| /** |
| * 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.test.system.process; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Interface to manage the remote processes in the cluster. |
| */ |
| public interface ClusterProcessManager { |
| |
| /** |
| * Initialization method to pass the configuration object which is required |
| * by the ClusterProcessManager to manage the cluster.<br/> |
| * Configuration object should typically contain all the parameters which are |
| * required by the implementations.<br/> |
| * |
| * @param conf configuration containing values of the specific keys which |
| * are required by the implementation of the cluster process manger. |
| * |
| * @throws IOException when initialization fails. |
| */ |
| void init(Configuration conf) throws IOException; |
| |
| /** |
| * Get the list of RemoteProcess handles of all the remote processes. |
| */ |
| List<RemoteProcess> getAllProcesses(); |
| |
| /** |
| * Get all the roles this cluster's daemon processes have. |
| */ |
| Set<Enum<?>> getRoles(); |
| |
| /** |
| * Method to start all the remote daemons.<br/> |
| * |
| * @throws IOException if startup procedure fails. |
| */ |
| void start() throws IOException; |
| |
| /** |
| * Starts the daemon from the user specified conf dir. |
| * @param newConfLocation the dir where the new conf files reside. |
| * @throws IOException if start from new conf fails. |
| */ |
| void start(String newConfLocation) throws IOException; |
| |
| /** |
| * Stops the daemon running from user specified conf dir. |
| * |
| * @param newConfLocation the dir where the new conf files reside. |
| * @throws IOException if stop from new conf fails. |
| */ |
| void stop(String newConfLocation) throws IOException; |
| |
| /** |
| * Method to shutdown all the remote daemons.<br/> |
| * |
| * @throws IOException if shutdown procedure fails. |
| */ |
| void stop() throws IOException; |
| |
| /** |
| * Gets if multi-user support is enabled for this cluster. |
| * <br/> |
| * @return true if multi-user support is enabled. |
| * @throws IOException if RPC returns error. |
| */ |
| boolean isMultiUserSupported() throws IOException; |
| |
| /** |
| * The pushConfig is used to push a new config to the daemons. |
| * @param localDir |
| * @return is the remoteDir location where config will be pushed |
| * @throws IOException if pushConfig fails. |
| */ |
| String pushConfig(String localDir) throws IOException; |
| } |