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Posted to dev@drill.apache.org by GitBox <gi...@apache.org> on 2020/03/02 04:45:47 UTC

[GitHub] [drill] weijietong commented on issue #2000: DRILL-7607: support dynamic credit based flow control

weijietong commented on issue #2000: DRILL-7607: support dynamic credit based flow control
URL: https://github.com/apache/drill/pull/2000#issuecomment-593216689
 
 
   @paul-rogers agree with your two configure item advice.   But I suggest to configure `Enable/disable this feature` item as system level .  Also by adding another `enableDynamicFC` at the `BitControll.Collector` , users can give a hint to a query to specify whether its query will enable this feature, that's to say it's a query level option. 
   
   To spooling , I think it's been used if the planner choose to use MergeJoin or StreamingAgg.  You could see the `HashToMergeExchange` which is the only class to set the spooling item as true.
   

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