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https://issues.apache.org/jira/browse/ARTEMIS-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15376279#comment-15376279
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clebert suconic commented on ARTEMIS-627:
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> Preferably the BLOCK would behave as outlined in the docs, which does require
> some changes.
Performance would be inviable to implement the feature in such way. And even
so it's not worth the implementation.
Just document it. As this is working as designed. you can't fix all the corner
cases without sacrificing performance. (i.e. issuing credits on demand and
adding excessive control for that.)
> 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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