Jepsen: MongoDB stale reads

Please note: our followup analysis of 3.4.0-rc3 revealed additional faults in MongoDB’s replication algorithms which could lead to the loss of acknowledged documents–even with Majority Write Concern, journaling, and fsynced writes. In May of 2013, we showed that MongoDB 2.4.3 would lose acknowledged writes at all consistency levels. Every write concern less than MAJORITY loses data by design due t

[kuenishi]

圧巻のKnossosとNemesis

[kazuhooku]

どんな形でネットワーク分断が発生してもマスタに昇格する側でMajority取れないと一貫性保証できないから、Writeは50%じゃなく75%超えないといけないってことなのかしら