Dragonfly Avoids Redis Cluster's Cross-Key Penalty — Until You Scale Beyond One Node

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Redis Cluster rejects multi-key commands like MGET and Lua scripts when keys land on different hash slots, forcing developers to use hash-tags that concentrate data on one shard and undermine load distribution. Dragonfly, by contrast, handles cross-key operations natively on a single node by using all available CPU cores without sharding, preserving atomic multi-key semantics. Benchmarks show a single Dragonfly instance scaling MGET across 10 keys from 0.3 million to 2.4 million commands per second as cores increase from 4 to 48. However, the article cautions that Dragonfly Cluster, when deployed across multiple machines, uses the same 16,384-slot model as Redis and returns identical cross-slot errors. The practical advantage is that Dragonfly delays this architectural trade-off until a workload genuinely outgrows a single large machine, whereas Redis users face it as soon as multi-core scaling is needed.

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