@Override
      public Void call() throws Exception {
        try (Connection conn = getConnection()) {
          helper.writeData(tn, 3L * SpaceQuotaHelperForTests.ONE_MEGABYTE);
          return null;
        }
      }
Test class to verify that the HBase superuser can override quotas.
hbase-server/src/test/java/org/apache/hadoop/hbase/quotas/TestSuperUserQuotaPermissions.java