org by "Klose6 (via GitHub)" <gi...@apache.org> on 2026/07/27 17:39:47 UTC

[PR] CASSSIDECAR-486: Prefer exact-range CDC checkpoint on load to avoid restart rewind [cassandra-sidecar]

Klose6 opened a new pull request, #372:
URL: https://github.com/apache/cassandra-sidecar/pull/372

   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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Re: [PR] CASSSIDECAR-486: Prefer exact-range CDC checkpoint on load to avoid restart rewind [cassandra-sidecar]

Posted by "Klose6 (via GitHub)" <gi...@apache.org>.
Klose6 commented on PR #372:
URL: https://github.com/apache/cassandra-sidecar/pull/372#issuecomment-5417996108

   could anyone take a look of this PR? thanks! cc: @yifan-c @bbotella @jberragan 


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Re: [PR] CASSSIDECAR-486: Prefer exact-range CDC checkpoint on load to avoid restart rewind [cassandra-sidecar]

Posted by "bbotella (via GitHub)" <gi...@apache.org>.
bbotella commented on PR #372:
URL: https://github.com/apache/cassandra-sidecar/pull/372#issuecomment-5662531351

   Mmmm, I have a doubt here. Let's say:
   
   1. Job runs on range R1=(s1,e1) for a while, checkpoint row1 advances normally.
   2. Topology change reassigns it to R2=(s2,e2) (overlaps R1, different boundaries). First write for R2 correctly falls back to the full overlap set (no exact match yet), inherits row1's progress via min-merge, and starts writing row2. Row2 keeps advancing past where row1 ever got.
   3. Another topology change reassigns the job back to R1's exact boundaries.
   4. On load, exactRangeMatch finds row1 — an exact boundary match — and per the fix's logic, that wins outright, discarding row2 entirely, even though row2 is overlapping and strictly newer/further along than row1.
   
   I know this event is rarer than the one this patch is addressing, but still possible, right? 


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Re: [PR] CASSSIDECAR-486: Prefer exact-range CDC checkpoint on load to avoid restart rewind [cassandra-sidecar]

Posted by "yifan-c (via GitHub)" <gi...@apache.org>.
yifan-c commented on PR #372:
URL: https://github.com/apache/cassandra-sidecar/pull/372#issuecomment-5434736323

   Requested review from @jyothsnakonisa 


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