hadoop StrictPreemptionContract 源码
haddop StrictPreemptionContract 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/StrictPreemptionContract.java
/**
* 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.hadoop.yarn.api.records;
import java.util.Set;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.util.Records;
/**
* Enumeration of particular allocations to be reclaimed. The platform will
* reclaim exactly these resources, so the <code>ApplicationMaster</code> (AM)
* may attempt to checkpoint work or adjust its execution plan to accommodate
* it. In contrast to {@link PreemptionContract}, the AM has no flexibility in
* selecting which resources to return to the cluster.
* @see PreemptionMessage
*/
@Public
@Evolving
public abstract class StrictPreemptionContract {
@Private
@Unstable
public static StrictPreemptionContract newInstance(Set<PreemptionContainer> containers) {
StrictPreemptionContract contract =
Records.newRecord(StrictPreemptionContract.class);
contract.setContainers(containers);
return contract;
}
/**
* Get the set of {@link PreemptionContainer} specifying containers owned by
* the <code>ApplicationMaster</code> that may be reclaimed by the
* <code>ResourceManager</code>.
* @return the set of {@link ContainerId} to be preempted.
*/
@Public
@Evolving
public abstract Set<PreemptionContainer> getContainers();
@Private
@Unstable
public abstract void setContainers(Set<PreemptionContainer> containers);
}
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