private void decrementMinRegionServerCount(Configuration conf) {
    int currentCount = conf.getInt(ServerManager.WAIT_ON_REGIONSERVERS_MINTOSTART, -1);
    if (currentCount != -1) {
      conf.setInt(ServerManager.WAIT_ON_REGIONSERVERS_MINTOSTART, Math.max(currentCount - 1, 1));
    }
  }
Expire a region server's session
@param index which RS
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java