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  1. AMQ Broker
  2. ENTMQBR-2327

Divert With Wildcard Results In Duplicate Message Delivery / Poison Acks in Clustered Broker Environment

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      Example broker.xml for 3-broker cluster attached.

      • Configure a 2-broker cluster with the attach configuration as a template
      • Connect a consumer to one node of the cluster on the TEST.IN address
      • Connect a producer to the other node of the cluster and produce 10 messages to the A.TEST.IN address

      Rather than the expected 10 messages, the broker attempts to route 20 messages to the TEST.IN address, resulting in duplicates / poison acks.

      Note: This does not occur in a single-node environment.

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      Example broker.xml for 3-broker cluster attached. Configure a 2-broker cluster with the attach configuration as a template Connect a consumer to one node of the cluster on the TEST.IN address Connect a producer to the other node of the cluster and produce 10 messages to the A.TEST.IN address Rather than the expected 10 messages, the broker attempts to route 20 messages to the TEST.IN address, resulting in duplicates / poison acks. Note: This does not occur in a single-node environment.

    Description

      Consider a broker in a cluster configured with the following divert policy:

            <addresses>
         <address name="DLQ">
            <anycast>
               <queue name="DLQ" />
            </anycast>
         </address>
         <address name="ExpiryQueue">
            <anycast>
               <queue name="ExpiryQueue" />
            </anycast>
         </address>
         <address name="TEST.IN">
            <anycast>
               <queue name="TEST.IN"/>
            </anycast>
         </address>
         <address name="A.TEST.IN">
            <anycast>
               <queue name="A.TEST.IN"/>
            </anycast>
         </address>

      </addresses>

      <diverts>
        <divert name="TEST">
                <routing-name>TEST-divert</routing-name>
                <address>*.TEST.IN</address>
                <forwarding-address>TEST.IN</forwarding-address>
                <exclusive>true</exclusive>
        </divert>
      </diverts>

      With a standalone broker instance, sending 10 messages to the A.TEST.IN address correctly results in 10 messages forwarded to TEST.IN and 10 dequeues to the consumer listening on that address.

      When the broker is clustered, the same policy added to one or both the clustered brokers results in 20 forwards from A.TEST.IN to TEST.IN and duplicate messages / poison acknowledgements at the client.

      Adding explicit wildcard address configuration did not seem to change the behavior:

            <wildcard-addresses>
         <routing-enabled>true</routing-enabled>
         <delimiter>.</delimiter>
         <any-words>#</any-words>
         <single-word>*</single-word>
      </wildcard-addresses>

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          duplicates

          Task - Represents a small unit of work that is not end-user facing. ENTMQBR-2270 Message Duplication when using exclusive divert and clustering

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

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              rh-ee-ataylor Andy Taylor
              rhn-support-dhawkins Duane Hawkins
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                Updated:
                Resolved: