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https://issues.apache.org/jira/browse/AMQ-6940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16418213#comment-16418213
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Christopher L. Shannon commented on AMQ-6940:
---------------------------------------------
The reason why this has never come up is because you are running on a very
small JVM for the number of consumers and producers you have. 600 megabytes of
memory is pretty small given the number of producers and consumers you are
using. So yes the feature is not going to scale without proper memory
allocation. The short term solution is to simply increase your heap size.
A more permanent fix would is to add a flag to the policy configuration to
disable the inflight statistics on TopicSubscription so that the dispatched
array doesn't collect objects anymore (basically what you already did). This
is something that can be added for the next patch release so you can disable
the statistics.
> Significant memory footprint increase from 5.8.0 to 5.15.3
> ----------------------------------------------------------
>
> Key: AMQ-6940
> URL: https://issues.apache.org/jira/browse/AMQ-6940
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.15.3
> Environment: Java jdk1.8.0_144
> OS Linux 4.4.19-29.55.amzn1.x86_64
> Reporter: Johno Crawford
> Priority: Major
> Attachments: activemq.xml, amq_heap2.png, messageid_analysis.png
>
>
> Recently we upgraded from 5.8.0 to 5.15.3 on one of our environments and
> found the broker running out of memory with the old broker configurations.
> I suspect this may be related to the new inflight message size calculation
> but haven't been able to create a reproducer just yet.
> Broker JVM running with opts
> {code:java}
> -Xss256k -Xms600m -Xmx600m -Xmn128m -Dfile.encoding=ISO-8859-1
> -Dlog4j.watchDelay=60000 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps
> -XX:+PrintGCDateStamps -XX:+PrintPromotionFailure -XX:PrintFLSStatistics=1
> -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+PrintClassHistogram -verbose:gc
> -Dsun.rmi.dgc.client.gcInterval=7200000
> -Dsun.rmi.dgc.server.gcInterval=7200000
> {code}
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