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When a replica is down, coordinator stores hints. Replays on recovery (up to 3h default).
What you're seeing
If a write targets a down replica, coordinator stores a hint (the write + target). When the replica comes back, hints replay automatically.
Default hint window: 3 hours. Past that, run repair to catch up. Hints reduce inconsistency window but don't replace repair.
★ KEY TAKEAWAY
When a replica is down, coordinator stores hints. Replays when replica returns. Reduces inconsistency window.
▶ WHAT TO TRY
- Kill N2, write a few — hints accumulate.
- Revive N2 and replay — N2 catches up.