[jira] [Created] (QPID-4632) Change Threshold Alerts from Level-Sensitive to Edge-Triggered

["Ted Ross (JIRA)" <ji...@apache.org>]

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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