org.apache.flink.runtime.scheduler.adaptive.allocator

接口 SlotAllocator

所有已知实现类:

SlotSharingSlotAllocator

public interface SlotAllocator

Component for calculating the slot requirements and mapping of vertices to slots.

方法概要

限定符和类型	方法和说明
ResourceCounter	calculateRequiredSlots(Iterable<JobInformation.VertexInformation> vertices) Calculates the total resources required for scheduling the given vertices.
Optional<? extends VertexParallelism>	determineParallelism(JobInformation jobInformation, Collection<? extends SlotInfo> slots) Determines the parallelism at which the vertices could be scheduled given the collection of slots.
Optional<ReservedSlots>	tryReserveResources(VertexParallelism vertexParallelism) Reserves slots according to the given assignment if possible.

方法详细资料

calculateRequiredSlots

ResourceCounter calculateRequiredSlots(Iterable<JobInformation.VertexInformation> vertices)

Calculates the total resources required for scheduling the given vertices.

参数:

vertices - vertices to schedule

返回:

required resources

determineParallelism

Optional<? extends VertexParallelism> determineParallelism(JobInformation jobInformation,
                                                           Collection<? extends SlotInfo> slots)

Determines the parallelism at which the vertices could be scheduled given the collection of slots. This method may be called with any number of slots providing any amount of resources, irrespective of what calculateRequiredSlots(Iterable) returned.

If a VertexParallelism is returned then it covers all vertices contained in the given job information.

Implementations of this method must be side-effect free. There is no guarantee that the result of this method is ever passed to tryReserveResources(VertexParallelism).

参数:

jobInformation - information about the job graph

slots - slots to consider for determining the parallelism

返回:

potential parallelism for all vertices and implementation-specific information for how the vertices could be assigned to slots, if all vertices could be run with the given slots

tryReserveResources

Optional<ReservedSlots> tryReserveResources(VertexParallelism vertexParallelism)

Reserves slots according to the given assignment if possible. If the underlying set of resources has changed and the reservation with respect to vertexParallelism is no longer possible, then this method returns Optional.empty().

参数:

vertexParallelism - information on how slots should be assigned to the slots

返回:

Set of reserved slots if the reservation was successful; otherwise Optional.empty()