Java tutorial
/** * 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.metron.integration.components; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.hdfs.MiniDFSCluster; import org.apache.hadoop.yarn.conf.YarnConfiguration; import org.apache.metron.integration.InMemoryComponent; import java.io.IOException; public class MRComponent implements InMemoryComponent { private Configuration configuration; MiniDFSCluster cluster; private Path basePath; public MRComponent withBasePath(String path) { basePath = new Path(path); return this; } public Configuration getConfiguration() { return configuration; } public Path getBasePath() { return basePath; } @Override public void start() { configuration = new Configuration(); System.clearProperty(MiniDFSCluster.PROP_TEST_BUILD_DATA); configuration.set(YarnConfiguration.YARN_MINICLUSTER_FIXED_PORTS, "true"); if (basePath == null) { throw new RuntimeException("Unable to start cluster: You must specify the basepath"); } configuration.set(MiniDFSCluster.HDFS_MINIDFS_BASEDIR, basePath.toString()); try { cluster = new MiniDFSCluster.Builder(configuration).build(); } catch (IOException e) { throw new RuntimeException("Unable to start cluster", e); } } @Override public void stop() { cluster.shutdown(); } }