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Posted to dev@qpid.apache.org by "Philip Harvey (JIRA)" <ji...@apache.org> on 2012/05/11 11:37:50 UTC
[jira] [Assigned] (QPID-3979) Last value queue memory leak
[ https://issues.apache.org/jira/browse/QPID-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Philip Harvey reassigned QPID-3979:
-----------------------------------
Assignee: Philip Harvey
> Last value queue memory leak
> ----------------------------
>
> Key: QPID-3979
> URL: https://issues.apache.org/jira/browse/QPID-3979
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.12, 0.14, 0.16, 0.17
> Reporter: Philip Harvey
> Assignee: Philip Harvey
>
> I have observed a memory leak when using a last value queue.
> Upon investigation, it seems that this is due to a bug in the management of ConflationQueueList._latestValuesMap. This map is keyed by the configured conflation key. Whilst entries are correctly replaced when new messages arrive, they are never *deleted*. Therefore, an entry remains in the map for every key value that has ever existed.
> The problem is compounded by the fact that the retained ConflationQueueEntry's can reference other entries - that is how the linked list behaviour of the queue list is achieved. Therefore, retaining a single entry in the aforementioned map can cause a large number of other entries to remain in memory.
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