[GitHub] sjmeyer commented on issue #5279: Slices backed by AWS Athena load sequentially, not in parallel.

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sjmeyer commented on issue #5279: Slices backed by AWS Athena load sequentially, not in parallel.
URL: https://github.com/apache/incubator-superset/issues/5279#issuecomment-402650881
 
 
   @mistercrunch I'm busy doing some more digging around and found something interesting. I am logging out the timestamp when the Ajax from a slice hits the explore_json endpoint, and I'm logging out when the query() method is called to execute the query. Even though I have 16 workers, only 4 Ajax calls are handled at first. After that some are staggered and some are handled two by two.
   
   When it comes to executing the queries, they are being run in sequence. It is clear from the logs that one is waiting for another to finish before running. Is it possible that the issue is with the JDBC driver or the way in which that connection is made?
   
   Also, any idea why only 4 Ajax requests would be handled even when 16 workers are used?
   

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