private static String getUserNameFromEncryptionKey(DataEncryptionKey encryptionKey) {
    return encryptionKey.keyId + NAME_DELIMITER + encryptionKey.blockPoolId + NAME_DELIMITER
      + Base64.getEncoder().encodeToString(encryptionKey.nonce);
  }
Create a ByteString from byte array without copying (wrap), and then set it as the payload
for the builder.
@param builder builder for HDFS DataTransferEncryptorMessage.
@param payload byte array of payload.
hbase-asyncfs/src/main/java/org/apache/hadoop/hbase/io/asyncfs/FanOutOneBlockAsyncDFSOutputSaslHelper.java