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https://issues.apache.org/jira/browse/ARTEMIS-2057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595321#comment-16595321
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Robbie Gemmell commented on ARTEMIS-2057:
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Merged to master. Will leave open so you can port to 2.6.x.
> AMQP: Credit window can grow beyond max credit configuration
> ------------------------------------------------------------
>
> Key: ARTEMIS-2057
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2057
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: AMQP
> Affects Versions: 2.6.2
> Reporter: Timothy Bish
> Assignee: Timothy Bish
> Priority: Blocker
> Fix For: 2.6.3
>
>
> The broker currently grants credit based on the 'amqpCredit' configuration
> which default to 1000 using a check on the "remote credit" view which
> includes messages currently queued into proton but not processed by the
> protocol head yet. This accounting can lead to a runaway credit situation if
> the sender is particularly fast or a significant number of small messages are
> batched into one TCP frame and the broker isn't able to clear the backlog
> from the proton queue fast enough such that the queue grows to the point that
> the granting algorithm starts granting "amqpCredit" number of credits on each
> new messages it processes from proton.
> Another smaller issue is that the granting of credit allows for a client to
> have an outstanding balance of more than the configured "amqpCredits" which
> may not be what was originally intended by that option and doesn't match what
> many of the clients do when topping off credit at a low water mark.
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