[jboss-jira] [JBoss JIRA] Commented: (JBMESSAGING-1456) Messages stuck in being-delivered state in cluster

[Howard Gao (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBMESSAGING-1456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12453403#action_12453403 ] 

Howard Gao commented on JBMESSAGING-1456:
-----------------------------------------

The reason the message got stuck:

1. Message A arrived at Queue on node0.
2. Client creates conn1/sess1/cons1 to receive messages.
3. Message A is delivered to cons1, but the message delivery failed at remoting layer due to timeout. So node0 will mark this cons1 dead and deliver messages to other consumers. However the timeout didn't cause the remoting to think of the connection being broken (maybe the connection was just occasionally slow), so JBM node0 didn't get connection failure notification, therefore the conn1/sess1/cons1 at the server node0 were not cleared (that means message A was not put back to queue for re-delivery).
4. before client closes conn1/sess1/cons1, client ping timout happened and it will trigger client side failover. The result is that internally a new connection to node1 (conn2/sess2/cons2) was created. To client this happened transparently, so it looks like messages continue coming in to the same consumer, but internally the consumer has changed.
5. client tried to close conn1/sess1/cons1 (actually it is closing conn2/sess2/cons2 now). node1 will close conn2/sess2/cons2 accordingly.
6. client created another set of conn/sess/cons and continue to work.
7. at this point, the conn1/sess1/cons1 at the server side keep open, so the message A will never be put back into queue, so stuck.
8. The message A will get redelivered if a) we shut down the client process and restart the client; or b) we shutdown the server node0 and restart the node0.



> Messages stuck in being-delivered state in cluster
> --------------------------------------------------
>
>                 Key: JBMESSAGING-1456
>                 URL: https://jira.jboss.org/jira/browse/JBMESSAGING-1456
>             Project: JBoss Messaging
>          Issue Type: Bug
>    Affects Versions: 1.4.0.SP3_CP03
>            Reporter: Justin Bertram
>            Assignee: Howard Gao
>            Priority: Critical
>         Attachments: kill3_thread_dump.txt, thread_dump.txt
>
>
> Messages become "stuck" in being-delivered state when clients use a clustered XA connection factory in a cluster of at least 2 nodes.
> JBoss setup:
>   -2 nodes of JBoss EAP 4.3 CP02
>   -commented out "ClusterPullConnectionFactory" in messaging-service.xml to prevent message redistribution and eliminate the "message suckers" as the potential culprit
>   -MySQL backend using the default mysql-persistence-service.xml (from <JBOSS_HOME>/docs/examples/jms)
> Client setup:
>   -both nodes have a client which is a separate process (i.e. not inside JBoss)
>   -clients are Spring based
>   -one client produces and consumes, the other client just consumes
>   -both clients use the ClusteredXAConnectionFactory from the default connection-factories-service.xml
>   -both clients publish to and consume from "queue/testDistributedQueue"
>   -clients are configured to send persistent messages, use AUTO_ACKNOWLEDGE, and transacted sessions
> Symptoms of the issue:
>   -when running the clients I watch the JMX-Console for the "queue/testDistributedQueue"
>   -as the consumers pull messages off the queue I can see the MessageCount and DeliveringCount go to 0 every so often
>   -after a period of time (usually a few hours) the MessageCount and DeliveringCount never go back to 0
>   -I "kill" the clients and wait for the DeliveringCount to go to 0, but it never does
>   -after the clients are killed the ConsumerCount for the queue will drop, but never to 0 when messages are "stuck"
>   -a thread dump reveals at least one JBM server session that is apparently stuck (it never goes away) - ostensibly this is the consumer that is showing in the JMX-Console for "queue/testDistributedQueue"
>   -a "killall -3 java" doesn't produce anything from the clients so I know their dead
>   -nothing is in any DLQ or expiry queue
>   -the database contains as many rows in the JBM_MSG and JBM_MSG_REF tables as the DeliveringCount in the JMX-Console
>   -rebooting the node with the stuck messages frees the messages to be consumed (i.e. un-sticks them)
> Other notes:
>   -nothing else is happening on either node but running the client and running JBoss
>   -this only appears to happen when a clustered connection factory is used.  I tested using a normal connection factory and after 24 hours couldn't reproduce a stuck message.

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