MRG 3 Overview

1. The Top Six Differences between MRG Messaging 2 and 3
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These are the most significant differences between MRG 2 and MRG 3:

The broker and the C++ messaging library (qpid::messaging) now offer amqp1.0 support via the Apache Proton library (note that transactions are not yet available over amqp1.0).
Clustering has been replaced with a new High Availability implementation.
Queue Threshold alerts are now edge-triggered, rather than level-triggered. This improves alert rate limiting.
The flow-to-disk implementation has been changed to disk-paged queues to more efficiently use memory.
The ring-strict limit policy has been dropped.
The messaging journal has been replaced with a new implementation - the dynamically-expanding Linear Store.

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