Thirteen parts, from an empty Maven project to a server that speaks RESP, persists to disk, and replicates to a second instance, plus a reference of every link they lean on. Java, no libraries.https://blog.subashsdhami.com.np/enhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/00-getting-started/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/00-getting-started/A Maven project that compiles, runs, and is committed to git.Sun, 14 Jun 2026 00:00:00 GMTjavamavensetuphttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/01-tcp-before-redis/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/01-tcp-before-redis/A server that listens on port 6379, accepts clients, and echoes back whatever they send.Sun, 21 Jun 2026 00:00:00 GMTjavasocketstcphttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/02-one-read-is-not-one-request/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/02-one-read-is-not-one-request/Framing that splits a byte stream into requests, then a server that handles many clients at once.Sun, 28 Jun 2026 00:00:00 GMTjavatcpconcurrencyhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/03-what-redis-cli-actually-sends/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/03-what-redis-cli-actually-sends/A RESP parser, a RESP writer, and the project's first tests.Sun, 05 Jul 2026 00:00:00 GMTjavarespprotocolhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/04-bytes-become-commands/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/04-bytes-become-commands/A command dispatcher, plus PING and ECHO.Sun, 12 Jul 2026 00:00:00 GMTjavaprotocoldispatchhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/05-a-database-and-time/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/05-a-database-and-time/The key-value store, SET, GET, and key expiry.Sun, 19 Jul 2026 00:00:00 GMTjavastorageexpiryhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/06-atomic-or-wrong/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/06-atomic-or-wrong/EXISTS, DEL, TYPE, KEYS, the INCR family, and lists.Sun, 26 Jul 2026 00:00:00 GMTjavaconcurrencyatomicityhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/07-waiting-and-pretending/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/07-waiting-and-pretending/BLPOP, MULTI with EXEC and DISCARD, and WATCH.Sun, 02 Aug 2026 00:00:00 GMTjavablockingtransactionshttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/08-the-server-speaks-first/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/08-the-server-speaks-first/Pub/sub, streams, and a blocking XREAD.Sun, 09 Aug 2026 00:00:00 GMTjavapubsubstreamshttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/09-four-more-types/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/09-four-more-types/Hashes, sets, sorted sets, and SCAN.Sun, 16 Aug 2026 00:00:00 GMTjavadata-structureshttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/10-the-commands-that-make-it-usable/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/10-the-commands-that-make-it-usable/CONFIG GET, INFO, DBSIZE, FLUSHALL, command line options, the TTL family, and the rest of the string API.Sun, 23 Aug 2026 00:00:00 GMTjavaintrospectionhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/11-surviving-a-restart/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/11-surviving-a-restart/An RDB reader and writer, plus SAVE and BGSAVE.Sun, 30 Aug 2026 00:00:00 GMTjavapersistencerdbhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/12-two-servers/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/12-two-servers/Replication. A second instance that follows the first.Sun, 06 Sep 2026 00:00:00 GMTjavareplicationhttps://blog.subashsdhami.com.np/series/build-redis-from-scratch/13-resources/https://blog.subashsdhami.com.np/series/build-redis-from-scratch/13-resources/Every link the series leans on, grouped by the part that uses it.Sun, 13 Sep 2026 00:00:00 GMTjavaprotocolresources