/categories/durability/Recent content in Durability on Momo Engineering Journal/images/og-image.png/images/og-image.pngHugoen-usWed, 07 Oct 2026 01:35:45 -0600/posts/021-r3-write-durability-quorum/Thu, 27 Aug 2026 19:24:05 +0000/posts/021-r3-write-durability-quorum/Ack only what survived: fsync/group-commit durability barrier, survivor quorum, and read-your-writes — the write-side of the P0 stack./posts/020-r2-degraded-read-self-heal/Thu, 27 Aug 2026 10:14:18 +0000/posts/020-r2-degraded-read-self-heal/When a local replica is corrupted or missing, degraded read fetches from healthy survivors transparently, while a background rebuild loop restores cluster redundancy./posts/019-r1-failure-domain-placement/Wed, 26 Aug 2026 23:52:57 +0000/posts/019-r1-failure-domain-placement/Replicas must not ride in the same rack: CRUSH weights become rack/zone/DC-aware so a single domain failure can’t lose the data.