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From "Nelson, William" <wne...@email.uky.edu>
Subject IP address or host name
Date Mon, 24 Aug 2009 16:25:46 GMT
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.


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