Request tracing in Cassandra 1.2

Cassandra, a distributed database system, has moved beyond its original design and now supports more complex read operations. To help users understand what's happening under the hood, request tracing has been added to version 1.2. Tracing can be used to diagnose performance problems and optimize data models. For example, appropriate indexes are needed for efficient queries, and using Cassandra as a durable queue may require rethinking the data model due to its log-structured storage engine. Cassandra 1.2 Beta 2 is available for testing, with the final release expected before the end of the year.