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From Harsh J <qwertyman...@gmail.com>
Subject Re: Connection refused problem
Date Fri, 22 Oct 2010 09:54:43 GMT
On Fri, Oct 22, 2010 at 2:45 PM, Biju .B <bijubkbk@gmail.com> wrote:
> Hi all
>
> I have started hadoop and its running
>
> am getting following error when i try to execute a simple map reduce program
>
> root@cjb3f-69:/home/media/Desktop# hadoop-0.20 jar HadoopSample.jar
> HadoopSample input output
> 10/10/22 14:41:58 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 0 time(s).
> 10/10/22 14:41:59 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 1 time(s).
> 10/10/22 14:42:00 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 2 time(s).
> 10/10/22 14:42:01 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 3 time(s).
> 10/10/22 14:42:02 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 4 time(s).
> 10/10/22 14:42:03 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 5 time(s).
> 10/10/22 14:42:04 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 6 time(s).
> 10/10/22 14:42:05 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 7 time(s).
> 10/10/22 14:42:06 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 8 time(s).
> 10/10/22 14:42:07 INFO ipc.Client: Retrying connect to server: localhost/
> 127.0.0.1:8020. Already tried 9 time(s).
> Exception in thread "main" java.lang.RuntimeException:
> java.net.ConnectException: Call to localhost/127.0.0.1:8020 failed on
> connection exception: java.net.ConnectException: Connection refused
>    at
> org.apache.hadoop.mapred.JobConf.getWorkingDirectory(JobConf.java:370)
>    at
> org.apache.hadoop.mapred.FileOutputFormat.setOutputPath(FileOutputFormat.java:125)
>    at HadoopSample.main(HadoopSample.java:55)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> Caused by: java.net.ConnectException: Call to
> localhost/127.0.0.1:8020failed on connection exception:
> java.net.ConnectException: Connection
> refused
>    at org.apache.hadoop.ipc.Client.wrapException(Client.java:845)
>    at org.apache.hadoop.ipc.Client.call(Client.java:821)
>    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:221)
>    at $Proxy0.getProtocolVersion(Unknown Source)
>    at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:363)
>    at
> org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:110)

Is your NameNode configured to listen on the localhost interface (lo)?
Is it up, if so? Check jps output and the namenode logs in
$HADOOP_HOME/logs directory.

> can any one help.
>
> I am using cloudera hadoop on Ubuntu

There is a CDH specific mailing list also available at
https://groups.google.com/a/cloudera.org/group/cdh-user/topics for CDH
Users.


-- 
Harsh J
www.harshj.com

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