ONE, TWO, THREE
Wait for N nodes. ONE fastest, most available. Risk stale reads if replication in progress.
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QUORUM
Majority (RF/2 + 1). RF=3 → 2 nodes. R + W = QUORUM + QUORUM > 3 → strong consistency single DC.
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LOCAL_QUORUM
QUORUM within local DC only. Multi-DC deployment default. Avoids cross-DC latency.