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Chris Lu
bfea01e113
drainShardEvents only exits via ctx cancellation for an idle subscription — that's the steady-state when all replayed events are already past. Saving the cursor with the canceled passCtx silently drops every advance, so the next pass re-subscribes from the same floor and re-replays the same events. Symptom in s3tests: status=error shards=16 errors=16 on every pass, and 1/6 expire3/* dispatches lost to a race between concurrent shard drains all retrying the same events. Use a 5s timeout derived from context.Background for the save, and treat passCtx Deadline/Canceled from drain as a clean end-of-pass — not a shard-level error to log.