zmatyus commented on pull request #1923:
URL: https://github.com/apache/hive/pull/1923#issuecomment-786571251


   @pdbenitez91 : not sure what queries can make this the most visible. All 
I've seen was a report (Grafana screenshot) about increasing memory usage and a 
heap dump where the `factories` hashmap of 
`org.apache.commons.logging.LogFactory` holds on to thousands of class loaders, 
each of which retains some memory. I'm not sure either monitoring or head dump 
is an option with AWS.
   
   Seeing how this is about class loaders, you might experiment with queries 
that use Custom UDFs with lots of classes defined in their jar files... but I'm 
just guessing.


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