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https://issues.apache.org/jira/browse/QPID-4632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Ross resolved QPID-4632.
----------------------------
Resolution: Fixed
Fix Version/s: (was: Future)
0.21
Commit 1454601
> 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
> Assignee: Ted Ross
> Fix For: 0.21
>
> Attachments: QPID-4632.patch
>
>
> 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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