bmarcott commented on a change in pull request #27207:
URL: https://github.com/apache/spark/pull/27207#discussion_r418921110
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File path:
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala
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@@ -466,12 +503,28 @@ private[spark] class TaskSchedulerImpl(
}.sum
}
+ private def minTaskLocality(
+ l1: Option[TaskLocality],
+ l2: Option[TaskLocality]) : Option[TaskLocality] = {
+ if (l1.isEmpty) {
+ l2
+ } else if (l2.isEmpty) {
+ l1
+ } else if (l1.get < l2.get) {
+ l1
+ } else {
+ l2
+ }
+ }
+
/**
* Called by cluster manager to offer resources on slaves. We respond by
asking our active task
* sets for tasks in order of priority. We fill each node with tasks in a
round-robin manner so
* that tasks are balanced across the cluster.
Review comment:
yes I can add something like: if true, then the parameter offers
contains all workers and their free resources. See delay scheduling comments in
class description.
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