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From Stephan Gammeter <gamme...@vision.ee.ethz.ch>
Subject HDFS Ports
Date Fri, 03 Sep 2010 07:53:00 GMT
We are trying to secure our HDFS installation by blocking all the ports that HDFS requires
to the outside world. 
Unfortunately it's not possible to give our machines private IPs (... dont ask me why... ).
So we were starting to 
compile a list of ports that HDFS uses, so we can specifically block traffic to these ports.
So far we found that we can 
configure the following ports:

dfs.datanode.http.address – 50075
dfs.datanode.address – 50010
dfs.datanode.ipc.address – 50020

however we found via netstat -ltp that the HDFS datanode also listens on another random port
and so far we've been 
unable to determine what that port is used for and how to configure it to be on a fixed port.
Can anyone help with this?

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