Sunday, November 28, 2010

reliable JMS in various configurations

Simple Rule: In both queues and topics, I believe expiration setting overrides every delivery guarantee, including Durable sub. Idea is, sender knows its OK to drop a pending message after its useful life. See P101, 104[[JMS]]

Simple Rule: In both queues and topics, durable or not, non-persistent messages are always at risk to get lost[2] , so reliability is always below 100% -- P102 [[JMS]]

[2] if broker acknowledges receipt to sender, then goes down, with the message. Persistent Messages are persisted before broker sends ack to sender, and sender method returns. Without receiving the ack, sender blocks for some time and throws an exception.

As we go though different configurations below, we will realize 100% reliability requires multiple conditions. Each missing condition can break 100% reliability.

- durable, persistent message without expiration? guaranteed
-- same config but nonpersistent? not reliable
-- same config with expiration? will expire

- p2p, persistent message without expiry, but a disconnected receiver? guaranteed -- consider the SIM upfront queue.
-- same config with expiry? will expire

- disconnected non-durable subscriber? won't receive
- connected non-durable subscriber, persistent message without expiration? best-effort. I believe broker will attempt delivery. If client disconnects before sending ack, broker may give up.



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