| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.hdfs.server.namenode; |
| |
| import javax.annotation.Nullable; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSUtilClient; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.net.URI; |
| import java.util.Collection; |
| |
| import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DEFAULT_NAME_KEY; |
| import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_HA_NAMENODES_KEY_PREFIX; |
| import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RPC_ADDRESS_KEY; |
| |
| /** |
| * Utility functions for the NameNode. |
| */ |
| @InterfaceAudience.Private |
| public final class NameNodeUtils { |
| public static final Logger LOG = LoggerFactory.getLogger(NameNodeUtils.class); |
| |
| /** |
| * Return the namenode address that will be used by clients to access this |
| * namenode or name service. This needs to be called before the config |
| * is overriden. |
| * |
| * This method behaves as follows: |
| * |
| * 1. fs.defaultFS is undefined: |
| * - return null. |
| * 2. fs.defaultFS is defined but has no hostname (logical or physical): |
| * - return null. |
| * 3. Single NN (no HA, no federation): |
| * - return URI authority from fs.defaultFS |
| * 4. Current NN is in an HA nameservice (with or without federation): |
| * - return nameservice for current NN. |
| * 5. Current NN is in non-HA namespace, federated cluster: |
| * - return value of dfs.namenode.rpc-address.[nsId].[nnId] |
| * - If the above key is not defined, then return authority from |
| * fs.defaultFS if the port number is > 0. |
| * 6. If port number in the authority is missing or zero in step 6: |
| * - return null |
| */ |
| @VisibleForTesting |
| @Nullable |
| static String getClientNamenodeAddress( |
| Configuration conf, @Nullable String nsId) { |
| final Collection<String> nameservices = |
| DFSUtilClient.getNameServiceIds(conf); |
| |
| final String nnAddr = conf.get(FS_DEFAULT_NAME_KEY); |
| if (nnAddr == null) { |
| // default fs is not set. |
| return null; |
| } |
| |
| LOG.info("{} is {}", FS_DEFAULT_NAME_KEY, nnAddr); |
| final URI nnUri = URI.create(nnAddr); |
| |
| String defaultNnHost = nnUri.getHost(); |
| if (defaultNnHost == null) { |
| return null; |
| } |
| |
| // Current Nameservice is HA. |
| if (nsId != null && nameservices.contains(nsId)) { |
| final Collection<String> namenodes = conf.getTrimmedStringCollection( |
| DFS_HA_NAMENODES_KEY_PREFIX + "." + nsId); |
| if (namenodes.size() > 1) { |
| return nsId; |
| } |
| } |
| |
| // Federation without HA. We must handle the case when the current NN |
| // is not in the default nameservice. |
| String currentNnAddress = null; |
| if (nsId != null) { |
| String hostNameKey = DFS_NAMENODE_RPC_ADDRESS_KEY + "." + nsId; |
| currentNnAddress = conf.get(hostNameKey); |
| } |
| |
| // Fallback to the address in fs.defaultFS. |
| if (currentNnAddress == null) { |
| currentNnAddress = nnUri.getAuthority(); |
| } |
| |
| int port = 0; |
| if (currentNnAddress.contains(":")) { |
| port = Integer.parseInt(currentNnAddress.split(":")[1]); |
| } |
| |
| if (port > 0) { |
| return currentNnAddress; |
| } else { |
| // the port is missing or 0. Figure out real bind address later. |
| return null; |
| } |
| } |
| |
| private NameNodeUtils() { |
| // Disallow construction |
| } |
| } |