hadoop ResourceScheduler 源码
haddop ResourceScheduler 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/scheduler/ResourceScheduler.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.scheduler;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.SchedulingRequest;
import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
import org.apache.hadoop.yarn.server.resourcemanager.recovery.Recoverable;
/**
* This interface is the one implemented by the schedulers. It mainly extends
* {@link YarnScheduler}.
*
*/
@LimitedPrivate("yarn")
@Evolving
public interface ResourceScheduler extends YarnScheduler, Recoverable {
/**
* Set RMContext for <code>ResourceScheduler</code>.
* This method should be called immediately after instantiating
* a scheduler once.
* @param rmContext created by ResourceManager
*/
void setRMContext(RMContext rmContext);
/**
* Re-initialize the <code>ResourceScheduler</code>.
* @param conf configuration
* @throws IOException
*/
void reinitialize(Configuration conf, RMContext rmContext) throws IOException;
/**
* Get the {@link NodeId} available in the cluster by resource name.
* @param resourceName resource name
* @return the number of available {@link NodeId} by resource name.
*/
List<NodeId> getNodeIds(String resourceName);
/**
* Attempts to allocate a SchedulerRequest on a Node.
* NOTE: This ignores the numAllocations in the resource sizing and tries
* to allocate a SINGLE container only.
* @param appAttempt ApplicationAttempt.
* @param schedulingRequest SchedulingRequest.
* @param schedulerNode SchedulerNode.
* @return true if proposal was accepted.
*/
boolean attemptAllocationOnNode(SchedulerApplicationAttempt appAttempt,
SchedulingRequest schedulingRequest, SchedulerNode schedulerNode);
/**
* Reset scheduler metrics.
*/
void resetSchedulerMetrics();
}
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