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https://issues.apache.org/activemq/browse/AMQ-1940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=50856#action_50856
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Loc Truong commented on AMQ-1940:
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I can reproduct this in 5.2.0. This happens to me because there are too many
receivers, each of them try to recevie 500 messages but the total messages in
queue is smaller, hence negative number.
> Negative queue size (reproducible)
> ----------------------------------
>
> Key: AMQ-1940
> URL: https://issues.apache.org/activemq/browse/AMQ-1940
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.2.0
> Environment: Found on Windows but reproduced under Linux
> Reporter: Vadim Chekan
> Assignee: Rob Davies
> Priority: Critical
> Fix For: 5.2.0
>
> Attachments: Main.java, Picture 6.png, QueuePurgeTest.java.diff.txt
>
>
> When you "purge" queue from web admin console, it zeroes queue message
> counter. But if you have an active consumer at that time which
> pre-fetched messages than your consumer will keep sending ack as it
> process messages from its buffer. ActiveMQ will keep decrement counter
> upon receiving each ack. So when consumer is done queue will show
> MINUS<consumer buffer size>.
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