| /** |
| * 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.hbase; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configured; |
| |
| |
| /** |
| * ClusterManager is an api to manage servers in a distributed environment. It provides services |
| * for starting / stopping / killing Hadoop/HBase daemons. Concrete implementations provide actual |
| * functionality for carrying out deployment-specific tasks. |
| */ |
| @InterfaceAudience.Private |
| public abstract class ClusterManager extends Configured { |
| protected static final Log LOG = LogFactory.getLog(ClusterManager.class); |
| |
| private static final String SIGKILL = "SIGKILL"; |
| private static final String SIGSTOP = "SIGSTOP"; |
| private static final String SIGCONT = "SIGCONT"; |
| |
| public ClusterManager() { |
| } |
| |
| /** |
| * Type of the service daemon |
| */ |
| public static enum ServiceType { |
| HADOOP_NAMENODE("namenode"), |
| HADOOP_DATANODE("datanode"), |
| HADOOP_JOBTRACKER("jobtracker"), |
| HADOOP_TASKTRACKER("tasktracker"), |
| HBASE_MASTER("master"), |
| HBASE_REGIONSERVER("regionserver"); |
| |
| private String name; |
| |
| ServiceType(String name) { |
| this.name = name; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public String toString() { |
| return getName(); |
| } |
| } |
| |
| /** |
| * Start the service on the given host |
| */ |
| public abstract void start(ServiceType service, String hostname) throws IOException; |
| |
| /** |
| * Stop the service on the given host |
| */ |
| public abstract void stop(ServiceType service, String hostname) throws IOException; |
| |
| /** |
| * Restart the service on the given host |
| */ |
| public abstract void restart(ServiceType service, String hostname) throws IOException; |
| |
| /** |
| * Send the given posix signal to the service |
| */ |
| public abstract void signal(ServiceType service, String signal, |
| String hostname) throws IOException; |
| |
| /** |
| * Kill the service running on given host |
| */ |
| public void kill(ServiceType service, String hostname) throws IOException { |
| signal(service, SIGKILL, hostname); |
| } |
| |
| /** |
| * Suspend the service running on given host |
| */ |
| public void suspend(ServiceType service, String hostname) throws IOException { |
| signal(service, SIGSTOP, hostname); |
| } |
| |
| /** |
| * Resume the services running on given hosts |
| */ |
| public void resume(ServiceType service, String hostname) throws IOException { |
| signal(service, SIGCONT, hostname); |
| } |
| |
| /** |
| * Returns whether the service is running on the remote host. This only checks whether the |
| * service still has a pid. |
| */ |
| public abstract boolean isRunning(ServiceType service, String hostname) throws IOException; |
| |
| /* TODO: further API ideas: |
| * |
| * //return services running on host: |
| * ServiceType[] getRunningServicesOnHost(String hostname); |
| * |
| * //return which services can be run on host (for example, to query whether hmaster can run on this host) |
| * ServiceType[] getRunnableServicesOnHost(String hostname); |
| * |
| * //return which hosts can run this service |
| * String[] getRunnableHostsForService(ServiceType service); |
| */ |
| |
| } |