juliuszsompolski commented on a change in pull request #25946: [SPARK-29263]
availableSlots in resourceOffers can change before being checked by barrier
TaskSet
URL: https://github.com/apache/spark/pull/25946#discussion_r328786648
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File path:
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala
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@@ -444,6 +443,7 @@ private[spark] class TaskSchedulerImpl(
// of locality levels so that it gets a chance to launch local tasks on
all of them.
// NOTE: the preferredLocality order: PROCESS_LOCAL, NODE_LOCAL, NO_PREF,
RACK_LOCAL, ANY
for (taskSet <- sortedTaskSets) {
+ val availableSlots = availableCpus.map(c => c / CPUS_PER_TASK).sum
Review comment:
to avoid reiterating over the availableCpus array, we could also have one
var that gets passed and updated inside resourceOfferSingleTaskSet, but that
would likely be an overoptimization of this O(#num_offers) sum.
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