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From Larry Compton <>
Subject Giraph 1.0.0 - Netty port allocation
Date Fri, 22 Nov 2013 17:15:14 GMT
My teammates and I are running Giraph on a cluster where a firewall is
configured on each compute node. We had 100 ports opened on the compute
nodes, which we thought would be more than enough to accommodate a large
number of workers. However, we're unable to go beyond about 90 workers with
our Giraph jobs, due to Netty ports being allocated outside of the range
(30000-30100). We're not sure why this is happening. We shouldn't be
running more than one worker per compute node, so we were assuming that
only port 30000 would be used, but we're routinely seeing Giraph try to use
ports greater than 30100 when we request close to 100 workers. This leads
us to believe that a simple one up numbering scheme is being used that
doesn't take the host into consideration, although this is only speculation.

Is there a way around this problem? Our system admins understandably balked
at opening 1000 ports.


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