New Features in the DataStax Node.js Drivers

Version 1.4.0 of DataStax Enterprise Node.js Driver and version 3.3.0 of DataStax Node.js Driver for Apache Cassandra have been released, focusing on adding support for speculative query executions. The performance of Murmur3 hashing was improved, and the logic for query preparation was changed along with other enhancements. Speculative execution is a technique to limit latency at high percentiles by preemptively starting additional query executions against different nodes. It can be controlled via an instance of SpeculativeExecutionPolicy provided when initializing the Client. The driver also determines whether queries are idempotent, which affects how speculative executions are handled. Additionally, the new versions provide a method to obtain a snapshot of the pool state per host and more detailed information about all features, improvements, and fixes included in this release can be found in the changelogs.