Abstracted helper classes providing consistent key-value store functionality, with zookeeper and etcd3 implementations.
KVTable- A consistent key-value cache which is automatically kept in sync with a centralized KV store such as etcd or zookeeper.DynamicConfig- Simple read-only string config map automatically kept in sync with a shared table of configuration which allows listeners to react to config changes.SharedCounter- A basic distributed atomic counter.LeaderElection- Leader election, with an observer mode and ability to listen for leadership changes.Distributor- Rendezvous hashing implementation for group of members, which implementsIntPredicate.SessionNode- A singleton value whose existence is linked to the kv store client's session.
It is recommended to instantiate any/all of these classes via a KVUtilsFactory.
Though not reflected in the commit history of this repository, this library was originally developed and used internally by IBM in early 2017, with most development done in 2017-2018. A decision was made to contribute it to open source in 2021.