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From "Eric Anderson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6429) Server listener binds to wrong IP address for domain name given
Date Thu, 10 Dec 2009 16:10:18 GMT
Server listener binds to wrong IP address for domain name given
---------------------------------------------------------------

                 Key: HADOOP-6429
                 URL: https://issues.apache.org/jira/browse/HADOOP-6429
             Project: Hadoop Common
          Issue Type: Bug
          Components: ipc
    Affects Versions: 0.22.0
         Environment: Ubuntu Linux,  kernel 2.6.24-25-server, x86_64 architecture.  Java 1.6.0.,
OpenJDK.  Server has 4 physical Ethernet cards,  configured as follows: {{eth0}} is assigned
an IP address {{external-ip}}.  {{eth1}}-{{eth3}} are bonded as {{bond0}}, which is assigned
an IP address {{internal-ip}}.  This server has two dns entries: {{external-dns}} which resolves
to {{external-ip}} and {{internal-dns}} which resolves to {{internal-ip}}.
            Reporter: Eric Anderson


High-level: 
In my configuration files, I specifiy:
{code:xml} 
<property>
    <name>fs.default.name</name>
    <value>hdfs://{{internal-dns}}:8020</value>
 </property>
{code}

The name node server binds to address {{external-ip}}:8020, while all the data nodes try to
connect to {{internal-ip}}:8020, and nothing works.

Low-level: I've traced this down as far as {{org.apache.hadoop.ipc.Server}}, private class
{{Listener}}.  
{code:java}
  /** Listens on the socket. Creates jobs for the handler threads*/
  private class Listener extends Thread {
    
    private ServerSocketChannel acceptChannel = null; //the accept channel
    private Selector selector = null; //the selector that we use for the server
    private InetSocketAddress address; //the address we bind at
    private Random rand = new Random();
    private long lastCleanupRunTime = 0; //the last time when a cleanup connec-
                                         //-tion (for idle connections) ran
    private long cleanupInterval = 10000; //the minimum interval between 
                                          //two cleanup runs
    private int backlogLength = conf.getInt("ipc.server.listen.queue.size", 128);
    
    public Listener() throws IOException {
      address = new InetSocketAddress(bindAddress, port);
      LOG.info("in Server/Listener. bindAddress=" + bindAddress + ", address="+address); 
  //Added by EA for testing
      // Create a new server socket and set to non blocking mode
      acceptChannel = ServerSocketChannel.open();
      acceptChannel.configureBlocking(false);

      // Bind the server socket to the local host and port
      bind(acceptChannel.socket(), address, backlogLength);
      port = acceptChannel.socket().getLocalPort(); //Could be an ephemeral port
{code}

The problem  seems to be in the line {code}address = new InetSocketAddress(bindAddress, port);{code}.
 bindAddress  contains the DNS name of the *internal* interface, but address comes out with
the IP address of the *external* interface.



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