@Parameters
  public static Collection<Object[]> data() {
    Object[][] balancers =
      new String[][] { { "org.apache.hadoop.hbase.master.balancer.SimpleLoadBalancer" },
        { "org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer" } };
    return Arrays.asList(balancers);
  }
Test whether region re-balancing works. (HBASE-71) The test only works for cluster wide
balancing, not per table wide. Increase the margin a little to make StochasticLoadBalancer result
acceptable.
hbase-server/src/test/java/org/apache/hadoop/hbase/TestRegionRebalancing.java