[QPID-7963] [AMQP1.0] Sending a large message to a client uses excessive heap memory

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: qpid-java-broker-7.0.0
• Fix Version/s: qpid-java-broker-7.0.0
• Component/s: Broker-J
• Assignee: Alex Rudyy
• Reporter: Keith Wall
• Created: 06/Oct/17 14:27
• Updated: 14/Nov/17 22:00
• Resolved: 12/Oct/17 12:12

Description

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 -Dqpid.port.max_message_size=2000000000