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From Matei Zaharia <>
Subject Re: Problems with Slave WebUI
Date Thu, 18 Aug 2011 18:03:57 GMT

On Aug 18, 2011, at 1:25 AM, Ted Dunning wrote:

> It should be noted that the public names resolve to internal address inside
> EC2.  That means that traffic runs as cheaply as possible.

Oh cool, that's good to know.

> Regarding the identification of a host, the idea that there is a DNS name on
> the far side of the connections that matches anything on the local side is
> just incorrect.   A single machine has to be considered to have multiple
> interfaces, multiple versions of host name and multiple names that resolve
> to addresses that reach it from other machines.  That these don't match up
> very well is only to be expected.

This would definitely be ideal, but the problem is that our apps depend on a system that makes
this assumption (HDFS). Hostnames are how HDFS communicates location information to clients
such as the JobTracker.

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