[jira] [Resolved] (ARTEMIS-2276) Deadlock between QueueImpl and TransactionImpl

["Frederik Petersen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARTEMIS-2276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Frederik Petersen resolved ARTEMIS-2276.
----------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.7.0

Yes, it seems to be working. We didn't experience an issue with dead locks again.

> Deadlock between QueueImpl and TransactionImpl
> ----------------------------------------------
>
>                 Key: ARTEMIS-2276
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-2276
>             Project: ActiveMQ Artemis
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 2.6.4
>            Reporter: Frederik Petersen
>            Priority: Major
>             Fix For: 2.7.0
>
>         Attachments: artemis_thread_dump_2.log
>
>
> Hi,
> we just experienced another deadlock in artemis.
> I am attaching the thread dump. The issue seems to be here:
>  
> {code:java}
> "Thread-0 (activemq-netty-threads)" Id=43 BLOCKED on org.apache.activemq.artemis.core.transaction.impl.TransactionImpl@196f00e1 owned by "Thread-7 (ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$5@5bda80bf)" Id=87
>  at org.apache.activemq.artemis.core.server.impl.QueueImpl.getRefsOperation(QueueImpl.java:1332)
>  - blocked on org.apache.activemq.artemis.core.transaction.impl.TransactionImpl@196f00e1
>  at org.apache.activemq.artemis.core.server.impl.QueueImpl.getRefsOperation(QueueImpl.java:1328)
>  at org.apache.activemq.artemis.core.server.impl.QueueImpl.acknowledge(QueueImpl.java:1295)
>  at org.apache.activemq.artemis.core.server.impl.MessageReferenceImpl.acknowledge(MessageReferenceImpl.java:207)
>  at org.apache.activemq.artemis.core.server.impl.MessageReferenceImpl.acknowledge(MessageReferenceImpl.java:199)
>  at org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl.acknowledge(ServerConsumerImpl.java:874)
>  - locked org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl@31c578da
>  at org.apache.activemq.artemis.core.server.impl.ServerSessionImpl.acknowledge(ServerSessionImpl.java:891)
>  at org.apache.activemq.artemis.core.protocol.stomp.StompSession$1.run(StompSession.java:159)
>  at org.apache.activemq.artemis.core.protocol.stomp.StompSession.afterDelivery(StompSession.java:111)
>  at org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl.proceedDeliver(ServerConsumerImpl.java:469)
>  at org.apache.activemq.artemis.core.server.impl.QueueImpl.proceedDeliver(QueueImpl.java:2936)
>  at org.apache.activemq.artemis.core.server.impl.QueueImpl.deliverDirect(QueueImpl.java:2921)
>  - locked org.apache.activemq.artemis.core.server.impl.QueueImpl@6b7ed217
> [...]
> "Thread-7 (ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$5@5bda80bf)" Id=87 BLOCKED on org.apache.activemq.artemis.core.server.impl.QueueImpl@6b7ed217 owned by "Thread-0 (activemq-netty-threads)" Id=43
>  at org.apache.activemq.artemis.core.server.impl.RefsOperation.afterCommit(RefsOperation.java:165)
>  - blocked on org.apache.activemq.artemis.core.server.impl.QueueImpl@6b7ed217
>  at org.apache.activemq.artemis.core.transaction.impl.TransactionImpl.afterCommit(TransactionImpl.java:546)
>  - locked org.apache.activemq.artemis.core.transaction.impl.TransactionImpl@196f00e1
> [...]
> {code}
>  
> Thread-0 locks QueueImpl@6b7ed217.
>  Thread-7 locks TransactionImpl@196f00e1.
>  Thread-0 waits for TransactionImpl@196f00e1.
>  Thread-7 waits for QueueImpl@6b7ed217.
> We had a few mqtt producers, stomp consumers and stomp producers. A few hundred items/sec. deliverDirect disabled on mqtt as suggested by [~clebertsuconic] here: [https://github.com/apache/activemq-artemis/pull/2577#issuecomment-472070556]
> But I guess this dead lock is not the same as the one discussed there.
> Thanks for your help.



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