/**
* 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.server.resourcemanager.scheduler;
import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
/**
* Interface for a scheduler that supports preemption/killing
*
*/
public interface PreemptableResourceScheduler extends ResourceScheduler {
/**
* If the scheduler support container reservations, this method is used to
* ask the scheduler to drop the reservation for the given container.
* @param container Reference to reserved container allocation.
*/
void dropContainerReservation(RMContainer container);
/**
* Ask the scheduler to obtain back the container from a specific application
* by issuing a preemption request
* @param aid the application from which we want to get a container back
* @param container the container we want back
*/
void preemptContainer(ApplicationAttemptId aid, RMContainer container);
/**
* Ask the scheduler to forcibly interrupt the container given as input
* @param container
*/
void killContainer(RMContainer container);
}