/**
* 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;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.v2.MiniMRYarnCluster;
import org.apache.hadoop.util.JarFinder;
/**
* A MiniMRCluster factory. In MR2, it provides a wrapper MiniMRClientCluster
* interface around the MiniMRYarnCluster. While in MR1, it provides such
* wrapper around MiniMRCluster. This factory should be used in tests to provide
* an easy migration of tests across MR1 and MR2.
*/
public class MiniMRClientClusterFactory {
public static MiniMRClientCluster create(Class<?> caller, int noOfNMs,
Configuration conf) throws IOException {
if (conf == null) {
conf = new Configuration();
}
FileSystem fs = FileSystem.get(conf);
Path testRootDir = new Path("target", caller.getName() + "-tmpDir")
.makeQualified(fs);
Path appJar = new Path(testRootDir, "MRAppJar.jar");
// Copy MRAppJar and make it private.
Path appMasterJar = new Path(MiniMRYarnCluster.APPJAR);
fs.copyFromLocalFile(appMasterJar, appJar);
fs.setPermission(appJar, new FsPermission("744"));
Job job = Job.getInstance(conf);
job.addFileToClassPath(appJar);
String callerJar = JarFinder.getJar(caller);
job.setJar(callerJar);
MiniMRYarnCluster miniMRYarnCluster = new MiniMRYarnCluster(caller
.getName(), noOfNMs);
miniMRYarnCluster.init(job.getConfiguration());
miniMRYarnCluster.start();
return new MiniMRYarnClusterAdapter(miniMRYarnCluster);
}
}