| /** |
| * 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.bookkeeper.net; |
| |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.bookkeeper.conf.Configurable; |
| import org.apache.bookkeeper.proto.BookieAddressResolver; |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.commons.lang.StringUtils; |
| |
| /** |
| * This is a base class for DNS to Switch mappings. |
| * |
| * <p>It is not mandatory to derive {@link DNSToSwitchMapping} implementations from it, but it is strongly |
| * recommended, as it makes it easy for the Hadoop developers to add new methods |
| * to this base class that are automatically picked up by all implementations. |
| * |
| * <p>This class does not extend the <code>Configured</code> |
| * base class, and should not be changed to do so, as it causes problems |
| * for subclasses. The constructor of the <code>Configured</code> calls |
| * the {@link #setConf(Configuration)} method, which will call into the |
| * subclasses before they have been fully constructed. |
| * |
| */ |
| public abstract class AbstractDNSToSwitchMapping implements DNSToSwitchMapping, Configurable { |
| |
| private Configuration conf; |
| private BookieAddressResolver bookieAddressResolver; |
| |
| /** |
| * Create an unconfigured instance. |
| */ |
| protected AbstractDNSToSwitchMapping() { |
| } |
| |
| /** |
| * Create an instance, caching the configuration file. |
| * This constructor does not call {@link #setConf(Configuration)}; if |
| * a subclass extracts information in that method, it must call it explicitly. |
| * @param conf the configuration |
| */ |
| protected AbstractDNSToSwitchMapping(Configuration conf) { |
| this.conf = conf; |
| } |
| |
| public BookieAddressResolver getBookieAddressResolver() { |
| return bookieAddressResolver; |
| } |
| |
| @Override |
| public void setBookieAddressResolver(BookieAddressResolver bookieAddressResolver) { |
| this.bookieAddressResolver = bookieAddressResolver; |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| validateConf(); |
| } |
| |
| /** |
| * Predicate that indicates that the switch mapping is known to be |
| * single-switch. The base class returns false: it assumes all mappings are |
| * multi-rack. Subclasses may override this with methods that are more aware |
| * of their topologies. |
| * |
| * <p>This method is used when parts of Hadoop need know whether to apply |
| * single rack vs multi-rack policies, such as during block placement. |
| * Such algorithms behave differently if they are on multi-switch systems. |
| * |
| * @return true if the mapping thinks that it is on a single switch |
| */ |
| public boolean isSingleSwitch() { |
| return false; |
| } |
| |
| /** |
| * Get a copy of the map (for diagnostics). |
| * @return a clone of the map or null for none known |
| */ |
| public Map<String, String> getSwitchMap() { |
| return null; |
| } |
| |
| /** |
| * Generate a string listing the switch mapping implementation, |
| * the mapping for every known node and the number of nodes and |
| * unique switches known about -each entry to a separate line. |
| * @return a string that can be presented to the ops team or used in |
| * debug messages. |
| */ |
| public String dumpTopology() { |
| Map<String, String> rack = getSwitchMap(); |
| StringBuilder builder = new StringBuilder(); |
| builder.append("Mapping: ").append(toString()).append("\n"); |
| if (rack != null) { |
| builder.append("Map:\n"); |
| Set<String> switches = new HashSet<String>(); |
| for (Map.Entry<String, String> entry : rack.entrySet()) { |
| builder.append(" ").append(entry.getKey()).append(" -> ").append(entry.getValue()).append("\n"); |
| switches.add(entry.getValue()); |
| } |
| builder.append("Nodes: ").append(rack.size()).append("\n"); |
| builder.append("Switches: ").append(switches.size()).append("\n"); |
| } else { |
| builder.append("No topology information"); |
| } |
| return builder.toString(); |
| } |
| |
| protected boolean isSingleSwitchByScriptPolicy() { |
| return conf != null |
| && (!StringUtils.isNotBlank(conf.getString(CommonConfigurationKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY))); |
| } |
| |
| /** |
| * Query for a {@link DNSToSwitchMapping} instance being on a single |
| * switch. |
| * |
| * <p>This predicate simply assumes that all mappings not derived from |
| * this class are multi-switch. |
| * |
| * @param mapping the mapping to query |
| * @return true if the base class says it is single switch, or the mapping |
| * is not derived from this class. |
| */ |
| public static boolean isMappingSingleSwitch(DNSToSwitchMapping mapping) { |
| return mapping != null && mapping instanceof AbstractDNSToSwitchMapping |
| && ((AbstractDNSToSwitchMapping) mapping).isSingleSwitch(); |
| } |
| |
| /** |
| * when setConf is called it should do sanity checking of the conf/env. and |
| * throw RuntimeException if things are not valid. |
| */ |
| protected void validateConf() { |
| } |
| } |