Remove WorkerGroup abstraction from scheduler#594
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Replace WorkerGroupID with direct WorkerID tracking throughout the scheduler. Workers now carry worker_manager_id in heartbeats. The scheduler sees individual workers; only the ECS adapter maintains an internal translation layer (worker groups → ECS task ARNs). Key changes: - Protocol: WorkerManagerHeartbeat uses max_workers instead of max_worker_groups/workers_per_group. Commands renamed to StartWorkers/ShutdownWorkers with worker_ids list. - Scaling policies: operate on managed_worker_ids (List[WorkerID]) and managed_worker_capabilities (Dict[str, int]) instead of WorkerGroupState/WorkerGroupCapabilities. - WorkerManagerController: tracks workers per manager source via _manager_worker_ids (Dict[bytes, Set[WorkerID]]). - WorkerController: tracks worker→manager mapping from heartbeats. - Adapters: native/symphony flattened to Dict[WorkerID, Worker]. ECS keeps internal group→task_arn mapping invisible to scheduler. - Removed: WorkerGroupID, WorkerGroupInfo, WorkerGroupState, WorkerGroupCapabilities types. Signed-off-by: gxu <georgexu420@163.com>
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Replace WorkerGroupID with direct WorkerID tracking throughout the scheduler. Workers now carry worker_manager_id in heartbeats. The scheduler sees individual workers; only the ECS adapter maintains an internal translation layer.
Key changes: