org.apache.flink.runtime.shuffle.UnknownShuffleDescriptor Maven / Gradle / Ivy
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* 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,
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*/
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.util.Optional;
/**
* Unknown {@link ShuffleDescriptor} for which the producer has not been deployed yet.
*
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 which are this special implementation of {@link ShuffleDescriptor}.
*/
public final class UnknownShuffleDescriptor implements ShuffleDescriptor {
private static final long serialVersionUID = -4001330825983412431L;
private final ResultPartitionID resultPartitionID;
public UnknownShuffleDescriptor(ResultPartitionID resultPartitionID) {
this.resultPartitionID = resultPartitionID;
}
@Override
public ResultPartitionID getResultPartitionID() {
return resultPartitionID;
}
@Override
public boolean isUnknown() {
return true;
}
@Override
public Optional storesLocalResourcesOn() {
return Optional.empty();
}
}