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 https://www.youngju.dev/blog/culture/2026-05-16-modern-lua-luau-2026-lua-5-4-luajit-roblox-luau-neovim-lua-openresty-defold-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-modern-lua-luau-2026-lua-5-4-luajit-roblox-luau-neovim-lua-openresty-defold-deep-dive.en Lua is not dead in 2026 — it is more alive than ever, through Luau in Roblox, LazyVim in Neovim, and OpenResty in NGINX. Lua 5.4 generational GC and integer types, LuaJIT still untouchable in performance, Roblox Luau gradual typing and native codegen, the LazyVim and AstroNvim and NvChad and LunarVim explosion in Neovim configs, OpenResty NGINX embedding, Tarantool in-memory DB, Defold and Solar2D and Love2D indie game engines, MoonScript and Yuescript and Teal and Pluto and Fennel variants, and Hammerspoon and Wireshark and Adobe Lightroom embedded Lua — this is a one-shot tour of the 2026 Lua and Luau ecosystem. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) lualua-5-4luajitluaurobloxneovimlazyvimastronvimnvchadlunarvimopenrestynginx-luatarantooldefoldlove2dsolar2dcoronamoonscriptyuescripttealpluto-luafennelhammerspoonwireshark2026deep-diveenglish https://www.youngju.dev/blog/culture/2026-05-16-modern-lua-luau-2026-lua-5-4-luajit-roblox-luau-neovim-lua-openresty-defold-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-modern-lua-luau-2026-lua-5-4-luajit-roblox-luau-neovim-lua-openresty-defold-deep-dive.ja 2026年の今、Lua は死んでいない — むしろ Roblox の Luau、Neovim の LazyVim、NGINX の OpenResty を通じて、これまで以上に生きている。Lua 5.4 の世代別 GC と整数型、LuaJIT の依然として圧倒的なパフォーマンス、Roblox Luau のグラデュアル型付けとネイティブコード生成、LazyVim・AstroNvim・NvChad・LunarVim による Neovim 設定の爆発、OpenResty の NGINX 組み込み、Tarantool インメモリ DB、Defold・Solar2D・Love2D インディーゲームエンジン、MoonScript・Yuescript・Teal・Pluto・Fennel という変種言語、Hammerspoon・Wireshark・Adobe Lightroom の組み込み Lua まで — 2026年の Lua/Luau エコシステムを一気に整理する。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) lualua-5-4luajitluaurobloxneovimlazyvimastronvimnvchadlunarvimopenrestynginx-luatarantooldefoldlove2dsolar2dcoronamoonscriptyuescripttealpluto-luafennelhammerspoonwireshark2026deep-dive日本語 https://www.youngju.dev/blog/culture/2026-05-16-modern-lua-luau-2026-lua-5-4-luajit-roblox-luau-neovim-lua-openresty-defold-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-modern-lua-luau-2026-lua-5-4-luajit-roblox-luau-neovim-lua-openresty-defold-deep-dive 2026년 현재 Lua는 죽지 않았다 — 오히려 Luau를 통해 Roblox에서, LazyVim을 통해 Neovim에서, OpenResty를 통해 NGINX에서 어느 때보다 살아 있다. Lua 5.4의 통합 GC와 정수 타입, LuaJIT의 여전히 압도적인 성능, Roblox Luau의 점진적 타이핑과 native code generation, LazyVim·AstroNvim·NvChad·LunarVim이 만든 Neovim 설정의 폭발, OpenResty의 NGINX 임베디드 성능, Tarantool 인메모리 DB, Defold·Solar2D·Love2D 인디 게임 엔진, MoonScript·Yuescript·Teal·Pluto·Fennel 변형 언어, Hammerspoon·Wireshark·Adobe Lightroom의 임베디드 Lua까지 — 2026년 Lua/Luau 생태계를 한 번에 정리한다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) lualua-5-4luajitluaurobloxneovimlazyvimastronvimnvchadlunarvimopenrestynginx-luatarantooldefoldlove2dsolar2dcoronamoonscriptyuescripttealpluto-luafennelhammerspoonwireshark2026deep-dive