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https://issues.apache.org/jira/browse/AMQ-6422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15471382#comment-15471382
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Timothy Bish commented on AMQ-6422:
-----------------------------------

A couple things to note here, the unsettled count and the credit on the link 
aren't really tied to each other at all.  The remote can keep granting credit 
and not settle anything if it wishes and I don't think there's test that cover 
that case.  Also the remote could request that all deliveries are sent settled 
so there'd be no movement on that counter, which I don't think is tested much 
here so there could be issues yet to be discovered in that area.  

> AMQP - flow(1) without a dispositon can lead to blocked receive
> ---------------------------------------------------------------
>
>                 Key: AMQ-6422
>                 URL: https://issues.apache.org/jira/browse/AMQ-6422
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: AMQP
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>
> Setting prefetch based on the credit can get in a knot if the credit is small 
> and the dispositions are outstanding.
> The prefetch gets set to 1, but with an inflight message, there is nothing 
> dispatched b/c the sub looks full.



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