After extending Akka to connect multiple Akka clusters in Akka 23.05 easily, we took on the quest to stretch it out even further and take Akka to the edge of the cloud.

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This article explores the challenges and solutions for event-driven communication between edge and cloud using Akka Projections and brokerless service-to-service communication. It discusses the use of monotonically increasing sequence numbers for event tracking, remote projections over gRPC, handling disconnection and historical events, using H2 database as an event journal and offset store, and optimizing database access with a firehose query.

Deep-dive of Event-Driven communication between Edge and Cloud