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https://issues.apache.org/jira/browse/QPID-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775384#action_12775384
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Rob Godfrey commented on QPID-2193:
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To be fair, if you have a full understanding of the dynamic environment in
which the queue resides then deleting the first message from (head of the)
queue is perfectly safe. It is only unsafe if the queue contents are changing
in ways you cannot predict while you perform the operation.
A better analogy might be that previously we allowed you to take aim but don't
protect you from involuntary movements of your foot placing your toes in the
line of fire immediately before you pulled the trigger. versions after 0.6
allow for an automatic targeting system which is guaranteed to avoid podiatric
injury.
> Allow deleting the first message on a queue through the JMX Management
> Console when connected to older brokers
> ---------------------------------------------------------------------------------------------------------------
>
> Key: QPID-2193
> URL: https://issues.apache.org/jira/browse/QPID-2193
> Project: Qpid
> Issue Type: New Feature
> Components: Java Management : JMX Console
> Affects Versions: 0.6
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Priority: Minor
> Fix For: 0.6
>
>
> Java brokers previous to 0.6 do not support deletion of arbitrary messages,
> only the 'first message on the queue' at any given time. This was not exposed
> in the updated console due for release with 0.6 (where the broker now does
> support deletion of arbitrary messages). This decision was made because by
> its very nature the method cannot guarantee which message would be deleted
> when it is executed, as any queue activity could alter which message is at
> the head of the queue. However, users may have come to expect this method to
> be present, and so it should be exposed for older brokers that lack the
> ability to exactly specify which messages should be deleted.
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