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Cassandra: Understanding Hinted Handoff

Jonathan Ellis explains hinted handoff and its implications on consistency, availability, and performance:

A hinted write does not count towards ConsistencyLevel requirements of ONE, QUORUM, or ALL. If insufficient replica targets are alive to sastisfy a requested ConsistencyLevel, UnavailableException will be thrown with or without Hinted Handoff. (This is an important difference from Dynamo’s replication model; Cassandra does not default to sloppy quorum. But, see “Extreme write availability” below.)

Original title and link: Cassandra: Understanding Hinted Handoff (NoSQL databases © myNoSQL)