Consider the FireAlarm example as written using JGroups. Suppose this was generalized to support a variety of alarm types, such as fire, flood, intrusion and so on. What are the requirements of this application in terms of reliability and ordering?
What will be an ideal response?
As these are all critical messages, the key requirement is for reliable multicast in terms of integrity, validity and agreement. Ordering is less of an issue in this example as there is no strong need to preserve ordering across alarm types. Similarly, this application is quite simple and there is no concept of a sequence of messages relating to a given alarm, for example alarm raised, alarm being dealt with, alarm dealt with. If this added sophistication was introduced into the example, then causal ordering would be required.
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