public UserQuotaState getUserQuotaState(final UserGroupInformation ugi) {
    return computeIfAbsent(userQuotaCache, getQuotaUserName(ugi),
      () -> QuotaUtil.buildDefaultUserQuotaState(rsServices.getConfiguration(), 0L));
  }
Returns the QuotaState associated to the specified user.
@param ugi the user
@return the quota info associated to specified user
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/QuotaCache.java