public Map<TableName, SpaceQuotaSnapshot> copyQuotaSnapshots() {
    return new HashMap<>(currentQuotaSnapshots.get());
  }
Copies the last {@link SpaceQuotaSnapshot}s that were recorded. The current view of what the
RegionServer thinks the table's utilization is.
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/RegionServerSpaceQuotaManager.java