hadoop-common-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Bill Habermaas" <b...@habermaas.us>
Subject RE: IP address or host name
Date Mon, 24 Aug 2009 16:52:05 GMT
The problem resolved by HADOOP-5191 involves client connection to the name
node and has nothing to do with connections between the master and slave. 

In my configuration I use IP addresses exclusively.  Mixing hostnames and IP
addresses leads to all kinds of problems. 


-----Original Message-----
From: Nelson, William [mailto:wnels2@email.uky.edu] 
Sent: Monday, August 24, 2009 12:26 PM
To: common-user@hadoop.apache.org
Subject: IP address or host name 

I'm new to hadoop.
I'm running 0.19.2 on a Centos 5.2  cluster.
I have been having problems with the nodes connecting to the master (even
when the firewall is off) using the hostname  in the hadoop-site.xml but it
will connect using the IP address.
 This is also true trying to connect to port 9000 with telnet. If I start
hadoop with hostnames in the hadoop-site.xml, I get  Connection refused.
When I use IP addresses in the hadoop-site.xml I can connect with telnet
using either the IP address or hostname.
The datanode running on the master node can connect with either IP address
or hostname in the hadoop-site.xml.
I have found this problem posted a couple of time but have not found the
answer yet.

Datanodes on slaves can't connect but the datanode on master can connect.

Everybody can connect.

Unfortunately  using IP addresses creates another problem when I try to run
the job: Wrong FS exception

Previous posts refer to https://issues.apache.org/jira/browse/HADOOP-5191
but it appears the work around is to switch back to host names, which I
can't get to work.

Thanks in advance for any help.


View raw message