org.apache.flink.runtime.shuffle.ShuffleDescriptor Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.shuffle;
import org.apache.flink.runtime.clusterframework.types.ResourceID;
import org.apache.flink.runtime.io.network.partition.ResultPartitionID;
import java.io.Serializable;
import java.util.Collection;
import java.util.Optional;
/**
* Interface for shuffle deployment descriptor of result partition resource.
*
* The descriptor is used for the deployment of the partition producer/consumer and their data exchange
*/
public interface ShuffleDescriptor extends Serializable {
ResultPartitionID getResultPartitionID();
/**
* Returns whether the partition is known and registered with the {@link ShuffleMaster} implementation.
*
*
When a partition consumer is being scheduled, it can happen
* that the producer of the partition (consumer input channel) has not been scheduled
* and its location and other relevant data is yet to be defined.
* To proceed with the consumer deployment, currently unknown input channels have to be
* marked with placeholders. The placeholder is a special implementation of the shuffle descriptor:
* {@link UnknownShuffleDescriptor}.
*
*
Note: this method is not supposed to be overridden in concrete shuffle implementation.
* The only class where it returns {@code true} is {@link UnknownShuffleDescriptor}.
*
* @return whether the partition producer has been ever deployed and
* the corresponding shuffle descriptor is obtained from the {@link ShuffleMaster} implementation.
*/
default boolean isUnknown() {
return false;
}
/**
* Returns the location of the producing task executor if the partition occupies local resources there.
*
*
Indicates that this partition occupies local resources in the producing task executor. Such partition requires
* that the task executor is running and being connected to be able to consume the produced data. This is mostly
* relevant for the batch jobs and blocking result partitions which can outlive the producer lifetime and
* be released externally.
* {@link ShuffleEnvironment#releasePartitionsLocally(Collection)} can be used to release such kind of partitions locally.
*
* @return the resource id of the producing task executor if the partition occupies local resources there
*/
Optional storesLocalResourcesOn();
}