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From "Rob Godfrey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (QPID-7963) [AMQP1.0] Sending a large message to a client uses excessive heap memory
Date Sat, 07 Oct 2017 19:22:02 GMT

     [ https://issues.apache.org/jira/browse/QPID-7963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rob Godfrey updated QPID-7963:
    Attachment: QPID-7963.diff

Attached a trivial patch to use iteration rather than recursion.  Note we still don't handle
the case of session credit being fully used up part way through message transfer.

> [AMQP1.0] Sending a large message to a client uses excessive heap memory
> ------------------------------------------------------------------------
>                 Key: QPID-7963
>                 URL: https://issues.apache.org/jira/browse/QPID-7963
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>    Affects Versions: qpid-java-broker-7.0.0
>            Reporter: Keith Wall
>         Attachments: AMQP1.0transientmessagestraverseheap.png, QPID-7963.diff
> Examining heap usage whilst running a large transient message test, I see that large
AMQP 1.0 messages manifest fully on the heap whilst they traverse the Broker.  Neither AMQP
0-9 not AMQP 0-10 do this.
> See attached jvisualvm screenshot.  The spike at 3.17PM is a 300MB message being produced/consumed.
  Later in the same test (same graph) a 750MB message went over AMQP 0-9 and 0-10 messages
with no discernible heap impact.
> Command line was:
> {{(export MAVEN_OPTS='-Xmx3g'; mvn package exec:java -f pom.xml -Dstresstest=qpid-jms-client
-Dexec.args='messagecount=1 size=300000000   random=false jndiProperties=stress-test-client-qpid-jms-client.properties')}}
> Java Broker running with out of the box memory settings with {{-Dqpid.max_message_size=2000000000

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