void initStorageUsage(Map<String, Map<String, Long>> usage) {
    logger.info("Initializing storage usage for {} accounts", usage.size());
    storageUsages = new ConcurrentHashMap<>();
    initMap(usage, storageUsages);
  }
Initialize the storage usage from the given map.
@param usage The map that contains storage usage for containers.
ambry-quota/src/main/java/com/github/ambry/quota/storage/StorageQuotaEnforcer.java