tgravescs commented on issue #26614: [SPARK-29976][CORE] New conf for single 
task stage speculation
URL: https://github.com/apache/spark/pull/26614#issuecomment-558660758
 
 
   it seems like either the number of slots on 1 executor or a config might be 
best. I think there are corner cases for all of these its just picking the one 
that seems to cover most. 
   
   just a side note, Tez has a similar configs but it only applies when a 
single task is run. it is obviously different but did solve a problem was saw 
at Yahoo.  So based on what we saw there I'm kind of leaning towards the tasks 
<= number of slots of 1 executor.  That doesn't add another config, covers the 
1 task case, plus the 1 bad executor case.  @squito  thoughts?

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