@After
  public void tearDown() throws Exception {
    utility.shutdownMiniCluster();
  }
HBASE-19496 noticed that the RegionLoad/ServerLoad may be corrupted if rpc server reuses the
bytebuffer backed, so this test call the Admin#getLastMajorCompactionTimestamp() to invoke
HMaster to iterate all stored server/region loads.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestServerLoadDurability.java