@Override
    public void run() {
      try {
        Get g = new Get(ROW);
        g.addColumn(FAM_NAM, new byte[] { 0 });
        table.get(g);
      } catch (ServerTooBusyException e) {
        getServerBusyException = 1;
      } catch (IOException ignore) {
      }
    }
This class is for testing HBaseConnectionManager ServerBusyException. Be careful adding to this
class. It sets a low HBASE_CLIENT_PERSERVER_REQUESTS_THRESHOLD
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestServerBusyException.java