Ted Ross created QPID-4632:
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Summary: Change Threshold Alerts from Level-Sensitive to
Edge-Triggered
Key: QPID-4632
URL: https://issues.apache.org/jira/browse/QPID-4632
Project: Qpid
Issue Type: Improvement
Components: C++ Broker
Affects Versions: 0.20
Reporter: Ted Ross
Fix For: Future
Queue threshold events are currently level-sensitive and require a
rate-limiting feature. Every time a message is enqueued and the queue depth is
above the configured threshold, an event is potentially raised. The
repeat-interval attribute prevents the event from being raised too frequently.
Also, there is no way to produce an event for a lower or going-down threshold.
The threshold feature should be changed to be edge-triggered as follows:
Per-queue configuration for thresholds is:
- upper-threshold (bytes and messages)
- lower-threshold (bytes and messages)
Two event types are (or one type with an argument) defined:
- threshold crossed increasing
- threshold crossed decreasing
The increasing event is raised when the queue depth goes from (upper-threshold
- 1) to upper-threshold.
The decreasing event is raised when the queue depth goes from (lower-threshold
+ 1) to lower-threshold.
The upper and lower thresholds should have some gap between them to establish
hysteresis which will result in limited event rates.
Message and Byte thresholds will be handled independently.
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