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Marc Sturlese commented on Marc Sturlese's blog post 'datanode can not connect to the namenode in a small hadoop cluster'

Solved. The problem was the /etc/hosts. As far as I understand now all nodes must have the ip and hostname of all members of the cluster (and themselves, of course). So, my /etc/hosts for both nodes now looks like (I am running under ubuntu boxes):…

February 15

Marc Sturlese commented on Marc Sturlese's blog post 'datanode can not connect to the namenode in a small hadoop cluster'

Yes, looking at the logs seems they are. Actually if I stop the daemonds with ./stop-hdfs.sh and ./stop.mapred.sh I can see the messages that namenode, jobtracker and the 2 datanodes and tasktrackers are being shut down. When they are up I can use h…

February 15

Jason Venner commented on Marc Sturlese's blog post 'datanode can not connect to the namenode in a small hadoop cluster'

Can you verify that the Namenode, and Datanode server processes are running.

February 15

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Marc Sturlese's Blog

datanode can not connect to the namenode in a small hadoop cluster

Hey there I have a hadoop cluster build on 2 servers (2 laptops). One node (A)

contains the namenode, a datanode, the jobtraker and a tasktraker.

The other node(B) just has a datanode and a tasktraker.

I set up correctly hdfs with ./start-hdfs.sh

When I try to set up MapReduce with ./start-mapred.sh the
TaskTraker of node (B) can not connect to the namenode. The tasktracker log will

keep throwing:

INFO org.apache.hadoop.ipc.Client: Retrying conne… Continue

Posted on February 15, 2010 at 7:00am — 3 Comments