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From Praveen Sripati <praveensrip...@gmail.com>
Subject Re: connection between slaves and master
Date Tue, 10 Jan 2012 09:54:16 GMT
Mark,

> [mark@node67 ~]$ telnet node77

You need to specify the port number along with the server name like `telnet
node77 1234`.

> 2012-01-09 10:04:03,436 INFO org.apache.hadoop.ipc.Client: Retrying
connect to server: localhost/127.0.0.1:12123. Already tried 0 time(s).

Slaves are not able to connect to the master. The configurations `
fs.default.name` and `mapred.job.tracker` should point to the master and
not to localhost when the master and slaves are on different machines.

Praveen

On Mon, Jan 9, 2012 at 11:41 PM, Mark question <markq2011@gmail.com> wrote:

> Hello guys,
>
>  I'm requesting from a PBS scheduler a number of  machines to run Hadoop
> and even though all hadoop daemons start normally on the master and slaves,
> the slaves don't have worker tasks in them. Digging into that, there seems
> to be some blocking between nodes (?) don't know how to describe it except
> that on slave if I "telnet master-node"  it should be able to connect, but
> I get this error:
>
> [mark@node67 ~]$ telnet node77
>
> Trying 192.168.1.77...
> telnet: connect to address 192.168.1.77: Connection refused
> telnet: Unable to connect to remote host: Connection refused
>
> The log at the slave nodes shows the same thing, even though it has
> datanode and tasktracker started from the maste (?):
>
> 2012-01-09 10:04:03,436 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 0 time(s).
> 2012-01-09 10:04:04,439 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 1 time(s).
> 2012-01-09 10:04:05,442 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 2 time(s).
> 2012-01-09 10:04:06,444 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 3 time(s).
> 2012-01-09 10:04:07,446 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 4 time(s).
> 2012-01-09 10:04:08,448 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 5 time(s).
> 2012-01-09 10:04:09,450 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 6 time(s).
> 2012-01-09 10:04:10,452 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 7 time(s).
> 2012-01-09 10:04:11,454 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 8 time(s).
> 2012-01-09 10:04:12,456 INFO org.apache.hadoop.ipc.Client: Retrying
> connect
> to server: localhost/127.0.0.1:12123. Already tried 9 time(s).
> 2012-01-09 10:04:12,456 INFO org.apache.hadoop.ipc.RPC: Server at
> localhost/
> 127.0.0.1:12123 not available yet, Zzzzz...
>
>  Any suggestions of what I can do?
>
> Thanks,
> Mark
>

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