I want to synchronize data among a set of REST API servers(Spring Boot based API cluster) periodically. Any instance in the cluster should be able to broadcast new information to all others.
I don't want to use a DB here. I am trying to find a lightweight library that can be used inside the API for this purpose. Is it possible to use Atomoix/Hazelcast/ZooKeeper for this purpose? If so, it will be really helpful if someone can post a sample code - if possible.
My thanks in advance.
Hazelcast can be used for this use-case. Each of the REST instances will create an embedded Hazelcast member within its JVM. Hazelcast members then discover each other and form the cluster. Your REST apps will use the IMap or ReplicatedMap service - a distributed key-value store (IMap can store more data, ReplicatedMap is faster). Once you write a data to the IMap all other instances see it right away.
See the code sample here: https://docs.hazelcast.com/hazelcast/latest/getting-started/get-started-java.html#complete-code-samples
This feature and the Spring integration are open-source.