Github user mgummelt commented on a diff in the pull request:
https://github.com/apache/spark/pull/11157#discussion_r62135836
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/CoarseMesosSchedulerBackend.scala
---
@@ -72,13 +71,13 @@ private[spark] class CoarseMesosSchedulerBackend(
private val shuffleServiceEnabled =
conf.getBoolean("spark.shuffle.service.enabled", false)
// Cores we have acquired with each Mesos task ID
- val coresByTaskId = new HashMap[String, Int]
+ val coresByTaskId = new mutable.HashMap[String, Int]
--- End diff --
Why make these mutable? AFAICT, they don't need to be.
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