Jepsen: MongoDB 3.4.0-rc3
In April 2015, we discussed stale and dirty reads in MongoDB 2.6.7. However, writes appeared to be safe; update-only workloads with majority write concern were linearizable. This conclusion was not entirely correct. In this Jepsen analysis, we develop new tests which show the MongoDB v0 replication protocol is intrinsically unsafe, allowing the loss of majority-committed documents. In addition, we
Why MongoDB config servers must be one or three only?
Config Server Protocols MongoDB 3.0 and earlier only support a single type of config server deployment protocol which is referred to as the legacy SCCC (Sync Cluster Connection Configuration) as of MongoDB 3.2. An SCCC deployment has either 1 config server (development only) or 3 config servers (production). MongoDB 3.2 deprecates the SCCC protocol and supports a new deployment type: Config Server
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