[talks] R Wang MSE thesis talk

[Melissa Lawson]

Richard Wang will present his master's thesis talk on Friday April 22 at 10:30AM in 

Room 301.  His advisor is Jen Rexford.  Everyone is invited to attend his talk. His 

abstract follows below.

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abstract:
Today's data centers host online services on multiple servers, with a front-end load
balancer directing each client request to a particular replica. Dedicated load balancers
are expensive and quickly become a single point of failure and congestion. The OpenFlow
standard enables an alternative approach where the commodity network switches divide
traffic over the server replicas, based on packet-handling rules installed by a separate
controller. However, the simple approach of installing a separate rule for each client
connection (or "microflow") leads to a huge number of rules in the switches and a heavy
load on the controller. We argue that the controller should exploit switch support for
wildcard rules for a more scalable solution that directs large aggregates of client
traffic to server replicas. We present algorithms that compute concise wildcard rules that
achieve a target distribution of the traffic, and automatically adjust to changes in
load-balancing policies without disrupting existing connections. We implement these
algorithms on top of the NOX OpenFlow controller, evaluate their effectiveness, and
propose several avenues for further research. 



 

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