Apple Qmaster 3 - Manual (Page 73)

QuickTime Reference Movies
If you submit a reference movie for distributed processing, the Apple Qmaster distributed
processing system will automatically copy the appropriate media files to the processing
cluster. For the best performance, you can avoid this file transfer step by making sure
that the media files specified in the reference movie are available to each node of the
Apple Qmaster cluster.
Defining Ports for Service Advertisements
You can define which ports Apple Qmaster uses for service advertisements with the
Enable Port Range checkbox and text fields in the Network section of the Advanced pane
within the Apple Qmaster pane of System Preferences.
To define ports for Apple Qmaster service advertisements
1 Open the Apple Qmaster pane of System Preferences.
2 Click Advanced to open the Advanced pane.
3 Select Enable Port Range.
4 In the From field, enter any integer value between 50,000 and 65,535 to set the start of
the range.
5 In the “Number of ports” field, enter the size of the range, such as 1000.
Recovery and Failure Notification Features
The Apple Qmaster distributed processing system has a number of built-in features
designed to attempt recovery if there is a problem, and to notify you when the system
attempts a recovery.
Recovery Features
The recovery actions described next occur automatically if failures occur in the
Apple Qmaster distributed processing system. There is no need for you, as the
administrator, to enable or configure these features.
If a Service Stops Unexpectedly
If either the cluster controller service or the processing enabled on a service node stops
unexpectedly, the Apple Qmaster distributed processing system restarts the service. To
avoid the risk of endless stopping and restarting, the system restarts the failed service a
maximum of four times. The first two times, it restarts the service right away. If the service
stops abruptly a third or fourth time, the system restarts the service only if it had been
running for at least 10 seconds before it stopped.
73 Chapter 6 Administering Clusters