@Override
    public int getTotalRegionHFileSizeMB(int region) {
      return 1;
    }
Data set to testCacheCost: [test][0][0] = mapping of server to number of regions it hosts
[test][region + 1][0] = server that region is hosted on [test][region + 1][server + 1] = size
of region cached on server
hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestCacheAwareLoadBalancerCostFunctions.java