Constructor Detail

• StochasticLoadBalancer.CandidateGenerator

  StochasticLoadBalancer.CandidateGenerator()

Method Detail

• generate

  abstract BaseLoadBalancer.Cluster.Action generate(BaseLoadBalancer.Cluster cluster)

• pickRandomRegion

  protected int pickRandomRegion(BaseLoadBalancer.Cluster cluster,
                     int server,
                     double chanceOfNoSwap)

  From a list of regions pick a random one. Null can be returned which StochasticLoadBalancer.balanceCluster(Map) recognize as signal to try a region move rather than swap.

  Parameters:

  cluster - The state of the cluster

  server - index of the server

  chanceOfNoSwap - Chance that this will decide to try a move rather than a swap.

  Returns:

  a random HRegionInfo or null if an asymmetrical move is suggested.

• pickRandomServer

  protected int pickRandomServer(BaseLoadBalancer.Cluster cluster)

• pickRandomRack

  protected int pickRandomRack(BaseLoadBalancer.Cluster cluster)

• pickOtherRandomServer

  protected int pickOtherRandomServer(BaseLoadBalancer.Cluster cluster,
                          int serverIndex)

• pickOtherRandomRack

  protected int pickOtherRandomRack(BaseLoadBalancer.Cluster cluster,
                        int rackIndex)

• pickRandomRegions

  protected BaseLoadBalancer.Cluster.Action pickRandomRegions(BaseLoadBalancer.Cluster cluster,
                                                  int thisServer,
                                                  int otherServer)

• getAction

  protected BaseLoadBalancer.Cluster.Action getAction(int fromServer,
                                          int fromRegion,
                                          int toServer,
                                          int toRegion)