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# Message Delivery Behavior

## Duplicate Delivery

While persistence stores and durables can strengthen delivery assurance, they also introduce the possibility of duplicate delivery. Application developers must design subscribing programs to process duplicate messages gracefully.

## Message Order

A persistence store preserves message order within each of its publisher streams. That is, if a publisher sent message M1 before message M2, then the store delivers M1 before M2. Every subscriber that attempts to recover both messages receives them in the correct order.

However, a persistence store that merges message streams from two or more publishers does not preserve global order among its publisher streams. That is, if publisher A sent message A1 before publisher B sent message B2, the store could deliver these messages in either order. Furthermore, two subscribers S and T that recover these two messages could receive them in a different order: S receiving A1 first, and T receiving B2 first.

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