Keith Wall created QPID-7723:
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Summary: [0-10] Performance drop ~2% since February transient
auto-ack
Key: QPID-7723
URL: https://issues.apache.org/jira/browse/QPID-7723
Project: Qpid
Issue Type: Task
Components: Java Broker
Reporter: Keith Wall
Fix For: qpid-java-broker-7.0.0
We are seeing a slowdown in the Java Broker for the 0-10 protocol since
February 2017. Investigation with JProfiler is pointing to the introduction of
the ring queue feature as being a possible cause. The performance drop is
most apparent with on the transient profiles, where the drop is around ~2-3%.
The problem is the call to MessageMetaData_0_10#getStorableSize made from
AbstractQueueEntryList#updateStatsOnEnqueue. On the 0-10 path, this causes the
header delivery properties/message properties/non standard delivery properties
to be encoded in order to compute the store size. This encoding step is
separate to the encoding step that takes place when the message is sent to a
consumer. The up shot is that the headers for transient message that is not
flown to disk are now encoded twice rather than once.
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