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

    https://github.com/apache/spark/pull/4082#discussion_r23708804
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerBackend.scala
 ---
    @@ -369,7 +369,7 @@ private[spark] class MesosSchedulerBackend(
       private def recordSlaveLost(d: SchedulerDriver, slaveId: SlaveID, 
reason: ExecutorLossReason) {
         inClassLoader() {
           logInfo("Mesos slave lost: " + slaveId.getValue)
    -      removeExecutor(slaveId.getValue)
    +      removeExecutor(slaveId.getValue, reason.toString)
    --- End diff --
    
    does mesos ever actually give us a useful reason?  though it would be nice 
to have an actual reason for the executor being remove, it seems we'll end up 
with the "reason" for the executor removed event is just "Executor Lost", which 
is pretty useless.


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