Preferred nutch cluster network topology ?

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Preferred nutch cluster network topology ?

brainstorm-2-2
Regarding real world nutch clusters (>10 nodes) what's the approach
you follow to maximise fetches throughput ?

For instance, my guess is that the "classical" number-crunching (HPC)
scientific network cluster topology (intra-cluster private network
plus 1 head node with "outside world" connection), it's suboptimal in
a nutch deployment: network bottleneck in head node while crawling
inet.

So what do you suggest in that matter ?

Thanks in advance !