Michiel Vanderlee created HADOOP-12914: ------------------------------------------
Summary: RPC client should deal with the IP address change Key: HADOOP-12914 URL: https://issues.apache.org/jira/browse/HADOOP-12914 Project: Hadoop Common Issue Type: Bug Components: ipc Affects Versions: 2.7.2 Environment: CentOS 7 Reporter: Michiel Vanderlee I'm seeing HADOOP-7472 again for the datanode in v2.7.2. If I start the datanode before the dns entry the namenode resolve, it never retries to resolve and keeps failing with a UnknownHostException. A restart or the datanode fixes this. TRACE ipc.ProtobufRpcEngine: 31: Exception <- nn1.hdfs-namenode-rpc.service.consul:8020: versionRequest {java.net.UnknownHostException: Invalid host name: local host is: (unknown); destination host is: "nn1.hdfs-namenode-rpc.service.consul":8020; java.net.UnknownHostException; For more details see: http://wiki.apache.org/hadoop/UnknownHost} The error comes from: org.apache.hadoop.ipc.Client..java$Connection line: 409 public Connection(ConnectionId remoteId, int serviceClass) throws IOException { this.remoteId = remoteId; this.server = remoteId.getAddress(); if (server.isUnresolved()) { throw NetUtils.wrapException(server.getHostName(), server.getPort(), null, 0, new UnknownHostException()); } The remoteId.address (InetSocketAddress) seems to only resolves on creation, never again unless done manually. -- This message was sent by Atlassian JIRA (v6.3.4#6332)