org.apache.flink.runtime.jobmaster.slotpool

Interface SchedulingStrategy

All Known Implementing Classes:

LocationPreferenceSchedulingStrategy, PreviousAllocationSchedulingStrategy

public interface SchedulingStrategy

Classes that implement this interface provide a method to match objects to somehow represent slot candidates against the SlotProfile that produced the matcher object. A matching candidate is transformed into a desired result. If the matcher does not find a matching candidate, it returns null.

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.

Method Detail

findMatchWithLocality

@Nullable
<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)

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.

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.