hadoop WorkloadMapper 源码
haddop WorkloadMapper 代码
文件路径：/hadoop-tools/hadoop-dynamometer/hadoop-dynamometer-workload/src/main/java/org/apache/hadoop/tools/dynamometer/workloadgenerator/WorkloadMapper.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.tools.dynamometer.workloadgenerator;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
/**
* Represents the base class for a generic workload-generating mapper. By
* default, it will expect to use {@link VirtualInputFormat} as its
* {@link InputFormat}. Subclasses requiring a reducer or expecting a different
* {@link InputFormat} should override the {@link #configureJob(Job)} method.
*/
public abstract class WorkloadMapper<KEYIN, VALUEIN, KEYOUT, VALUEOUT> extends
Mapper<KEYIN, VALUEIN, KEYOUT, VALUEOUT> {
/**
* Get the description of the behavior of this mapper.
* @return description string.
*/
public abstract String getDescription();
/**
* Get a list of the description of each configuration that this mapper
* accepts.
* @return list of the description of each configuration.
*/
public abstract List<String> getConfigDescriptions();
/**
* Verify that the provided configuration contains all configurations required
* by this mapper.
* @param conf configuration.
* @return whether or not all configurations required are provided.
*/
public abstract boolean verifyConfigurations(Configuration conf);
/**
* Setup input and output formats and optional reducer.
*/
public void configureJob(Job job) {
job.setInputFormatClass(VirtualInputFormat.class);
job.setNumReduceTasks(0);
job.setOutputKeyClass(NullWritable.class);
job.setOutputValueClass(NullWritable.class);
job.setOutputFormatClass(NullOutputFormat.class);
}
}
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