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https://issues.apache.org/jira/browse/QPID-3835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Gemmell reassigned QPID-3835:
------------------------------------
Assignee: Keith Wall (was: Robbie Gemmell)
> [Java broker] DurableSubscriptions without a selector on 0-10 connections
> will initially be unsubscribed at reconnect following upgrade of a legacy
> message store
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-3835
> URL: https://issues.apache.org/jira/browse/QPID-3835
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker, Java Broker BDB Store
> Affects Versions: 0.14
> Reporter: Robbie Gemmell
> Assignee: Keith Wall
> Priority: Critical
> Fix For: 0.15
>
>
> DurableSubscriptions without a selector on 0-10 connections will initially be
> unsubscribed at reconnect following upgrade of a legacy message store. If an
> older broker release is upgraded to the current format, the bindings for a
> DurableSubscriptions backing queue must be modified if it previously had no
> selector, to ensure the client can correctly reconnect to the
> DurableSubscription without having the existing messages lost due to an
> unsubscribe() bring performed.
> This is because the newer clients send the server-side selector argument with
> an empty value to signfify the lack of a selector (to allow later querying if
> the selector has changed in any way when using the 0-10 client) whereas old
> clients used the complete lack of the argument to signal this. As a result,
> when determining if the selector has changed following a store upgrade from a
> legacy broker, the client would incorrectly believe it had and follow the JMS
> spec behaviour of doing an unsubscribe() before continuing, which would have
> the effect of deleting the backing queue. The bindings of such queues should
> be manipulated during the upgrade process to add the selector argument if it
> isnt already present.
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