@Override
  protected void chore() {
    try {
      if (LOG.isTraceEnabled()) {
        LOG.trace("Refreshing space quotas in RegionServer");
      }
      long start = System.nanoTime();
      _chore();
      if (metrics != null) {
        metrics.incrementQuotaObserverTime((System.nanoTime() - start) / 1_000_000);
      }
    } catch (IOException e) {
      LOG.warn("Failed to process quota reports and update quota state. Will retry.", e);
    }
  }
Reads the currently received Region filesystem-space use reports and acts on those which violate
a defined quota.
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/QuotaObserverChore.java