public synchronized void stop() {
    if (spaceQuotaRefresher != null) {
      spaceQuotaRefresher.shutdown();
      spaceQuotaRefresher = null;
    }
    if (regionSizeReporter != null) {
      regionSizeReporter.shutdown();
      regionSizeReporter = null;
    }
    started = false;
  }
A manager for filesystem space quotas in the RegionServer. This class is the centralized point
for what a RegionServer knows about space quotas on tables. For each table, it tracks two
different things: the {@link SpaceQuotaSnapshot} and a {@link SpaceViolationPolicyEnforcement}
(which may be null when a quota is not being violated). Both of these are sensitive on when they
were last updated. The {link SpaceQutoaViolationPolicyRefresherChore} periodically runs and
updates the state on <code>this</code>.
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/RegionServerSpaceQuotaManager.java