Netflix Cuts Cassandra Read Latency by Splitting Partitions

Netflix's engineering team published a method for handling wide partitions in Apache Cassandra. Dynamic partitioning splits wide partitions per TimeSeries ID, asynchronously and transparently, with no application changes. Detection runs on the read path via byte counting and a Kafka event. Bloom filters plus cached metadata route reads to smaller child partitions, cutting latency from seconds to milliseconds.