vanzin commented on issue #24982: [SPARK-28181][CORE] Add a filter interface to 
KVStore to speed up the entities retrieve
URL: https://github.com/apache/spark/pull/24982#issuecomment-506998016
 
 
   >  The target is getting all tasks with particular status from all tasks.
   
   Right. That means a view with the "status" index, configured with both 
"first" and 'last" to match the desired status. That will return all the tasks 
with the status you're looking for. And doesn't require deserializing anything 
to find the desired tasks.
   
   Unless I'm not understanding what exactly it is you're trying to find.

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