Github user lianhuiwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/636#discussion_r12268618
--- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala
---
@@ -523,6 +504,81 @@ 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) {
+ val usableWorkers = workers.toArray.filter(_.state ==
WorkerState.ALIVE)
+ .filter(app.desc.memoryPerExecutor <
_.memoryFree).sortBy(_.coresFree).reverse
+ var toAssign = math.min(app.coresLeft,
usableWorkers.map(_.coresFree).sum)
+ val numUsable = usableWorkers.length
+ // Number of cores of each executor assigned to each worker
+ val assigned = new Array[ListBuffer[Int]](numUsable)
+ var pos = 0
+ while (toAssign > 0) {
+ val assignedCore = math.min(coreNumPerExecutor, toAssign)
+ if (usableWorkers(pos).coresFree - assigned(pos).sum > 0) {
--- End diff --
if (usableWorkers(pos).coresFree - assigned(pos).sum > 0) {
that should update:if (usableWorkers(pos).coresFree - assigned(pos).sum >=
assignedCore) {
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