Timothy Bish created ARTEMIS-2057:
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Summary: 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
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 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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