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From "Christopher L. Shannon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-6940) Significant memory footprint increase from 5.8.0 to 5.15.3
Date Thu, 29 Mar 2018 10:47:00 GMT

    [ https://issues.apache.org/jira/browse/AMQ-6940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16418745#comment-16418745
] 

Christopher L. Shannon commented on AMQ-6940:
---------------------------------------------

In flight messages by definition are messages that have not been processed but have simply
been dispatched to a consumer.  Messages are not "processed" until a consumer acknowledges
the message so the broker does not drop a message until then.  

This dispatched list is not new.  It is only new for a TopicSubscription.  It has been used
for 10 years for Queue subscriptions and Durable subscriptions to track in flight messages. 
See https://github.com/apache/activemq/blame/master/activemq-broker/src/main/java/org/apache/activemq/broker/region/PrefetchSubscription.java#L217

> 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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