squito commented on a change in pull request #23951: [SPARK-13704][CORE][YARN]
Re-implement RackResolver to reduce resolving time
URL: https://github.com/apache/spark/pull/23951#discussion_r266524015
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File path: core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
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@@ -190,14 +190,15 @@ private[spark] class TaskSetManager(
private def addPendingTasks(): Unit = {
val (_, duration) = Utils.timeTakenMs {
- val array = new ArrayBuffer[(String, Int)]() // Array(preferredLocation,
task index)
+ val hostToIndices = new HashMap[String, ArrayBuffer[Int]]()
for (i <- (0 until numTasks).reverse) {
- addPendingTask(i, Some(array))
+ addPendingTask(i, Option(hostToIndices))
Review comment:
nit: more idiomatic to use `Some(hostToIndices)` here
(`Option(foo)` is used to guard against `foo` being `null`, and convert it
into `None`, but it can't be null here).
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