Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/731#discussion_r27925182
--- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala
---
@@ -583,31 +560,68 @@ private[master] class Master(
}
// Now that we've decided how many cores to give on each node,
let's actually give them
for (pos <- 0 until numUsable) {
- if (assigned(pos) > 0) {
- val exec = app.addExecutor(usableWorkers(pos), assigned(pos))
- launchExecutor(usableWorkers(pos), exec)
- app.state = ApplicationState.RUNNING
- }
+ allocateWorkerResourceToExecutors(app, assigned(pos),
usableWorkers(pos))
}
}
} else {
- // Pack each app into as few nodes as possible until we've assigned
all its cores
+ // Pack each app into as few workers as possible until we've
assigned all its cores
for (worker <- workers if worker.coresFree > 0 && worker.state ==
WorkerState.ALIVE) {
for (app <- waitingApps if app.coresLeft > 0) {
- if (canUse(app, worker)) {
- val coresToUse = math.min(worker.coresFree, app.coresLeft)
- if (coresToUse > 0) {
- val exec = app.addExecutor(worker, coresToUse)
- launchExecutor(worker, exec)
- app.state = ApplicationState.RUNNING
- }
- }
+ allocateWorkerResourceToExecutors(app, app.coresLeft, worker)
}
}
}
}
- private def launchExecutor(worker: WorkerInfo, exec: ExecutorDesc) {
+ /**
+ * allocate resources in a certain worker to one or more executors
+ * @param app the info of the application which the executors belong to
+ * @param coresDemand the total number of cores to be allocated to this
application
--- End diff --
More specifically, this should be "cores on this worker to be allocated to
this application". I would rename this variable to `coresToAllocate`
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