@BeforeClass
  public static void setUp() throws Exception {
    Configuration conf = UTIL.getConfiguration();
    conf.setInt(ServerManager.WAIT_ON_REGIONSERVERS_MINTOSTART, 1);
    UTIL.startMiniCluster(1);
    UTIL.createMultiRegionTable(TABLE_NAME, CF);
  }
Confirm that we will batch region reopens when reopening all table regions. This can avoid the
pain associated with reopening too many regions at once.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/procedure/TestReopenTableRegionsProcedureBatching.java