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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-3206) Unsubscribed durable sub can leave dangling message reference in kahaDB, visible after a restart
Date Mon, 07 Mar 2011 14:55:59 GMT
Unsubscribed durable sub can leave dangling message reference in kahaDB, visible after a restart
------------------------------------------------------------------------------------------------

                 Key: AMQ-3206
                 URL: https://issues.apache.org/jira/browse/AMQ-3206
             Project: ActiveMQ
          Issue Type: Bug
          Components: Message Store
    Affects Versions: 5.4.2
            Reporter: Gary Tully
            Assignee: Gary Tully
             Fix For: 5.5.0


Unsubscribing a durable sub with kahaDB cleans up the expected ack locations but does not
update the change to the persistent index. After a restart, the old state is recovered which
can lead to invalid references to messages. These references can block journal file deletion
when the message is ultimately consumed by all interested subs, Leading to data file build
up. The necessary conditions are multiple durable subs with some unsubscribing with a remaining
backlog along with broker restarts. 

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