[jira] [Created] (AMQ-5875) Removing a destination when using mKahaDB can cause an IllegalStateException

["Christopher L. Shannon (JIRA)" <ji...@apache.org>]

Christopher L. Shannon created AMQ-5875:
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             Summary: Removing a destination when using mKahaDB can cause an IllegalStateException
                 Key: AMQ-5875
                 URL: https://issues.apache.org/jira/browse/AMQ-5875
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.11.1
            Reporter: Christopher L. Shannon
         Attachments: MultiKahaDBDeletionTest.java

This issue occurs when using multiKahaDB and a wild card destination.  The problem is that with a wild card topic, multiple destinations can be attached to the same store.  If one of the destinations is deleted and the other destinations are empty, the entire store is deleted.  This causes an exception later on if trying to do something like subscribe to a destination that wasn't deleted.  I've attached a test case to show this issue.  

The problem seems to be that the removeMessageStore method in MultiKahaDBPersistenceAdapter relies on adapter.getDestinations.isEmpty() to determine whether the store is eligible for deleting.  Unfortunately, the getDestinations method in KahaDBStore excludes destinations that are empty therefore the method doesn't return any destinations even though there is one still attached to the store so the logic goes ahead and deletes the store.

The stack trace from running against 5.12.0-SNAPSHOT is below:

{noformat}
java.lang.IllegalStateException: PageFile is not loaded
        at org.apache.activemq.store.kahadb.disk.page.PageFile.assertLoaded(PageFile.java:811)
        at org.apache.activemq.store.kahadb.disk.page.PageFile.tx(PageFile.java:304)
        at org.apache.activemq.store.kahadb.KahaDBStore$KahaDBTopicMessageStore.getMessageCount(KahaDBStore.java:866)
        at org.apache.activemq.store.ProxyTopicMessageStore.getMessageCount(ProxyTopicMessageStore.java:140)
        at org.apache.activemq.store.ProxyTopicMessageStore.getMessageCount(ProxyTopicMessageStore.java:140)
        at org.apache.activemq.broker.region.cursors.TopicStorePrefetch.getStoreSize(TopicStorePrefetch.java:97)
        at org.apache.activemq.broker.region.cursors.AbstractStoreCursor.resetSize(AbstractStoreCursor.java:73)
        at org.apache.activemq.broker.region.cursors.TopicStorePrefetch.<init>(TopicStorePrefetch.java:58)
        at org.apache.activemq.broker.region.cursors.StoreDurableSubscriberCursor.add(StoreDurableSubscriberCursor.java:119)
        at org.apache.activemq.broker.region.PrefetchSubscription.add(PrefetchSubscription.java:584)
        at org.apache.activemq.broker.region.DurableTopicSubscription.add(DurableTopicSubscription.java:113)
        at org.apache.activemq.broker.region.Topic.addSubscription(Topic.java:161)
        at org.apache.activemq.broker.region.AbstractRegion.addConsumer(AbstractRegion.java:400)
        at org.apache.activemq.broker.region.TopicRegion.addConsumer(TopicRegion.java:168)
        at org.apache.activemq.broker.region.RegionBroker.addConsumer(RegionBroker.java:427)
        at org.apache.activemq.broker.jmx.ManagedRegionBroker.addConsumer(ManagedRegionBroker.java:244)
        at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:102)
        at org.apache.activemq.advisory.AdvisoryBroker.addConsumer(AdvisoryBroker.java:107)
        at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:102)
        at org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:102)
        at org.apache.activemq.broker.MutableBrokerFilter.addConsumer(MutableBrokerFilter.java:107)
        at org.apache.activemq.broker.TransportConnection.processAddConsumer(TransportConnection.java:667)
        at org.apache.activemq.command.ConsumerInfo.visit(ConsumerInfo.java:348)
        at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:334)
        at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:188)
        at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)
        at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:113)
        at org.apache.activemq.transport.AbstractInactivityMonitor.onCommand(AbstractInactivityMonitor.java:300)
        at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
        at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:214)
        at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:196)
        at java.lang.Thread.run(Thread.java:745)
{noformat}



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