[bytecodes]

Kafka does this as part of its design. A topic has a declared number of partitions (which can't really be changed on the fly, you choose a theoretical high number and hope it's enough), and an agreed upon hash algorithm chooses between those partitions (probably in Java, so hashCode is readily available for primitives as well as objects). Each partition is really like its own topic, so you lose in-order messaging for anything not included in your partition key.