hadoop DevicePluginScheduler 源码
haddop DevicePluginScheduler 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/api/deviceplugin/DevicePluginScheduler.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.nodemanager.api.deviceplugin;
import java.util.Map;
import java.util.Set;
/**
* An optional interface to implement if custom device scheduling is needed.
* If this is not implemented, the device framework will do scheduling.
* */
public interface DevicePluginScheduler {
/**
* Called when allocating devices. The framework will do all device book
* keeping and fail recovery. So this hook could be stateless and only do
* scheduling based on available devices passed in. It could be
* invoked multiple times by the framework. The hint in environment variables
* passed in could be potentially used in making better scheduling decision.
* For instance, GPU scheduling might support different kind of policy. The
* container can set it through environment variables.
* @param availableDevices Devices allowed to be chosen from.
* @param count Number of device to be allocated.
* @param env Environment variables of the container.
* @return A set of {@link Device} allocated
* */
Set<Device> allocateDevices(Set<Device> availableDevices, int count,
Map<String, String> env);
}
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