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https://issues.apache.org/activemq/browse/AMQ-2467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55056#action_55056
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Gary Tully commented on AMQ-2467:
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Am thinking that producerFlowControll should be off by default. It is an
advanced option that allows producers to block such that the entire queue does
not block on the broker side. So it is relevant when blocking is the desired
behavior.
I think the default should be to use disk space rather than to block. Blocking
should only happen when disk space is exhausted. To enable this, the pending
message policy needs to be configured to spool message indexes to disk.
>From my experience, producer flow control is experienced as "this broker is
>getting slower" where as it should be experienced as the solution to: I have
>configured a queue limit but I don't want to block all producers, just fast
>ones. Disabling it by default will lead users to it when they need it.
> Confusion with changes to the default activemq.xml configuration file
> ----------------------------------------------------------------------
>
> Key: AMQ-2467
> URL: https://issues.apache.org/activemq/browse/AMQ-2467
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.3.0
> Reporter: Bruce Snyder
> Assignee: Bruce Snyder
> Fix For: 5.4.0
>
> Attachments: AMQ-2467.patch.txt
>
>
> The original intent of AMQ-1894 was to make the default configuration more
> production ready instead of a demonstration of features. Evidently some of
> the changes to the default configuration from AMQ-1894 got crossed resulting
> in some undesirable changes including:
> * [Revision
> 812481|http://svn.apache.org/viewvc?view=revision&revision=812481] commented
> out the {{<systemUsage>}} element entirely.
> * [Revision
> 812481|http://svn.apache.org/viewvc?view=revision&revision=812481] also set
> the default {{memoryLimit}} attribute on {{<systemUsage>}} element to 20mb
> instead of the intended128mb.
> * [Revision
> 813011|http://svn.apache.org/viewvc?view=revision&revision=813011] added back
> the {{memoryLimit}} attribute on {{<policyEntry>}} elements that apply to all
> destiations after this attribute had been removed entirely in the original
> patch.
> * [Revision
> 819520|http://svn.apache.org/viewvc?view=revision&revision=819520] added a
> {{<pendingSubscriberPolicy>}} element to the {{<policyEntry>}} element for
> all topics. There should be no pendingSubscriberPolicy by default.
> * [Revision
> 820563|http://svn.apache.org/viewvc?view=revision&revision=820563] added a
> {{<pendingSubscriberPolicy>}} element to the {{<policyEntry>}} element for
> all queues. There should be no pendingSubscriberPolicy by default.
> * It also looks like some of the docs got goofed up so I'll fix that, too.
> * There are also three web applications enabled that shouldn't be including
> camel, demo and fileserver
> ** Enabling the camel web application also enables the camel JMX support
> which just confuses users who notice the camel JMX domain is present
> The original patch for AMQ-1894 removed the {{<destinationPolicy>}} element
> entirely. At a later time it was agreed that it should be put back in but
> only to explicitly enable producer flow control.
> This issue is to remedy these items using a new patch.
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