Martyn Taylor created ARTEMIS-627:
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Summary: Producer Block does work properly on CORE protocol
Key: ARTEMIS-627
URL: https://issues.apache.org/jira/browse/ARTEMIS-627
Project: ActiveMQ Artemis
Issue Type: Bug
Reporter: Martyn Taylor
To BLOCK production of messages to an address once it reaches a particular size
in memory, an AddressSetting can be added to the broker that specifies the
address size, address match string and the address full policy "BLOCK".
This should block messages once the address is full, however the current
implementation uses flow control to allocate producers credits, once the
address is full the broker will not allocate any more credits.
There are two issues with this approach.
1. The main issue is that the credits are not tracked or checked at the broker
side. The ActiveMQ client takes care of blocking message production when it
runs out of credit. However, a rogue client could easily allocate it's own
credits and continue sending. I've tested this by hacking the client and it
behaves in this way.
2. Even in a non hacked client the size of the address could be pushed over
it's limit, as more credits can be allocated than is available space on the
address. An address can be full, no more credits are allocated but each
producer is able to empty it's credits pushing the address over its limit.
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