hadoop DomainNameResolver 源码

  • 2022-10-20
  • 浏览 (402)

haddop DomainNameResolver 代码

文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DomainNameResolver.java

/**
 * 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.net;

import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * This interface provides methods for the failover proxy to get IP addresses
 * of the associated servers (NameNodes, RBF routers etc). Implementations will
 * use their own service discovery mechanism, DNS, Zookeeper etc
 */
public interface DomainNameResolver {
  /**
   * Takes one domain name and returns its IP addresses based on the actual
   * service discovery methods.
   *
   * @param domainName input domainName.
   * @return all IP addresses
   * @throws UnknownHostException indicate that the IP address of a
   * host could not be determined.
   */
  InetAddress[] getAllByDomainName(String domainName)
      throws UnknownHostException;

  /**
   * Reverse lookup an IP address and get the fully qualified domain name(fqdn).
   *
   * @param address input address.
   * @return fully qualified domain name
   */
  String getHostnameByIP(InetAddress address);

  /**
   * This function combines getAllByDomainName and getHostnameByIP, for a single
   * domain name, it will first do a forward lookup to get all of IP addresses,
   * then for each IP address, it will do a reverse lookup to get the fqdn.
   * This function is necessary in secure environment since Kerberos uses fqdn
   * in the service principal instead of IP.
   *
   * @param domainName input domainName.
   * @param useFQDN input useFQDN.
   * @return all fully qualified domain names belonging to the IPs resolved from
   * the input domainName
   * @throws UnknownHostException indicate that the IP address of a
   * host could not be determined.
   */
   String[] getAllResolvedHostnameByDomainName(
       String domainName, boolean useFQDN) throws UnknownHostException;
}

相关信息

hadoop 源码目录

相关文章

hadoop AbstractDNSToSwitchMapping 源码

hadoop CachedDNSToSwitchMapping 源码

hadoop ConnectTimeoutException 源码

hadoop DNS 源码

hadoop DNSDomainNameResolver 源码

hadoop DNSToSwitchMapping 源码

hadoop DNSToSwitchMappingWithDependency 源码

hadoop DomainNameResolverFactory 源码

hadoop InnerNode 源码

hadoop InnerNodeImpl 源码

0  赞