Binding Clients to Replicated Servers: Initial and Continuous Binding

1
Binding Clients to Replicated Servers Initial
and Continuous Binding Hyewon Jun, Matt Sanders,
Mostafa Ammar, and Ellen Zegura Networking and
Telecommunication Group, College of Computing,
Georgia Institute of Technology
Introduction
Results with Multiple Clients
Migration of a CB Client

• Motivation
• Performance change of servers during a large file
  transmission
• Goal
• Improve the performance of connections to the
  replicated servers with support of optimal
  server binding mechanisms.
• Approach
• Propose and evaluate a Continuous Binding scheme
• Compare two binding scheme extremes to one
  another and answer whether Continuous Binding
  can outperform Initial Binding

Increasing use of either scheme over the other by
all clients with long-lived connections leads to
overall performance degradation.
IB and CB Connection Performance
Spectrum of Binding
Application Model
Conclusion

• Multiple bindings can be beneficial to improve
  connection throughput. However, binding schemes
  require careful design to avoid hot-spot shifting
  created by synchronized bindings

Initial Binding (IB) Select one server and stay
with it during the connection life time Periodic
Binding (PB) Periodically select a server and
switch to the new server. Continuous Binding (CB)
Select the best server per packet to react
fast to the server performance change

• The result with multiple clients implies that
  network layer solutions currently being included
  in the design of IPv6 may not be useful for the
  data plane of connection based application.

• Server Selection
• Network layer selection
• Application layer selection
• Server Binding
• When to invoke the server selection function and
  to switch its connection to better servers

Future Work
Results with a Single Client
Design and evaluate intermediate binding schemes
which allows connection migration, while
considering the global implications of switching
servers by many clients.
Despite the overhead of migration, Continuous
Binding is able to improve performance when the
connection is long-lived.