Field Detail

• cluster

  protected BaseLoadBalancer.Cluster cluster

Constructor Detail

• StochasticLoadBalancer.CostFunction

  public StochasticLoadBalancer.CostFunction(org.apache.hadoop.conf.Configuration c)

Method Detail

• regionMoved

  protected void regionMoved(int region,
                 int oldServer,
                 int newServer)

• cost

  protected abstract double cost()

• costFromArray

  protected double costFromArray(double[] stats)

  Function to compute a scaled cost using DescriptiveStatistics. It assumes that this is a zero sum set of costs. It assumes that the worst case possible is all of the elements in one region server and the rest having 0.

  Parameters:

  stats - the costs

  Returns:

  a scaled set of costs.

• scale

  protected double scale(double min,
             double max,
             double value)

  Scale the value between 0 and 1.

  Parameters:

  min - Min value

  max - The Max value

  value - The value to be scaled.

  Returns:

  The scaled value.