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Status Not under consideration
Workspace MQ, MQ Advanced & MQ Appliance
Created by Guest
Created on Sep 20, 2019

RELATED IDEAS

Document com.ibm.mq.jmqi.defaultMaxMsgSize JVM environment variable

See this idea on ideas.ibm.com

Since IBM has hidden the fact that an MQGET for Java/JMS will actually use an initial buffer of 4KB and if the message is larger then it does (1) re-allocates the buffer size to the new larger size and (2) issues another MQGET to retrieve the message.

This convoluted method needs to be document along with the 2 JVM environment variables that control it:
- com.ibm.mq.jmqi.defaultMaxMsgSize
- com.ibm.mq.jmqi.smallMsgBufferReductionThreshold

THe MQ Knowledge Center does not have any information on this functionality nor on the 2 JVM environment variables.

The only IBM web pages that have any information are:
- https://developer.ibm.com/answers/questions/268069/maxmsgl-questions-in-regards-to-mq-jms-application.html
- https://www-01.ibm.com/support/docview.wss?uid=swg1IV09144
- https://www-01.ibm.com/support/docview.wss?uid=swg1IT01374

Idea priority High
RFE ID 136680
RFE URL
RFE Product IBM MQ
  • Guest
    Reply
    |     Jul 1, 2021
    Like many internal tuning parameters these are not formally documented, as algorithms and options can change at any time for improved operation. Service technotes may refer to something that is valid for a particular release but is not guaranteed to be maintained.

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