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https://issues.apache.org/jira/browse/AMQ-9654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17957411#comment-17957411
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Matt Pavlovich commented on AMQ-9654:
-------------------------------------
1a. Not expired
1b. Might be redelivered (working to verify)
1c. Duplicate From Store occurred
4. No, cursor cache is disabled
5. Yes, duplicate from store
6. Persistent
Log messages
{noformat}
org.apache.activemq.broker.region.cursors.QueueStorePrefetch@5a64ec82:QUEUE.IN,batchResetNeeded=false,size=4,cacheEnabled=false,maxBatchSize:4,hasSpace:true,pendingCachedIds.size:0,lastSyncCachedId:null,lastSyncCachedId-seq:null,lastAsyncCachedId:null,lastAsyncCachedId-seq:null,store=permits:10000,sd=nextSeq:6378647,lastRet:MessageOrderCursor:[def:6378646,
low:0, high:0],pending:0 - cursor got duplicate from store
ID:app-client-id-795c4dfcbb-kp6qx-33983-7123677174665-287:366099:1:1:18 seq:
6378646
{noformat}
> Queue size incorrect even when queue is empty
> ---------------------------------------------
>
> Key: AMQ-9654
> URL: https://issues.apache.org/jira/browse/AMQ-9654
> Project: ActiveMQ Classic
> Issue Type: Bug
> Affects Versions: 5.17.6
> Reporter: Matt Pavlovich
> Priority: Major
>
> Environment:
> Linux OS
> ActiveMQ 5.17.6 using network of brokers (2-3 brokers per cluster)
> Cloud deployment with high frequency of network inconsistency
> 1. Queue size may reflect a small number of messages are still pending on the
> queue (1 or 2), but there are no messages present.
> 2. Broker restart corrects the messages
> 3. No clear indications of exception or error in broker or client-side logs
> 4. Application consuming messages using multiple consumers and
> single-message-per-transaction using local transaction ack mode. (Camel JMS,
> Spring, etc)
> 5. Across dozens of brokers processing 100's of millions of messages per
> year, this will occur a handful of times in all.
> Suspect queue size counter consistency issue.
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