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Audience: All Cassandra Users and Developers
User Impact: Improved LWT performance, particularly in WAN or contended scenarios

Released: 4.1

Motivation

  • LWTs suffer from poor performance, particularly in a WAN setting, and particularly under contention.
  • LWTs have never guaranteed linearizability across range movements, which is a significant problem for a mechanism intended to offer strong consistency.
  • CASSANDRA-12126 has introduced significant performance regressions in order to resolve long-standing correctness issues. This may result in users being unable to use LWTs where they could previously, or else having to accept a poorly-documented correctness trade-off in order to keep the lights on.

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