Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/5063#discussion_r28386441
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerBackend.scala
---
@@ -233,9 +234,7 @@ private[spark] class MesosSchedulerBackend(
getResource(o.getResourcesList, "cpus").toInt
} else {
// If the executor doesn't exist yet, subtract CPU for executor
--- End diff --
Perhaps we can elaborate on this comment a little:
```
// If the Mesos executor has not been started on this slave yet, set aside
a few
// cores for the Mesos executor by subtracting this from the number that
would
// have been granted to the Spark executor
```
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