clintropolis opened a new pull request, #19536:
URL: https://github.com/apache/druid/pull/19536

   ### Description
   This PR updates the default S3 connection pool size to be computed based on 
the number of available processors to be more friendly to the default load on 
demand thread pool concurrency limits added in #19396 (so that there are ~ the 
same number of s3 connections in the pool as there are download threads allowed 
to run on demand)
   
   changes:
   * `AWSClientConfig` now defaults `maxConnections` to scale with available 
processors `(max(50, 4 * cores))` to be in sync with virtual storage mode 
historical download thread pool size
   * tests with artificial `RuntimeInfo` to cover the config scaling
   


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