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https://issues.apache.org/jira/browse/AMQ-7009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-7009.
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Resolution: Fixed
Assignee: Gary Tully
Fix Version/s: 5.16.0
Thanks for the test case and suggested fix. A little tweak to the test case to
better manage memory usage made it clear that your fix is good.
> ActiveMQ stop delivering messages
> ---------------------------------
>
> Key: AMQ-7009
> URL: https://issues.apache.org/jira/browse/AMQ-7009
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.15.4
> Reporter: Nezih BEN FREDJ
> Assignee: Gary Tully
> Priority: Critical
> Fix For: 5.16.0
>
> Attachments: MemoryMessageStore.java,
> MemoryMessageStoreQueueCursorTest.java, activemq.log
>
>
> We have a problem with ActiveMQ 5.15.4, 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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