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Cassandra Releases: Two Minor Upgrades

Cassandra has pushed out two new minor releases, first of them, 0.7.1, featuring a couple of performance improvements and new features, and the second, 0.7.2, fixing a critical bug in the 0.7.1 release.

Cassandra 0.7.1 Performance Improvements

  • Disk writes and sequential scans avoid polluting page cache (requires JNA to be enabled)
  • Cassandra performs writes efficiently across datacenters by sending a single copy of the mutation and having the recipient forward that to other replicas in its datacenter.
  • Improved network buffering
  • Reduced lock contention on memtable flush
  • Optimized supercolumn deserialization
  • Zero-copy reads from mmapped sstable files
  • Explicitly set higher JVM new generation size
  • Reduced i/o contention during saving of caches

Cassandra 0.7.1 New Features

  • added flush_largest_memtables_at and reduce_cache_sizes_at options to cassandra.yaml as an escape valve for memory pressure
  • added option to specify -Dcassandra.join_ring=false on startup to allow “warm spare” nodes or performing JMX maintenance before joining the ring

The complete list of changes can be found here:

Original title and link: Cassandra Releases: Two Minor Upgrades (NoSQL databases © myNoSQL)