hadoop StageAllocator 源码
haddop StageAllocator 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/reservation/planning/StageAllocator.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.server.resourcemanager.reservation.planning;
import java.util.Map;
import org.apache.hadoop.yarn.api.records.ReservationId;
import org.apache.hadoop.yarn.api.records.ReservationRequest;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.server.resourcemanager.reservation.Plan;
import org.apache.hadoop.yarn.server.resourcemanager.reservation.RLESparseResourceAllocation;
import org.apache.hadoop.yarn.server.resourcemanager.reservation.ReservationInterval;
import org.apache.hadoop.yarn.server.resourcemanager.reservation.exceptions.PlanningException;
/**
* Interface for allocating a single stage in IterativePlanner.
*/
public interface StageAllocator {
/**
* Computes the allocation of a stage inside a defined time interval.
*
* @param plan the Plan to which the reservation must be fitted
* @param planLoads a 'dirty' read of the plan loads at each time
* @param planModifications the allocations performed by the planning
* algorithm which are not yet reflected by plan
* @param rr the stage
* @param stageArrival the arrival time (earliest starting time) set for
* the stage by the two phase planning algorithm
* @param stageDeadline the deadline of the stage set by the two phase
* planning algorithm
* @param period the periodicity with which this stage appears
* @param user name of the user
* @param oldId identifier of the old reservation
*
* @return The computed allocation (or null if the stage could not be
* allocated)
* @throws PlanningException if operation is unsuccessful
*/
Map<ReservationInterval, Resource> computeStageAllocation(Plan plan,
RLESparseResourceAllocation planLoads,
RLESparseResourceAllocation planModifications, ReservationRequest rr,
long stageArrival, long stageDeadline, long period, String user,
ReservationId oldId) throws PlanningException;
}
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