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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (QPID-4263) HA broker can crash due to priority queue corruption
Date Fri, 07 Sep 2012 20:06:07 GMT

    [ https://issues.apache.org/jira/browse/QPID-4263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450928#comment-13450928
] 

Alan Conway edited comment on QPID-4263 at 9/8/12 7:05 AM:
-----------------------------------------------------------

MessageDeque::setPosition only erases messages *after* the position. According to the precondition
for setPosition, there cannot be any un-deleted messages after the position so this is OK.
                
      was (Author: aconway):
    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
>            Assignee: Alan Conway
>
> 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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