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Re: HDFS Ports
The read port of data node is random, but I think you can forbid the
port on namenode becuase each read operation should access namenode
first.

On Fri, Sep 3, 2010 at 12:53 AM, Stephan Gammeter
<[EMAIL PROTECTED]> wrote:
> 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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Best Regards

Jeff Zhang