franz1981 edited a comment on issue #2975: ARTEMIS-2617 Improve AMQP Journal loading URL: https://github.com/apache/activemq-artemis/pull/2975#issuecomment-583875806 @michaelandrepearce I suppose you are interested in numbers: in my syntethic tests a 2 GB journal with very small messages (to create tons of garbage due to the infrastructure of messages) wasn't able to be loaded by a broker with `4GB` heap size, always leading to a OOM: now it can be loaded without relevant GC pauses eg  We're not quite yet at the same level of Core messages, but very near: I think that the duplicate `address` is responsible of the difference here. The commit that allows to half-brute force search `x-opt-delivery-time` is what I'm not sure about: - that method should be optimized and performed optimally by proton itself IMO (nudge nudge @tabish121 @gemmellr), but I would be super happy to provide a PR for it - currently it can give rare false positive (causing message scanning when not necessary) - I've yet to verify how it behave with many message annotations and longer messages If @michaelandrepearce has some real journal to test with and compare with `master` it would be great, given that this change can affect positively your usage of the broker ;)
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