[GitHub] [pulsar] Demogorgon314 commented on issue #15905: [Doc] Threshold Shedder documentation - need to add documentation on the individual weights

[GitBox <gi...@apache.org>]

Demogorgon314 commented on issue #15905:
URL: https://github.com/apache/pulsar/issues/15905#issuecomment-1158581682

   > "The weights for each resource are configurable." - it would be great if the weights were listed or perhaps a link to the relevant section of the reference configuration here https://pulsar.apache.org/docs/reference-configuration/#broker
   
   You can see these configurations.
   ```
   # The BandWithIn usage weight when calculating new resource usage.
   # It only takes effect in the ThresholdShedder strategy.
   loadBalancerBandwithInResourceWeight=1.0
   
   # The BandWithOut usage weight when calculating new resource usage.
   # It only takes effect in the ThresholdShedder strategy.
   loadBalancerBandwithOutResourceWeight=1.0
   
   # The CPU usage weight when calculating new resource usage.
   # It only takes effect in the ThresholdShedder strategy.
   loadBalancerCPUResourceWeight=1.0
   
   # The heap memory usage weight when calculating new resource usage.
   # It only takes effect in the ThresholdShedder strategy.
   loadBalancerMemoryResourceWeight=1.0
   
   # The direct memory usage weight when calculating new resource usage.
   # It only takes effect in the ThresholdShedder strategy.
   loadBalancerDirectMemoryResourceWeight=1.0
   ```
   
   > "If a broker's usage is greater than the average usage per broker plus the loadBalancerBrokerThresholdShedderPercentage"
   Is that percentage an absolute percentage?
   
   It should be an absolute percentage.
   
   Example:
   Assume we have three brokers, the broker1 avg broker usage is 40%, the broker2 avg broker usage is 10%, the broker3 avg broker usage is 10%, then the cluster avg usage should be ((40% + 10% + 10%) / 3) = 20%.
   
   If we set `loadBalancerBrokerThresholdShedderPercentage=1`, then the broker1's some bundles will get unloaded, because broker1 broker avg usage is greater than cluster avg usage plus loadBalancerBrokerThresholdShedderPercentage.
   
   


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