Github user lianhuiwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/636#discussion_r12310983
--- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala
---
@@ -523,6 +504,89 @@ private[spark] class Master(
}
}
+ private def startMultiExecutorsPerWorker() {
+ val coreNumPerExecutor =
conf.getInt("spark.executor.coreNumPerExecutor", 1)
+ // allow user to run multiple executors in the same worker
+ // (within the same worker JVM process)
+ if (spreadOutApps) {
+ for (app <- waitingApps if app.coresLeft > 0) {
+ var usableWorkers = workers.toArray.filter(_.state ==
WorkerState.ALIVE)
+ .filter(_.coresFree > 0).sortBy(_.coresFree).reverse
+ var leftCoreToAssign = math.min(app.coresLeft,
usableWorkers.map(_.coresFree).sum)
+ val numUsable = usableWorkers.length
+ // Number of cores of each executor assigned to each worker
+ val assigned = Array.fill[ListBuffer[Int]](numUsable)(new
ListBuffer[Int])
+ var pos = 0
+ val memoryNotEnoughFlags = new Array[Boolean](numUsable)
+ while (leftCoreToAssign > 0 &&
memoryNotEnoughFlags.contains(false)) {
+ val coreToAssign = math.min(coreNumPerExecutor, leftCoreToAssign)
+ if (usableWorkers(pos).coresFree - assigned(pos).sum >
coreToAssign &&
+ !memoryNotEnoughFlags(pos)) {
+ if (usableWorkers(pos).memoryFree >
+ app.desc.memoryPerExecutor * (assigned(pos).length + 1)) {
--- End diff --
when usableWorkers(pos).memoryFree = app.desc.memoryPerExecutor *
(assigned(pos).length + 1), that cannot assign executor to current worker.but
in fact now worker has enough memory.
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