maytasm commented on a change in pull request #11440:
URL: https://github.com/apache/druid/pull/11440#discussion_r669325399
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File path: docs/configuration/index.md
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@@ -1015,6 +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.workerCapacityFallback`| 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. Note: this config
is only applicable to `pendingTaskBased` provisioning strategy|-1|
Review comment:
Changed the config name to `workerCapacityHint`. I agree that for
homogeneous cluster we can say that this value should be typically equal to
druid.worker.capacity. For heterogeneous current behavior with non-zero worker
node running, the auto scaler will just pick one random node capacity and use
that to determine the number of worker needed (not the avg). Advice to set to
avg here would be different to what the auto scaler use when there are actually
worker. Although I guess the avg might be better and the auto scaler could use
the avg when there are running worker nodes too.
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