Add threshold for each unload round for uniform load shedder #13915
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@mattisonchao Thanks for your review. The feature was added in pulsar 2.10.0, and we will add doc to explain the unload strategy. For the default values, in most of cases, we don't need to change it, so we can make them default first aiming to make |
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…13915) ### Motivation For current uniform load shedder, it will unload 50% of (max throughput - min throughput) or (max message rate - min message rate). If the max throughput is 500MB/s, and the min throughput is 0MB/s, it will unload 250MB/s throughput at a time, which will lead the broker into high load for unloading a lot of bundles and cause the broker unstable. Another problem is that the current implementation has no min unload threshold limit. For example, if the max broker throughput is 1MB/s and the min broker throughput is 0MB/s, it will unload 0.5MB/s throughput from the max throughput broker, which is unnecessary and will cause bundle frequently unload. ### Modification Change the default unload percentage from 50% to 20%, aiming to make the unload process smooth. Add MIN_UNLOAD_MESSAGE=1000 and MIN_UNLOAD_THROUGHPUT=1 * MB, which will skip the low throughput bundle unload and decrease the bundle unload frequency.
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Motivation
For current uniform load shedder, it will unload 50% of
(max throughput - min throughput)or (max message rate - min message rate). If the max throughput is 500MB/s, and the min throughput is 0MB/s, it will unload 250MB/s throughput at a time, which will lead the broker into high load for unloading a lot of bundles and cause the broker unstable.Another problem is that the current implementation has no min unload threshold limit. For example, if the max broker throughput is 1MB/s and the min broker throughput is 0MB/s, it will unload 0.5MB/s throughput from the max throughput broker, which is unnecessary and will cause bundle frequently unload.
Modification
MIN_UNLOAD_MESSAGE=1000andMIN_UNLOAD_THROUGHPUT=1 * MB, which will skip the low throughput bundle unload and decrease the bundle unload frequency.Documentation
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