[jira] [Created] (AMQ-7009) ActiveMQ stop delivering messages

["Nezih BEN FREDJ (JIRA)" <ji...@apache.org>]

Nezih BEN FREDJ created AMQ-7009:
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             Summary: ActiveMQ stop delivering messages
                 Key: AMQ-7009
                 URL: https://issues.apache.org/jira/browse/AMQ-7009
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 5.13.4
            Reporter: Nezih BEN FREDJ
         Attachments: MemoryMessageStore.java, activemq.log

We have a problem with ActiveMQ 5.13.4, it stop deliver messages to clients.

This happens completely randomly and we are not able to give a test case that reproduce the problem

Activemq is configured to use the « memoryPersistenceAdapter »

 

When examining memory dumps, we identified incoherent situation in the class MemoryMessageStore that can lead to stop delivering messages. When :

- MemoryMessageStore.recoverNextMessages(...) is called

- « lastBatchId » is not null

- « messageTable » does not contains any entry with « lastBatchId » as key

no messages are recovered

 

We added logs to try to understand how it is possible to have a non null « lastBatchId » and «  messageTable » with no entry having « lastBatchId » as key.

 

We noticed that the method setBatch is called with a non null « messageId » parameter, but no message with this id is inserted in « messageTable ». After that, when the method MemoryMessageStore.recoverNextMessages(...) is called, it does nothing and no messages are recoverd. And the system go in a what looks like an endless loop.

 

We are testing a temporary solution by resetting « lastBatchId » to null when the incoherent situation is detected.

 

Can you help us resolving the problem at the source and not just get around.

I joined modified source code of the class MemoryMessageStore and an extract of the log file.



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