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From วรพล เจนกิจธัญไพบูลย์ <s4510...@hotmail.com>
Subject Remote access to namenode is not allowed despite the services are already started.
Date Sun, 01 Jan 2012 14:26:49 GMT

Dear all,
   I successfully installed and run Hadoop on a single machine whose ip is 192.168.1.109 (In
fact it is actually an Ubuntu instance running on virtual box ) . When typing jps it shows2473
DataNode2765 TaskTracker3373 Jps2361 NameNode2588 SecondaryNameNode2655 JobTracker
 This should mean that the hadoop is up and running.Running commands like ./hadoop fs -ls
is fine and produces the expected result.
But If I try to connect it from my windows box whose ip is 192.168.1.80 by writingJava code's
HDFS API to connect it as follows: Configuration conf = new Configuration();FileSystem hdfs
= null;Path filenamePath = new Path(FILE_NAME);
hdfs = FileSystem.get(conf); <-- the problem occurred at this line
when I run the code, the error displayed as follows:
11/12/07 20:37:24 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000. Already
tried 0 time(s).11/12/07 20:37:26 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 1 time(s).11/12/07 20:37:28 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 2 time(s).11/12/07 20:37:30 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 3 time(s).11/12/07 20:37:32 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 4 time(s).11/12/07 20:37:33 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 5 time(s).11/12/07 20:37:35 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 6 time(s).11/12/07 20:37:37 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 7 time(s).11/12/07 20:37:39 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000.
Already tried 8 time(s).11/12/07 20:37:41 
 INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000. Already tried 9 time(s).java.net.ConnectException:
Call to /192.168.1.109:9000 failed on  connection exception: java.net.ConnectException: Connection
refused: no further information	To make sure if the socket is already opened and waits for
the incoming connections on the hadoop serer, I netstat on the ubuntu boxthe result shows
as follows:

tcp        0      0 localhost:51201         *:*                     LISTEN      2765/java
      tcp        0      0 *:50020                 *:*                     LISTEN      2473/java
      tcp        0      0 localhost:9000          *:*                     LISTEN      2361/java
      tcp        0      0 localhost:9001          *:*                     LISTEN      2655/java
      tcp        0      0 *:mysql                 *:*                     LISTEN      -  
            tcp        0      0 *:50090                 *:*                     LISTEN   
  2588/java       tcp        0      0 *:11211                 *:*                     LISTEN
     -               tcp        0      0 *:40843                 *:*                     LISTEN
     2473/java       tcp        0      0 *:58699                 *:*                     LISTEN
     -               tcp        0      0 *:50060                 *:*                     LISTEN
     2765/java       tcp        0      0 *:50030   
               *:*                     LISTEN      2655/java       tcp        0      0 *:53966
                *:*                     LISTEN      2655/java       tcp        0      0 *:www
                  *:*                     LISTEN      -               tcp        0      0
*:epmd                  *:*                     LISTEN      -               tcp        0 
    0 *:55826                 *:*                     LISTEN      2588/java       tcp    
   0      0 *:ftp                   *:*                     LISTEN      -               tcp
       0      0 *:50070                 *:*                     LISTEN      2361/java    
  tcp        0      0 *:52822                 *:*                     LISTEN      2361/java
      tcp        0      0 *:ssh                   *:*                     LISTEN      -  
            tcp        0      0 *:55672                 *:*                     LISTEN   
  -               tcp        0      0 *:50010                 *:*            
          LISTEN      2473/java       tcp        0      0 *:50075                 *:*    
                LISTEN      2473/java    
I noticed that if the local address column is something like localhost:9000 (starts with localhost:
not *:)It will not be able to be connected from remote host or even in it own box in some
case.I tried telnet localhost 9000  it works, I means it can connect to the port but If I
use telnet 192.168.1.109 9000The errors displays like
$ telnet 192.168.1.109 9000Trying 192.168.1.109...telnet: Unable to connect to remote host:
Connection refused
I have spent almost a week figuring out the issue I am really exhausted now and I hope someone
can help me.
Note: I am not sure if namenode by default refuses remote connection. Do I need to change
some settings in order for it to allowremote connections?
Best regards,Woraphol

 		 	   		  
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