private String getPartitionClass(BlobProperties blobProperties) {
    Account account = accountService.getAccountById(blobProperties.getAccountId());
    return ClusterMapUtils.getPartitionClass(account,
        account == null ? null : account.getContainerById(blobProperties.getContainerId()), defaultPartitionClass);
  }
@param blobProperties the properties of the blob being put
@return the partition class as required by the properties
ambry-router/src/main/java/com/github/ambry/router/PutManager.java