Thursday, January 27, 2011

message overflow in various MOM configurations

Message overflow is a frequent headache in MOM. Basically consumption rate (possibly 0) is slower than production rate, eating up storage capacity, either in memory or on disk.

eg: Topic with NDS (non-durable-subscriber) only -- almost free of overflow. Bonnie said broker will discard. Jerry said broker keeps track of alive subscribers. Every incoming message is guaranteed to be delivered (by retry) to each. Broker must persist pending messages. When a subscribe disconnects gracefully, broker no longer needs to keep any pending message for her.

eg: queue. While any number of producers can send messages to the queue, each message is guaranteed to be delivered, and consumed by one consumer. If no consumers are registered to consume the messages, the queue holds (on disk) them until a consumer registers to consume them.

eg: temp queue??
eg: chatrooms don't persist data but what type of MOM is that? probably NDS topic
eg: tibrv non-CM? market data feed? Discarded but how soon? 60 sec by default?
Yes, in slow consume and fast producer scenario message lost will be possible -- http://arun-tibco.blogspot.com/2010/09/tibco-rv-faqs.html

eg: tibrv CM? Storage is the ledger file. --persist--
eg: regular queue? In SIM upfront, unread messages --persist--
eg: mailing list (topic with durable subscribers)? --Persist--
eg: topic without durable subscriber? see post on message retention

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