Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8639#discussion_r42300656
  
    --- Diff: docs/running-on-mesos.md ---
    @@ -194,6 +194,10 @@ conf.set("spark.mesos.constraints", 
"tachyon=true;us-east-1=false")
     
     For example, Let's say `spark.mesos.constraints` is set to 
`tachyon=true;us-east-1=false`, then the resource offers will be checked to see 
if they meet both these constraints and only then will be accepted to start new 
executors.
     
    +Spark rejects offers for slaves with unmet constraints for 120 seconds by 
default.
    +This makes mesos not sending the rejected offers again and again.
    +The reject offer duration is configurable using 
`conf.set("spark.mesos.rejectOfferDurationForUnmetConstraints", "60")` (for 
example).
    +
    --- End diff --
    
    I actually don't think this is worth documenting. I can't imagine anyone 
who wants to set this explicitly as long as we pick a sane enough default.


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