viirya commented on issue #26696: [WIP][SPARK-18886][CORE] Only reset 
scheduling delay timer if allocated slots are fully utilized
   > AFAIK, the issue of delay scheduling is: it has a timer per task set 
manager, and the timer gets reset as soon as there is one task from this task 
set manager gets scheduled on a preferred location.
   > A stage may keep waiting for locality and not leverage available nodes in 
the cluster, if its task duration is shorter than the locality wait time (3 
seconds by default).
   By adjusting the locality wait time, can't users make better trade off 
between locality and cluster utilization? In this case, users can set a smaller 
locality wait time.

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