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Posted to dev@qpid.apache.org by "Alan Conway (JIRA)" <ji...@apache.org> on 2012/09/07 22:04:07 UTC
[jira] [Commented] (QPID-4263) HA broker can crash due to priority
queue corruption
[ https://issues.apache.org/jira/browse/QPID-4263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450928#comment-13450928 ]
Alan Conway commented on QPID-4263:
-----------------------------------
MessageDeque::setPosition(n) only erases messages *after* n. According to the precondition for setPosition, there cannot be any un-deleted messages after n so this is OK.
> HA broker can crash due to priority queue corruption
> ----------------------------------------------------
>
> Key: QPID-4263
> URL: https://issues.apache.org/jira/browse/QPID-4263
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Affects Versions: 0.18
> Reporter: Jason Dillaman
>
> Similar to QPID-4262 and discovered via code review while investigating the other issue, it appears that it is possible for the priority queue's "messages" deques to become out-of-sync with their backing "fifo" deque if "PriorityQueue::setPosition" is invoked. That method will delete messages from the backing MessageDeque collection without removing the pointers to the deleted messages from the PriorityQueue.
> The HA and replication plugins can both invoke this method on a queue.
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