public UpgradeActionOperations setStandardOutput(String standardOutput) {
    m_standardOutput = standardOutput;
    return this;
  }
Sets the standard output which will be used by the server to display
information about what actions are being performed.

@param standardOutput
         the output which will be displayed by the upgrade process.
@return an instance of the {@link UpgradeActionOperations} with the value
        set.
ambari-server-spi/src/main/java/org/apache/ambari/spi/upgrade/UpgradeActionOperations.java