baohe-zhang commented on pull request #28412:
URL: https://github.com/apache/spark/pull/28412#issuecomment-654455672


   @tgravescs I measured the memory usage of an app that contains 4 jobs, and 
each job contains 1 stage, each stage contains 100000 tasks (the max retained 
tasks per stage by default). The number of entities stored in kvstore are 4 
jobs, 4 stages, and 400000 tasks.  The log size of this app is 1.1 GB, and the 
memory usage is 212 MB. I measured another app that contains 1000 jobs (the max 
retained jobs by default), each job contains 1 stage and each stage contains 
400 tasks. The total number of entities for this app are 1000 jobs, 1000 
stages, and 400000 tasks, which led to a 1.29 GB log file and 271 MB memory 
usage. 


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