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Improve documentation for druid.indexer.autoscale.workerCapacityHint config (#11444) 

* fix doc

* address comments

* Update docs/configuration/index.md

Co-authored-by: Charles Smith <38529548+techdocsmith@users.noreply.github.com>

Co-authored-by: Charles Smith <38529548+techdocsmith@users.noreply.github.com>
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Maytas Monsereenusorn 2021-07-21 12:48:56 +07:00 committed by GitHub
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@ -1015,7 +1015,7 @@ There are additional configs for autoscaling (if it is enabled):
|`druid.indexer.autoscale.pendingTaskTimeout`|How long a task can be in "pending" state before the Overlord tries to scale up.|PT30S|
|`druid.indexer.autoscale.workerVersion`|If set, will only create nodes of set version during autoscaling. Overrides dynamic configuration. |null|
|`druid.indexer.autoscale.workerPort`|The port that MiddleManagers will run on.|8080|
|`druid.indexer.autoscale.workerCapacityHint`| Worker capacity for determining the number of workers needed for auto scaling when there is currently no worker running. If unset or set to value of 0 or less, auto scaler will scale to `minNumWorkers` in autoScaler config instead. This value should typically be equal to `druid.worker.capacity` when you have a homogeneous cluster and the average of `druid.worker.capacity` across the workers when you have a heterogeneous cluster. Note: this config is only applicable to `pendingTaskBased` provisioning strategy|-1|
|`druid.indexer.autoscale.workerCapacityHint`| An estimation of the number of task slots available for each worker launched by the auto scaler when there are no workers running. The auto scaler uses the worker capacity hint to launch workers with an adequate capacity to handle pending tasks. When unset or set to a value less than or equal to 0, the auto scaler scales workers equal to the value for `minNumWorkers` in autoScaler config instead. The auto scaler assumes that each worker, either a middleManager or indexer, has the same amount of task slots. Therefore, when all your workers have the same capacity (homogeneous capacity), set the value for `autoscale.workerCapacityHint` equal to `druid.worker.capacity`. If your workers have different capacities (heterogeneous capacity), set the value to the average of `druid.worker.capacity` across the workers. For example, if two workers have `druid.worker.capacity=10`, and one has `druid.worker.capacity=4`, set `autoscale.workerCapacityHint=8`. Only applies to `pendingTaskBased` provisioning strategy.|-1|
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