with multiple cells per data center. Even
though Google has worked around the issue this case underscores
the importance of scalability and the limitation of assigning different
levels of responsibility in any distributed system that is
expected to scale. The biggest weakness in this system that, the
Master can be the single point of failure. However, this can be overcome
by replicating the master state. The ‘‘Shadow Masters’’ can
provide read-only access in the absence of primary master.