Score - Architecture

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The fundamental architecture of the project consists of:

• Worker - the unit that actually executes the steps from the execution plan. Execution logic is optimized for high throughput and is horizontally scalable.
• Orchestrator - a queue-based work distribution mechanism. Highly available and horizontally scalable.
• Persistency for cluster management - allowing a cluster of orchestrator and worker nodes. Optional for simple single-node deployments.
• Compiler - compiles a given flow format into an execution plan that can be executed by the workers. The introduction of a new flow formatting language is achieved by hooking the right compiler. Currently, we have an SLANG OOTB compiler (score language).

Note that score deployment has two flavors:

• Simple flavor - consists of a single-node deployment of orchestrator and worker in the same runtime container. No external DB is required.
• Distributed flavor - a highly available and scalable deployment that requires an external DB schema and a servlet container for hosting the orchestrator node(s).