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Date: Mon, 11 Aug 2014 19:46:13 +0000 (UTC)
From: "Ulrich Romahn (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Message-ID: <JIRA.12733326.1407786333293.57581.1407786373146@arcas>
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References: <JIRA.12733326.1407786333293@arcas>
Subject: [jira] [Created] (AMQ-5319) Message Redelivery Does Not Work As
 Expected With Concurrent Connections
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Ulrich Romahn created AMQ-5319:
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             Summary: Message Redelivery Does Not Work As Expected With Concurrent Connections
                 Key: AMQ-5319
                 URL: https://issues.apache.org/jira/browse/AMQ-5319
             Project: ActiveMQ
          Issue Type: Bug
          Components: JMS client
    Affects Versions: 5.9.0
         Environment: All
            Reporter: Ulrich Romahn


The redelivery of messages does not work as expected when a message daemon is connected using multiple parallel connections.

Consider the following scenario:
1. A message daemon is using Spring's org.springframework.jms.listener.DefaultMessageListenerContainer and configuring it with the following parameters:
  a: cacheLevel = CACHE_NONE
  b: concurrentConsumers = 5
  c: maxConcurrentConsumers = 5
  d: sessionTransacted = true
2. Furthermore, we are using the org.apache.activemq.pool.PooledConnectionFactory with the following configuration:
  a: createConnectionOnStartup = true
  b: maxConnections = 5
We also setup a RedeliveryPolicy on the ConnectionFactory allowing messages to get re-delivered to the listener in case of an error.

Once the DefaultMessageListenerContainer gets initialized by the Spring context, it will create 5 instances of a corresponding MessageListener implementation each getting its own exclusive connection pre-created and obtained from the ConnectionPool. Our message daemon is now connected to the broker using five concurrent connections.

If one of the MessageListener has an error during processing of a message and throws an exception, the message gets put back onto the queue (on the client) and scheduled for re-delivery according to the policy. However, the same message is getting delivered to another listener using a different connection. Since the thread running the redelivery scheduler is bound to a connection, the second delivery is not delayed according to the redelivery policy. A likely failure in that listener will get the message put back onto the queue again and scheduled for re-delivery, but bound to that connection. Now, that same message will get delivered to yet another message listener without the defined delay. This will continue until the message got redelivered by each connection and will then be redelivered using a delay specified by the policy. In case the retry count is less than the number of connections, the message will get send to the DLQ.

I observe the same behavior when using broker-side redelivery using the RedeliveryPlugin since there the delay is also bound to a connection.

However, the re-delivery delay should be globally per message, regardless  of session or connection. Although this is not a standardized feature, the current implementation is severely limited as described above which caused me to define this a bug.


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