@Override
    public String toString() {
      String toStr = String.format("(%s/%s)", containerName, blobFilePath);
      return toStr;
    }
@param containerName Name of the Azure storage container.
@param blobFilePath Name of the file path for the blob within the container.
ambry-cloud/src/main/java/com/github/ambry/cloud/azure/AzureBlobLayoutStrategy.java