Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Newbie on hadoop clusters.
I have setup my two nodes conf as described by M. G. Noll here.

The datanode has datanode & tasktracker running (jps command show them).

However in the WEB UI I only see one node for the DFS

Live Node : 1  
Dead Node : 0

Same thing on the MapRed WEB interface.
Datanode logs on slave are just empty.
Did check the network settings both nodes have access to each other on relevant ports. Did make sure namespaceID are the same.

share|improve this question
Looks like my UFW is blocking the transfers, works fine for starting up/shutting down the cluster though. – millebii Jun 1 '11 at 22:40
up vote 0 down vote accepted

There was an error in the UFW settings.

share|improve this answer
Please explain what error you faced? – Code Santa Jun 6 at 7:19

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.