[ https://issues.apache.org/activemq/browse/AMQ-1837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43905#action_43905 ] 

Jan Wiemer commented on AMQ-1837:
---------------------------------

By the way I used: {{apache-activemq-5.2-20080619.135742-2-bin.zip}}

> Lost messages after broker recovery
> -----------------------------------
>
>                 Key: AMQ-1837
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1837
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Message Store
>    Affects Versions: 5.1.0
>            Reporter: Jan Wiemer
>            Priority: Critical
>         Attachments: src.zip
>
>
> We experienced that some messages (send in persistent mode) were lost after the message broker was killed and restarted.
> The attached little test simulates the situation:
> There are 10 queues, 10 sender and 10 receiver threads each sending / receiving quite frequently to / from one queue for a quite long time.
> The receiver for each queue expects the messages exactly in the order the sender has send the messages.
> After restarting (killing) the broker the order of the received messages gets disturbed or messages get lost. 
> * Start the broker as configures by default in the distribution (only switch on JMX support). 
> * Start the main method of the attached class
> * Wait until some messages are received
> * kill or shutdown the broker
> * restart the broker
> * have a look at the output of the test class
> {code:title=Output}
> Exception in ReceiverThread: java.lang.RuntimeException: Received unexpected message! Expected: QUEUE-4: #3197, Received: QUEUE-4: #3267
> {code}
> {code:title=Broker Output}
> ...
> INFO  BrokerService                  - Using Persistence Adapter: AMQPersistenceAdapter(D:\sandbox\Experimental\Activemq\apache-activemq-5.2-SNAPSHOT\bin\..\data)
> INFO  AMQPersistenceAdapter          - AMQStore starting using directory: D:\sandbox\Experimental\Activemq\apache-activemq-5.2-SNAPSHOT\bin\..\data
> INFO  KahaStore                      - Kaha Store using data directory D:\sandbox\Experimental\Activemq\apache-activemq-5.2-SNAPSHOT\bin\..\data\kr-store\state
> INFO  AMQPersistenceAdapter          - Active data files: []
> WARN  AMQPersistenceAdapter          - The ReferenceStore is not valid - recovering ...
> INFO  KahaStore                      - Kaha Store successfully deleted data directory D:\sandbox\Experimental\Activemq\apache-activemq-5.2-SNAPSHOT\bin\..\data\kr-store\data
> INFO  AMQPersistenceAdapter          - Journal Recovery Started from: DataManager:(data-)
> INFO  KahaStore                      - Kaha Store using data directory D:\sandbox\Experimental\Activemq\apache-activemq-5.2-SNAPSHOT\bin\..\data\kr-store\data
> INFO  AMQPersistenceAdapter          - Recovered 198261 operations from redo log in 18.028 seconds.
> INFO  AMQPersistenceAdapter          - Finished recovering the ReferenceStore
> INFO  BrokerService                  - ActiveMQ 5.2-SNAPSHOT JMS Message Broker (localhost) is starting
> ...
> {code}

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