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https://issues.apache.org/jira/browse/QPID-7918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Rudyy updated QPID-7918:
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Fix Version/s: qpid-java-broker-7.1.0
> [Java Broker] Respond to low heap memory condition by throttling producers.
> ---------------------------------------------------------------------------
>
> Key: QPID-7918
> URL: https://issues.apache.org/jira/browse/QPID-7918
> Project: Qpid
> Issue Type: Improvement
> Components: Broker-J
> Reporter: Keith Wall
> Priority: Major
> Fix For: qpid-java-broker-7.1.0
>
>
> Currently, if the cumulative size of messages headers/contents cached in
> direct memory exceeds a threshold, the Java Broker responds by flowing the
> messages to disk and evicting them from memory. This guards the condition of
> excessive *message payload* causing an out-of-memory situation.
> However the Broker also maintains a linked list representing every queues in
> the JVMs heap memory. Each message is represented by a small node in the
> linked list. The Broker's design currently means that the entire linked list
> must reside in (heap) memory (even if the message's content has been paged
> out by the flow to disk mechanism). This gives rise to the the possibility
> that the linked lists backing the queue could exhaust all heap and the Broker
> could fail with an OOM (heap) condition.
> The long term aim is to allow sections linked list to be paged out to
> eliminate this problem, but this would necessitate a deep redesign.
> As a interim measure, it appears that the the JVM's Memory bean
> (MemoryPoolMXBean) could be used to notify the Broker when after a garbage
> collection cycle heap memory usage is above a threshold. The Broker could
> respond to this event by throttling producer, thus allow consumes to catch up
> and hopefully avoiding the failure. The Broker would need to relinquish flow
> control once memory usage had fallen again.
> Consideration would need to be given for different JVMs and different GC
> implementations. Consideration must also be given for use cases where the
> Broker is embedded.
>
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