protected void forceBalancer() throws Exception {
    Admin admin = this.context.getHBaseIntegrationTestingUtility().getAdmin();
    boolean result = false;
    try {
      result = admin.balance();
    } catch (Exception e) {
      getLogger().warn("Got exception while doing balance ", e);
    }
    if (!result) {
      getLogger().error("Balancer didn't succeed");
    }
  }
Returns current region servers - active master
hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/actions/Action.java