| /** |
| * 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.mapred.gridmix.emulators.resourceusage; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapred.gridmix.Progressive; |
| import org.apache.hadoop.mapreduce.util.ResourceCalculatorPlugin; |
| import org.apache.hadoop.tools.rumen.ResourceUsageMetrics; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * <p>This is the driver class for managing all the resource usage emulators. |
| * {@link ResourceUsageMatcher} expects a comma separated list of |
| * {@link ResourceUsageEmulatorPlugin} implementations specified using |
| * {@link #RESOURCE_USAGE_EMULATION_PLUGINS} as the configuration parameter.</p> |
| * |
| * <p>Note that the order in which the emulators are invoked is same as the |
| * order in which they are configured. |
| */ |
| public class ResourceUsageMatcher { |
| /** |
| * Configuration key to set resource usage emulators. |
| */ |
| public static final String RESOURCE_USAGE_EMULATION_PLUGINS = |
| "gridmix.emulators.resource-usage.plugins"; |
| |
| private List<ResourceUsageEmulatorPlugin> emulationPlugins = |
| new ArrayList<ResourceUsageEmulatorPlugin>(); |
| |
| /** |
| * Configure the {@link ResourceUsageMatcher} to load the configured plugins |
| * and initialize them. |
| */ |
| @SuppressWarnings("unchecked") |
| public void configure(Configuration conf, ResourceCalculatorPlugin monitor, |
| ResourceUsageMetrics metrics, Progressive progress) { |
| Class[] plugins = |
| conf.getClasses(RESOURCE_USAGE_EMULATION_PLUGINS, |
| ResourceUsageEmulatorPlugin.class); |
| if (plugins == null) { |
| System.out.println("No resource usage emulator plugins configured."); |
| } else { |
| for (Class<? extends ResourceUsageEmulatorPlugin> plugin : plugins) { |
| if (plugin != null) { |
| emulationPlugins.add(ReflectionUtils.newInstance(plugin, conf)); |
| } |
| } |
| } |
| |
| // initialize the emulators once all the configured emulator plugins are |
| // loaded |
| for (ResourceUsageEmulatorPlugin emulator : emulationPlugins) { |
| emulator.initialize(conf, metrics, monitor, progress); |
| } |
| } |
| |
| public void matchResourceUsage() throws Exception { |
| for (ResourceUsageEmulatorPlugin emulator : emulationPlugins) { |
| // match the resource usage |
| emulator.emulate(); |
| } |
| } |
| } |