Is there a way to change the Delivery Mode in Publ

问题:

​I am sending messages to IBM MQ using Nifi PublishJMS processor. The Messages have Persistence = Persistent in MQ. I want to change it to Non-Persistent. Is there a property in Nifi PublishJms processor to correct this? Or is it done from the MQ side. I don't have access to MQ servers, I can only check the messages being delivered to the queue.

回答1:

At a low level a MQ client applications can specify the following persistence values:

• MQPER_PERSISTENCE_AS_PARENT (Use the value of the next topic above this one)
• MQPER_NOT_PERSISTENT (self-explanatory)
• MQPER_PERSISTENT (self-explanatory)
• MQPER_PERSISTENCE_AS_TOPIC_DEF (Use the value of this topic, the default on a topic is ASPARENT so this works like MQPER_PERSISTENCE_AS_PARENT where defaults are in use)

If nothing is specified then MQPER_PERSISTENCE_AS_TOPIC_DEF is the default.

Within the JMS API you can override this using a URI property as follows:

queue:///theQueueName?persistence=1

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Property persistence and all URI properties are documented in the IBM MQ v8 Knowledge center page "Creating destinations in a JMS application".

Property name: persistence

• -2 - As specified on the send() call or, if not specified on the send() call, the default persistence of the message producer.
• -1 - As specified by the DefPersistence attribute of the IBM MQ queue or topic.
• 1 - Nonpersistent.
• 2 - Persistent.
• 3 - Equivalent to the value HIGH for the PERSISTENCE property as used in the IBM MQ JMS administration tool. For an explanation of this value, see JMS persistent messages.