With the help of the Cassandra community, we recently released PBS
consistency predictions as a feature in the official Cassandra 1.2.0
stable release. In case you aren’t familiar, PBS (Probabilistically
Bounded Staleness) predictions help answer questions like: how
eventual is eventual consistency? how consistent is eventual
consistency? These predictions help you profile your existing
Cassandra cluster and determine which configuration of N,R, and W
are the best fit for your application, expressed quantitatively in
terms of latency, consistency, and durability (see output below).
If I get this right, this tool should become a must-run-before-going-into-production and then also a good start for investigating WTFs like what am I suppose to do to avoid getting stale data.
Original title and link: Using Probabilistically Bounded Staleness in Cassandra 1.2.0 ( ©myNoSQL)