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https://issues.apache.org/jira/browse/QPID-3157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Gemmell updated QPID-3157:
---------------------------------
Affects Version/s: (was: 0.10)
Fix Version/s: (was: 0.11)
0.10
> subscriptions 'removed' from a queue subscription list are only marked
> deleted and not actually completely removed from the list
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-3157
> URL: https://issues.apache.org/jira/browse/QPID-3157
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.5, 0.6, 0.7, 0.8, 0.9
> Reporter: Robbie Gemmell
> Priority: Blocker
> Fix For: 0.10
>
>
> subscriptions 'removed' from a queue subscription list are only marked
> deleted and not actually released from memory. As a result any memory in use
> by the now-closed subscription will not be released until the queue is
> deleted. This also holds the ServerSession in memory.
> This issue compounded when the queue has a backlog of messages and consumers
> are created, used to recieve one message, and then closed. In this scenario
> the broker sends the client as many messages as it can prefetch, leading to
> creation of up to <prefetch size, default=500> MessageTransfer commands, all
> which are recorded in the ServerSession but then left retained as
> 'unprocessed' in the closed session. This results in an explosion in the
> number of MessageTransfer commands retained in memory as each message can
> have up to <prefetch size> MessageTransfer commands associated with it before
> it is eventually consumed by a client and all of thse will also be retained
> in memory. The last effect can be combated by restricting the preftech size
> (eg appending &maxprefetch='1' to the connection url).
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