protected static boolean isExceedThrottleQuotaEnabled(final Connection connection)
    throws IOException {
    Get get = new Get(getExceedThrottleQuotaRowKey());
    get.addColumn(QUOTA_FAMILY_INFO, QUOTA_QUALIFIER_SETTINGS);
    Result result = doGet(connection, get);
    if (result.isEmpty()) {
      return false;
    }
    return Bytes.toBoolean(result.getValue(QUOTA_FAMILY_INFO, QUOTA_QUALIFIER_SETTINGS));
  }
Returns true if the support for quota is enabled
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/QuotaUtil.java