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There are two modes of distributed deployment for CEP which are as follows,
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Distributed Cache Mode Deployment
WSO2 CEP with Siddhi uses Hazelcast to achieve distributed processing. To enable distributed processing all CEP servers has to be deployed in the same Local Area Network, this enables all the Hazelcast instances of CEP to identify each other using multicast and create an in-memory cluster for supporting distributed processing.
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Follow the sample Distributed Purchase Analyzer Sample and Fraud Analyzer step by step guide to better understand this functionality
Persistence Mode Deployment
Using persistence mode enables CEP Queries to span lifetimes much greater than server uptime. This is achieved by taking periodic snapshots and storing all state information & windows in a scalable persistence store. In CEP we use Apache Cassandra as the scalable persistence store in order to achieve high scalability and low latency when persisting data. In this mode if server crashes the same server or another CEP server with the same bucket connected to the same Cassandra Data Store can be restored from the last available snapshot.
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