Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/8340#discussion_r37599461
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverSchedulingPolicy.scala
---
@@ -144,27 +141,31 @@ private[streaming] class ReceiverSchedulingPolicy {
val scheduledExecutors = mutable.Set[String]()
scheduledExecutors ++= preferredLocation
- val executorWeights = receiverTrackingInfoMap.values.flatMap {
receiverTrackingInfo =>
- receiverTrackingInfo.state match {
- case ReceiverState.INACTIVE => Nil
- case ReceiverState.SCHEDULED =>
- val scheduledExecutors =
receiverTrackingInfo.scheduledExecutors.get
- // The probability that a scheduled receiver will run in an
executor is
- // 1.0 / scheduledLocations.size
- scheduledExecutors.map(location => location -> (1.0 /
scheduledExecutors.size))
- case ReceiverState.ACTIVE =>
Seq(receiverTrackingInfo.runningExecutor.get -> 1.0)
- }
+ val executorWeights = receiverTrackingInfoMap.filter(_._1 !=
receiverId).values.flatMap {
+ receiverTrackingInfo =>
+ receiverTrackingInfo.state match {
+ case ReceiverState.INACTIVE => Nil
+ case ReceiverState.SCHEDULED =>
+ val scheduledExecutors =
receiverTrackingInfo.scheduledExecutors.get
+ // The probability that a scheduled receiver will run in an
executor is
+ // 1.0 / scheduledLocations.size
+ scheduledExecutors.map(location => location -> (1.0 /
scheduledExecutors.size))
+ case ReceiverState.ACTIVE =>
Seq(receiverTrackingInfo.runningExecutor.get -> 1.0)
+ }
}.groupBy(_._1).mapValues(_.map(_._2).sum) // Sum weights for each
executor
- val idleExecutors = (executors.toSet -- executorWeights.keys).toSeq
- if (idleExecutors.size >= preferredNumExecutors) {
- // If there are more than `preferredNumExecutors` idle executors,
return all of them
+ val idleExecutors = executors.toSet -- executorWeights.keys
+ if (idleExecutors.nonEmpty) {
scheduledExecutors ++= idleExecutors
} else {
- // If there are less than `preferredNumExecutors` idle executors,
return 3 best options
- scheduledExecutors ++= idleExecutors
- val sortedExecutors = executorWeights.toSeq.sortBy(_._2).map(_._1)
- scheduledExecutors ++= (idleExecutors ++
sortedExecutors).take(preferredNumExecutors)
+ // There is no idle executor. So select all executors that have the
minimum weight.
+ val sortedExecutors = executorWeights.toSeq.sortBy(_._2)
+ if (sortedExecutors.nonEmpty) {
+ val minWeight = sortedExecutors(0)._2
+ scheduledExecutors ++= sortedExecutors.takeWhile(_._2 ==
minWeight).map(_._1)
+ } else {
+ // This should not happen since "executors" is not empty
--- End diff --
Are you talking about `executorWeights no being empty?
And why it cannot be empty? Is it because that by the time
`rescheduleReceiver` is called, all the receivers have already been scheduling
by `scheduleReceivers` which means that there are some weights for at some
executors?
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