Read repair
On read, compare responses from replicas. If mismatch: send correct data to stale replica. Blocking or async based on CL.
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dclocal_read_repair_chance
Probability of repair on cache-hit reads. Default 0.1 (10%). Higher = more repair traffic. Lower = data divergence.
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Hinted handoff
Write with unavailable replica → coordinator stores hint. Replays when replica online. Default 3-hour window.