Configuration Options Related Tasks Related Topics
Use this page to define upper and lower byte and/or message thresholds for the topic. Exceeding these thresholds will trigger events such as generating log messages and starting message flow control. You can also specify a maximum size allowed for messages on the topic and select a pre-configured quota, which determines the maximum number of bytes or messages that the topic is allowed to store to conserve memory use.
If a JMS template is specified for this topic, then the default values imply that the actual value will come from the template. A JMS server can also manage thresholds and certain quota settings for all destinations in a JMS module targeted to that JMS server.
Name | Description |
---|---|
Bytes Threshold High |
The upper threshold (total number of bytes in this destination)
that triggers logging or flow control events. The value of
If the number of bytes exceeds this threshold, the triggered events are:
Any change to this threshold affects only incoming messages; stored messages are not affected. MBean Attribute
(Does not apply to application modules): Minimum value: Maximum value: |
Bytes Threshold Low |
The lower threshold (total number of bytes in this destination)
that triggers logging or flow control events. The value of
If the number of bytes falls below this threshold, the triggered events are:
Any change to this threshold affects only incoming messages; stored messages are not affected. MBean Attribute
(Does not apply to application modules): Minimum value: Maximum value: |
Messages Threshold High |
The upper threshold (total number of messages in this
destination) that triggers logging or flow control events. The
value of If the number of messages exceeds this threshold, the triggered events are:
Any change to this threshold affects only incoming messages; stored messages are not affected. MBean Attribute
(Does not apply to application modules): Minimum value: Maximum value: |
Messages Threshold Low |
The lower threshold (total number of messages in this
destination) that triggers logging or flow control events. The
value of If the number of messages falls below this threshold, the triggered events are:
Any change to this threshold affects only incoming messages; stored messages are not affected. MBean Attribute
(Does not apply to application modules): Minimum value: Maximum value: |
Quota |
A Quota controls the allotment of system resources available to destinations. For example, the number of bytes a destination is allowed to store can be configured with a Quota. MBean Attribute
(Does not apply to application modules): |
Maximum Message Size |
The maximum size of a message that is accepted from producers on this destination. The message size includes the message body, any user-defined properties, and the user-defined JMS header fields: JMSCorrelationID and JMSType . Producers sending messages that exceed the configured maximum message size for the destination receive a ResourceAllocationException . The maximum message size is only enforced for the initial production of a message. Messages that are redirected to an error destination or forwarded to a member of a distributed destination are not checked for size. For instance, if a destination and its corresponding error destination are configured with a maximum message size of 128K bytes and 64K bytes, respectively, a message of 96K bytes could be redirected to the error destination (even though it exceeds the 64K byte maximum), but a producer could not directly send the 96K byte message to the error destination. This attribute is dynamically configurable, but only incoming messages are impacted; stored messages are not impacted. MBean Attribute
(Does not apply to application modules): Minimum value: Maximum value: |