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Continue ZoneManager.service_states[] locking question on this same thread.

ZoneManager.update_service_capabilities() is updating service_states per compute_node periodic_tasks, where JsonFilter.filter_hosts() is also looping through service_states[] to filter each hosts. There is no data locking while accessing service_states[] from both controls, is it implicitly serialized through AMQP by nova-scheduler executing zoneManger and filter_hosts. Am I read it correct?!

nova-scheduler also schedules periodically through greenthread. If we derive ping() from SchedulerManager() to update service_states[] periodically on the same scheduler node, any data locking needed or what will be the better locking method?

Thanks, -Fred