scheduler

class PriorityScheduler extends Scheduler

Assign resource to application based on the priority of the application
case class Resource(slots: Int) extends Product with Serializable
case class ResourceAllocation(resource: Resource, worker: ActorRef, workerId: WorkerId) extends Product with Serializable
case class ResourceRequest(resource: Resource, workerId: WorkerId, priority: Priority = NORMAL, relaxation: Relaxation = ANY, executorNum: Int = 1) extends Product with Serializable
abstract class Scheduler extends Actor

Scheduler schedule resource for different applications.

object Priority extends Enumeration

Each streaming job can have a priority, the job with higher priority will get scheduled resource earlier than those with lower priority.
object Relaxation extends Enumeration

Relaxation.ONEWORKER means only resource (slot) from that worker will be accepted by the requestor application job.
object Resource extends Serializable
object Scheduler