315157973 opened a new pull request, #17456:
URL: https://github.com/apache/pulsar/pull/17456
### Motivation
The existing ThresholdShedder has the following problems, for example:
There are 11 Brokers, of which 10 are loaded at 80% and 1 is loaded at 0%.
The average load is 80 * 10 / 11 = 72.73, and the threshold to unload is
72.73 + 10 = 82.73.
Since 80 < 82.73, unload will not be trigger, and there is one idle Broker
with load of 0%.
On the basis of ThresholdShedder, we adds the lower boundary judgment of the
load.
When 【current usage < average usage - threshold】, the broker with the
highest load will be triggered to unload
### Modifications
Support lower boundary shedding for ThresholdShedder
### Verifying this change
1. Does not affect the original ThresholdShedder
2. The new unit test can pass
### Documentation
- [ x ] `doc-required`
(Your PR needs to update docs and you will update later)
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