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From artnaseef <>
Subject Re: Selective consuming of priority messages with message groups
Date Mon, 14 Dec 2015 18:11:01 GMT
There are two things that happen with message groups that makes them a poor
match for use with selectors.

First, the default implementation of message groups uses "buckets" of
assignments for groups-to-consumers.  This means that multiple groups
actually get assigned to the same consumer because the group name shares the
same hash.  SO, it is entirely possible to have a message group assigned to
a consumer whose selector does not match.

Second, even if that were not the case, all messages within a single group
are dedicated to a single consumer, based on the group name.  Any messages
that do not match that consumers selector but are in the same group will sit
unconsumed, filling up the max-page-size limit (defaults to 200).

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