Throttling Properties
Figure 1–19 Throttling Properties Panel
As described in Performance Issues, you can use the JMS IQ Manager as a semi-permanent storage medium only if you have sufficient memory and disk resources. To manage the memory and disk resources needed by the JMS IQ Manager, you use the publisher throttling feature. You can specify several properties for throttling, as described in the following sections:
Per-Destination Throttling Threshold
The Per-Destination Throttling Threshold property specifies the maximum number of messages per topic or queue after which all producers of the message destination are throttled, assuming the Server Throttling Threshold has been exceeded. Once a producer is throttled, the JMS IQ Manager stops reading messages from it until the number of undelivered messages in the affected destination has dropped to less than the difference between the value specified by the Per-Destination Throttling Threshold and the value specified by the Throttling Lag. See also Throttling Lag.
Allowed Values
An integer from 0 through 999,999,999 indicating the number of messages. If you specify 0, the publishers are never throttled.
Default Value
The default is 1000 messages.
Server Throttling Threshold
The Server Throttling Threshold property specifies the total number of messages for all message destinations combined before the JMS IQ Manager starts throttling any producers. For a detailed explanation and an example, see Throttling Producers.
Allowed Values
An integer from 0 through 999,999,999 indicating the number of messages. If you specify 0, no producers are ever throttled.
Default Value
The default is 100,000 messages.
Throttling Lag
Use the Throttling Lag property in combination with the Per-Destination Throttling Threshold property. Once a producer is throttled, the JMS IQ Manager stops reading messages from it until the number of undelivered messages in the affected destination has dropped to less than the difference between the value specified by the Per-Destination Throttling Threshold and the value specified by the Throttling Lag. See also Per-Destination Throttling Threshold.
Allowed Values
An integer from 0 through 99,999,999. The value must be less than that of the Per-Destination Throttling Threshold property.
Default Value
The default is 100 messages.
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