Java tutorial
package org.apache.helix.filestore; /* * 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. */ import java.io.File; import java.io.IOException; import java.util.Arrays; import java.util.HashMap; import java.util.Map; import org.I0Itec.zkclient.IDefaultNameSpace; import org.I0Itec.zkclient.ZkClient; import org.I0Itec.zkclient.ZkServer; import org.apache.commons.io.FileUtils; import org.apache.helix.HelixDataAccessor; import org.apache.helix.HelixManager; import org.apache.helix.PropertyKey.Builder; import org.apache.helix.controller.HelixControllerMain; import org.apache.helix.model.HelixConfigScope; import org.apache.helix.model.HelixConfigScope.ConfigScopeProperty; import org.apache.helix.model.builder.HelixConfigScopeBuilder; import org.apache.helix.tools.ClusterSetup; public class IntegrationTest { public static void main(String[] args) throws InterruptedException { ZkServer server = null; ; try { String baseDir = "/tmp/IntegrationTest/"; final String dataDir = baseDir + "zk/dataDir"; final String logDir = baseDir + "/tmp/logDir"; FileUtils.deleteDirectory(new File(dataDir)); FileUtils.deleteDirectory(new File(logDir)); IDefaultNameSpace defaultNameSpace = new IDefaultNameSpace() { @Override public void createDefaultNameSpace(ZkClient zkClient) { } }; int zkPort = 2199; final String zkAddress = "localhost:" + zkPort; server = new ZkServer(dataDir, logDir, defaultNameSpace, zkPort); server.start(); ClusterSetup setup = new ClusterSetup(zkAddress); final String clusterName = "file-store-test"; setup.deleteCluster(clusterName); setup.addCluster(clusterName, true); setup.addInstanceToCluster(clusterName, "localhost_12001"); setup.addInstanceToCluster(clusterName, "localhost_12002"); setup.addInstanceToCluster(clusterName, "localhost_12003"); setup.addResourceToCluster(clusterName, "repository", 1, "MasterSlave"); setup.rebalanceResource(clusterName, "repository", 3); // Set the configuration final String instanceName1 = "localhost_12001"; addConfiguration(setup, baseDir, clusterName, instanceName1); final String instanceName2 = "localhost_12002"; addConfiguration(setup, baseDir, clusterName, instanceName2); final String instanceName3 = "localhost_12003"; addConfiguration(setup, baseDir, clusterName, instanceName3); Thread thread1 = new Thread(new Runnable() { @Override public void run() { FileStore fileStore = null; try { fileStore = new FileStore(zkAddress, clusterName, instanceName1); fileStore.connect(); } catch (Exception e) { System.err.println("Exception" + e); fileStore.disconnect(); } } }); // START NODES Thread thread2 = new Thread(new Runnable() { @Override public void run() { FileStore fileStore = new FileStore(zkAddress, clusterName, instanceName2); fileStore.connect(); } }); // START NODES Thread thread3 = new Thread(new Runnable() { @Override public void run() { FileStore fileStore = new FileStore(zkAddress, clusterName, instanceName3); fileStore.connect(); } }); System.out.println("STARTING NODES"); thread1.start(); thread2.start(); thread3.start(); // Start Controller final HelixManager manager = HelixControllerMain.startHelixController(zkAddress, clusterName, "controller", HelixControllerMain.STANDALONE); Thread.sleep(5000); printStatus(manager); listFiles(baseDir); System.out.println("Writing files a.txt and b.txt to current master " + baseDir + "localhost_12001" + "/filestore"); FileUtils.writeStringToFile(new File(baseDir + "localhost_12001" + "/filestore/a.txt"), "some_data in a"); FileUtils.writeStringToFile(new File(baseDir + "localhost_12001" + "/filestore/b.txt"), "some_data in b"); Thread.sleep(10000); listFiles(baseDir); Thread.sleep(5000); System.out.println("Stopping the MASTER node:" + "localhost_12001"); thread1.interrupt(); Thread.sleep(10000); printStatus(manager); System.out.println("Writing files c.txt and d.txt to current master " + baseDir + "localhost_12002" + "/filestore"); FileUtils.writeStringToFile(new File(baseDir + "localhost_12002" + "/filestore/c.txt"), "some_data in c"); FileUtils.writeStringToFile(new File(baseDir + "localhost_12002" + "/filestore/d.txt"), "some_data in d"); Thread.sleep(10000); listFiles(baseDir); System.out.println("Create or modify any files under " + baseDir + "localhost_12002" + "/filestore" + " and it should get replicated to " + baseDir + "localhost_12003" + "/filestore"); } catch (Exception e) { e.printStackTrace(); } finally { if (server != null) { // server.shutdown(); } } Thread.currentThread().join(); } private static void listFiles(String baseDir) { System.out.println("===============FILES==============================="); String[] instances = new String[] { "localhost_12001", "localhost_12002", "localhost_12003" }; for (String instance : instances) { String dir = baseDir + instance + "/filestore"; String[] list = new File(dir).list(); System.out.println(dir + ":" + ((list != null) ? Arrays.toString(list) : "NONE")); } System.out.println("===============FILES==============================="); } private static void printStatus(final HelixManager manager) { System.out.println("CLUSTER STATUS"); HelixDataAccessor helixDataAccessor = manager.getHelixDataAccessor(); Builder keyBuilder = helixDataAccessor.keyBuilder(); System.out .println("External View \n" + helixDataAccessor.getProperty(keyBuilder.externalView("repository"))); } private static void addConfiguration(ClusterSetup setup, String baseDir, String clusterName, String instanceName) throws IOException { Map<String, String> properties = new HashMap<String, String>(); HelixConfigScopeBuilder builder = new HelixConfigScopeBuilder(ConfigScopeProperty.PARTICIPANT); HelixConfigScope instanceScope = builder.forCluster(clusterName).forParticipant(instanceName).build(); properties.put("change_log_dir", baseDir + instanceName + "/translog"); properties.put("file_store_dir", baseDir + instanceName + "/filestore"); properties.put("check_point_dir", baseDir + instanceName + "/checkpoint"); setup.getClusterManagementTool().setConfig(instanceScope, properties); FileUtils.deleteDirectory(new File(properties.get("change_log_dir"))); FileUtils.deleteDirectory(new File(properties.get("file_store_dir"))); FileUtils.deleteDirectory(new File(properties.get("check_point_dir"))); new File(properties.get("change_log_dir")).mkdirs(); new File(properties.get("file_store_dir")).mkdirs(); new File(properties.get("check_point_dir")).mkdirs(); } }