@Override
      public GlobalQuotaSettingsImpl fetch() throws IOException {
        return new GlobalQuotaSettingsImpl(null, null, null, regionServer,
          QuotaUtil.getRegionServerQuota(masterServices.getConnection(), regionServer));
      }
Master Quota Manager. It is responsible for initialize the quota table on the first-run and
provide the admin operations to interact with the quota table. TODO: FUTURE: The master will be
responsible to notify each RS of quota changes and it will do the "quota aggregation" when the
QuotaScope is CLUSTER.
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/MasterQuotaManager.java