Scheduler Center

Firefly's scheduling center is organized around configuration entities and runtime state.

JobDefinition -> JobGroupDefinition -> ExecutorDefinition -> ExecutorInstance

Configuration Data

Model	Description
ExecutorDefinition	Logical executor definition, such as billing-executor
ExecutorInstance	Online service instance with heartbeat and connection state
JobGroupDefinition	Job group bound to a default executor
JobDefinition	Job schedule, target, policy, and parameters

Runtime Data

Runtime data includes nextFireTime, executions, targets, outbox records, node heartbeats, and shard leases. Firefly separates configuration and runtime state so one table does not carry every meaning.

Hot Path

load active jobs from store
        ->
build local TimingIndex
        ->
tick reads local due batch
        ->
advance runtime cursor
        ->
write execution and outbox
        ->
dispatch to local handler or remote executor

Persistent storage is the source of truth, but the scheduler does not scan the database on every short tick.