Hacker News Reader

In a replica set configuration, all reads and writes are routed to the master by default. In this scenario, consistency is guaranteed. (You can optionally mark reads as "slaveOk", but then you admit inconsistency.)

This does sacrifice availability (in the CAP sense), but I haven't heard anyone claim otherwise.

View on HN

"In a replica set configuration, all reads and writes are routed to the master by default. In this scenario, consistency is guaranteed."

One would hope that reading and writing a single node database was consistent. This is table stakes for something calling itself a persistent store. Claiming partition tolerance in the above is the same as claiming availability. The former claim has been made. Rest left as exercise for the reader.

Namasté.

- Lil' B

If a slave is partitioned from its master, it won't be able to serve requests. (Unless the request is a read query marked as "slaveOk", in which case you admit inconsistency.) I highly doubt anyone would claim otherwise.

Reply on news.ycombinator.com