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Qdrant 1.19.1 reworks 4-bit TurboQuant SIMD and makes replica-state and transfer operations crash safe
The 2026-09-04 patch batches the 4-bit TurboQuant SIMD implementation across six PRs (#10391, #10392, #10362, #10437, #10439, #10381), adds prefetching to saturate memory bandwidth in quantized scoring (#10342, #10420), and batches HNSW searches (#10054, #10010, #10194). On the durability side, set-replica-state, abort transfer/resharding (#9760) and restart-transfer (#9786) are now crash safe to prevent consensus desync, and raw payloads in shard transfer make payload-heavy transfers 1.5x faster (#10040, #10066).
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