| /** |
| * 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.ambari.server.serveraction.upgrades; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.ambari.server.Role; |
| import org.apache.ambari.server.state.Cluster; |
| import org.apache.ambari.server.state.Config; |
| import org.apache.ambari.server.state.Service; |
| import org.apache.ambari.server.state.ServiceComponentHost; |
| import org.apache.commons.lang.StringUtils; |
| |
| /** |
| * The {@link ZooKeeperQuorumCalculator} is a central location which can be used |
| * to construct a comma-separated string of known ZooKeeper hosts. The returned |
| * string constains FQDN of each known ZK host along with a port value for each. |
| */ |
| public class ZooKeeperQuorumCalculator { |
| private static final String ZOO_CFG_CONFIG_TYPE = "zoo.cfg"; |
| private static final String ZOOKEEPER_CLIENT_PORT_PROPERTY_NAME = "clientPort"; |
| private static final String DEFAULT_ZK_CLIENT_PORT = "2181"; |
| |
| /** |
| * Gets a comma-separate list of the ZK servers along with their ports. |
| * |
| * @param cluster |
| * the cluster (not {@code null}). |
| * @return the list of FQDN ZooKeeper hosts, or an empty string (never |
| * {@code null}). |
| */ |
| static String getZooKeeperQuorumString(Cluster cluster) { |
| |
| // attempt to calculate the port |
| String zkClientPort = DEFAULT_ZK_CLIENT_PORT; |
| Config zooConfig = cluster.getDesiredConfigByType(ZOO_CFG_CONFIG_TYPE); |
| if (zooConfig != null) { |
| Map<String, String> zooProperties = zooConfig.getProperties(); |
| if (zooProperties.containsKey(ZOOKEEPER_CLIENT_PORT_PROPERTY_NAME)) { |
| zkClientPort = zooProperties.get(ZOOKEEPER_CLIENT_PORT_PROPERTY_NAME); |
| } |
| } |
| |
| // get all known ZK hosts |
| List<ServiceComponentHost> zkServers = cluster.getServiceComponentHosts( |
| Service.Type.ZOOKEEPER.name(), Role.ZOOKEEPER_SERVER.name()); |
| |
| List<String> zkAddresses = new ArrayList<>(); |
| for (ServiceComponentHost zkServer : zkServers) { |
| String zkAddress = zkServer.getHostName() + ":" + zkClientPort; |
| zkAddresses.add(zkAddress); |
| } |
| |
| // join on comma without any spaces |
| String zkServersStr = StringUtils.join(zkAddresses, ","); |
| return zkServersStr; |
| } |
| } |