Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/14175#discussion_r71982037
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCoarseGrainedSchedulerBackend.scala
---
@@ -552,7 +552,12 @@ private[spark] class
MesosCoarseGrainedSchedulerBackend(
taskId: String,
reason: String): Unit = {
stateLock.synchronized {
- removeExecutor(taskId, SlaveLost(reason))
+ // Do not call removeExecutor() after this scheduler backend was
stopped because
--- End diff --
Not only removeExecutor(), but also other methods, like reviveOffers(),
killTask(), ..., should not be called after stopped. If you prefer adding
comment in the parent class, then it seems it is more complete to add comment
to all methods that may encounter such case. However, I don't think it is
necessary to do so, as exceptions will be thrown in such case notifying the
caller it is not valid to do such calls, just as why this issue was found.
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