DataStax Community Edition 2.1.7 and 2.0.16 are available for download from Planet Cassandra! These are maintenance releases of the 2.0 and 2.1 branches, neither of which have any version-specific upgrade notes, but do read through the all the relevant NEWS entries if you are upgrading from an older release.
One question we get a lot from application integrators is “how to make it faster”. In languages such as C++ and Java, this is often a matter of using asynchronous request execution, and tuning IO threads to maximally utilize the platform (e.g.
The commit log implementation of Cassandra was ovehauled in 2.1, bringing multithreaded and memory-mapped writing and reducing the log overheads for dramatically improved throughput. In the next version we have improved upon this by adding compression and addressing some unexpected read traffic caused by the commit log.
Background: If you are using the LeveledCompactionStrategy there is an exciting feature coming in Apache Cassandra 2.2. For background information on how leveled compaction works please refer here and here.
The Java driver team is pleased to announce the release of version 2.2.0-rc1, which brings parity with Cassandra 2.2. Here’s what the new Cassandra features change for driver users:
New CQL data types
New metadata for user-defined functions