https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 16 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-16-in-memory-caching-key-value-stores-2026-redis-8-valkey-keydb-dragonfly-memcached-garnet-microsoft-speedb-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-in-memory-caching-key-value-stores-2026-redis-8-valkey-keydb-dragonfly-memcached-garnet-microsoft-speedb-deep-dive.en A snapshot of the great in-memory cache schism that Redis kicked off in March 2024 when it switched to RSALv2/SSPL — and where the dust has settled in May 2026. Redis 8 after the relicense, the Linux Foundation Valkey fork (AWS/GCP/Oracle/Snap-backed), Snap-acquired KeyDB, Roman Gershmans multi-threaded Dragonfly, the still-alive Memcached, Microsofts surprise .NET-based Garnet, JVM data grids (Apache Ignite, Hazelcast, Infinispan), Aerospike, Tarantool, AWS Elasticache vs MemoryDB vs Valkey, Rust newcomer Skytable, and RocksDB fork Speedb. Plus distributed cache patterns (cache-aside, read-through, write-through, write-back, write-around), hot key + cache stampede mitigations (singleflight, dogpile), in-process caches (lru-cache, cachetools, Caffeine), the Redis module diaspora (RedisJSON, RediSearch, RedisGraph sunset, RedisTimeSeries, RedisBloom), and real-world ops at Kakao, Toss, Mercari, and NTT — so you know what to pick. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) cachingkey-value-storeredisvalkeykeydbdragonflymemcachedapache-ignitehazelcastinfinispanaerospiketarantoolelasticachememorydbgarnet-microsoftskytablespeedbrocksdblru-cachecachetoolscaffeinecache-asideread-throughwrite-throughwrite-backhot-keycache-stampede2026deep-diveenglish https://www.youngju.dev/blog/culture/2026-05-16-in-memory-caching-key-value-stores-2026-redis-8-valkey-keydb-dragonfly-memcached-garnet-microsoft-speedb-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-in-memory-caching-key-value-stores-2026-redis-8-valkey-keydb-dragonfly-memcached-garnet-microsoft-speedb-deep-dive.ja 2024年3月の Redis ライセンス変更（RSALv2 / SSPL）が引き起こしたインメモリキャッシュ陣営の大分裂を、2026年5月時点で整理します。Redis 8 の最新動向、Linux Foundation が受け入れた Valkey、Snap が買収した KeyDB、Roman Gershman のマルチスレッド Dragonfly、いまも生きている Memcached、Microsoft が公開した .NET ベースの Garnet、Apache Ignite / Hazelcast / Infinispan といった JVM 陣営、Aerospike、Tarantool、AWS Elasticache vs MemoryDB vs Valkey、そして Skytable / Speedb などの次世代候補までまとめて。cache-aside / read-through / write-through / write-back / write-around の分散キャッシュパターン、ホットキー / キャッシュスタンピード対策（singleflight / dogpile）、node-cache / lru-cache / cachetools / Caffeine などのインプロセスキャッシュライブラリ、RedisJSON / RediSearch / RedisGraph (sunset) / RedisTimeSeries / RedisBloom のモジュール分裂、そしてカカオ / トス / メルカリ / NTT の実運用事例まで — 誰が何を選ぶべきかを一気に解説します。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) cachingkey-value-storeredisvalkeykeydbdragonflymemcachedapache-ignitehazelcastinfinispanaerospiketarantoolelasticachememorydbgarnet-microsoftskytablespeedbrocksdblru-cachecachetoolscaffeinecache-asideread-throughwrite-throughwrite-backhot-keycache-stampede2026deep-dive日本語 https://www.youngju.dev/blog/culture/2026-05-16-in-memory-caching-key-value-stores-2026-redis-8-valkey-keydb-dragonfly-memcached-garnet-microsoft-speedb-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-in-memory-caching-key-value-stores-2026-redis-8-valkey-keydb-dragonfly-memcached-garnet-microsoft-speedb-deep-dive 2024년 3월 Redis 의 RSALv2/SSPL 라이선스 변경이 일으킨 인메모리 캐시 진영의 대분열을 2026년 5월 기준으로 정리합니다. Redis 8 의 최신 변화, Linux Foundation 이 받아들인 Valkey, Snap 이 사들인 KeyDB, Roman Gershman 의 멀티 스레드 Dragonfly, 여전히 살아있는 Memcached, Microsoft 가 깜짝 공개한 .NET 기반 Garnet, Apache Ignite / Hazelcast / Infinispan 같은 JVM 진영, Aerospike, Tarantool, AWS Elasticache vs MemoryDB vs Valkey, Skytable / Speedb 같은 차세대 후보까지 한 번에. cache-aside / read-through / write-through / write-back / write-around 분산 캐시 패턴, hot key 와 cache stampede 의 singleflight / dogpile 회피, node-cache / lru-cache / cachetools / Caffeine 같은 프로세스 내 캐시 라이브러리, RedisJSON / RediSearch / RedisGraph (sunset) / RedisTimeSeries / RedisBloom 의 모듈 분열, 그리고 카카오 / 토스 / 메르카리 / NTT 의 실제 운영 사례까지 — 누가 무엇을 골라야 하는지 한 번에 정리합니다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) cachingkey-value-storeredisvalkeykeydbdragonflymemcachedapache-ignitehazelcastinfinispanaerospiketarantoolelasticachememorydbgarnet-microsoftskytablespeedbrocksdblru-cachecachetoolscaffeinecache-asideread-throughwrite-throughwrite-backhot-keycache-stampede2026deep-dive