org.apache.flink.runtime.jobmaster.slotpool

Class PreviousAllocationSchedulingStrategy

java.lang.Object

org.apache.flink.runtime.jobmaster.slotpool.LocationPreferenceSchedulingStrategy

org.apache.flink.runtime.jobmaster.slotpool.PreviousAllocationSchedulingStrategy

All Implemented Interfaces:

SchedulingStrategy

public class PreviousAllocationSchedulingStrategy
extends LocationPreferenceSchedulingStrategy

SchedulingStrategy which tries to match a slot with its previous AllocationID. If the previous allocation cannot be found, then it returns null. If the slot has not been scheduled before (no assigned allocation id), it will fall back to LocationPreferenceSchedulingStrategy.

Method Summary

Modifier and Type	Method and Description
<IN,OUT> OUT	findMatchWithLocality(SlotProfile slotProfile, java.util.function.Supplier<java.util.stream.Stream<IN>> candidates, java.util.function.Function<IN,SlotInfo> contextExtractor, java.util.function.Predicate<IN> additionalRequirementsFilter, java.util.function.BiFunction<IN,Locality,OUT> resultProducer) This method takes the candidate slots, extracts slot contexts from them, filters them by the profile requirements and potentially by additional requirements, and produces a result from a match.
static PreviousAllocationSchedulingStrategy	getInstance()

Methods inherited from class org.apache.flink.runtime.jobmaster.slotpool.LocationPreferenceSchedulingStrategy

doFindMatchWithLocality

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

findMatchWithLocality

@Nullable
public <IN,OUT> OUT findMatchWithLocality(@Nonnull
                                                    SlotProfile slotProfile,
                                                    @Nonnull
                                                    java.util.function.Supplier<java.util.stream.Stream<IN>> candidates,
                                                    @Nonnull
                                                    java.util.function.Function<IN,SlotInfo> contextExtractor,
                                                    @Nonnull
                                                    java.util.function.Predicate<IN> additionalRequirementsFilter,
                                                    @Nonnull
                                                    java.util.function.BiFunction<IN,Locality,OUT> resultProducer)

Description copied from interface: SchedulingStrategy

This method takes the candidate slots, extracts slot contexts from them, filters them by the profile requirements and potentially by additional requirements, and produces a result from a match.

Specified by:

findMatchWithLocality in interface SchedulingStrategy

Overrides:

findMatchWithLocality in class LocationPreferenceSchedulingStrategy

Type Parameters:

IN - type of the objects against we match the profile.

OUT - type of the produced output from a matching object.

Parameters:

slotProfile - slotProfile for which to find a matching slot

candidates - stream of candidates to match against.

contextExtractor - function to extract the SlotContext from the candidates.

additionalRequirementsFilter - predicate to specify additional requirements for each candidate.

resultProducer - function to produce a result from a matching candidate input.

Returns:

the result produced by resultProducer if a matching candidate was found or null otherwise.

getInstance

public static PreviousAllocationSchedulingStrategy getInstance()