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SPARK-1171: when executor is removed, we should minus totalCores instead of just freeCores on that executor #63

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SPARK-1171: when executor is removed, we should minus totalCores instead of just freeCores on that executor #63

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0c0e409
simplify the implementation of CoarseGrainedSchedulerBackend
CodingCat Mar 3, 2014
af470d3
style fix
CodingCat Mar 3, 2014
43c13e9
keep WorkerOffer immutable
CodingCat Mar 4, 2014
19c2bb4
use copy idiom to reconstruct the workerOffers
CodingCat Mar 4, 2014
f6bf93f
code clean
CodingCat Mar 4, 2014
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2 changes: 1 addition & 1 deletion core/src/main/scala/org/apache/spark/scheduler/WorkerOffer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -21,4 +21,4 @@ package org.apache.spark.scheduler
* Represents free resources available on an executor.
*/
private[spark]
class WorkerOffer(val executorId: String, val host: String, val cores: Int)
case class WorkerOffer(executorId: String, host: String, cores: Int);
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superfluous ';'

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oops, sorry, fixed

28 changes: 16 additions & 12 deletions core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
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Expand Up @@ -51,9 +51,9 @@ class CoarseGrainedSchedulerBackend(scheduler: TaskSchedulerImpl, actorSystem: A

class DriverActor(sparkProperties: Seq[(String, String)]) extends Actor {
private val executorActor = new HashMap[String, ActorRef]
private val executorAddress = new HashMap[String, Address]
private val executorHost = new HashMap[String, String]
private val workerOffers = new HashMap[String, WorkerOffer]
private val freeCores = new HashMap[String, Int]
private val totalCores = new HashMap[String, Int]
private val addressToExecutorId = new HashMap[Address, String]

override def preStart() {
Expand All @@ -75,9 +75,10 @@ class CoarseGrainedSchedulerBackend(scheduler: TaskSchedulerImpl, actorSystem: A
logInfo("Registered executor: " + sender + " with ID " + executorId)
sender ! RegisteredExecutor(sparkProperties)
executorActor(executorId) = sender
executorHost(executorId) = Utils.parseHostPort(hostPort)._1
freeCores(executorId) = cores
executorAddress(executorId) = sender.path.address
workerOffers += (executorId ->
new WorkerOffer(executorId, Utils.parseHostPort(hostPort)._1, cores))
totalCores += (executorId -> cores)
freeCores += (executorId -> cores)
addressToExecutorId(sender.path.address) = executorId
totalCoreCount.addAndGet(cores)
makeOffers()
Expand Down Expand Up @@ -125,14 +126,17 @@ class CoarseGrainedSchedulerBackend(scheduler: TaskSchedulerImpl, actorSystem: A

// Make fake resource offers on all executors
def makeOffers() {
launchTasks(scheduler.resourceOffers(
executorHost.toArray.map {case (id, host) => new WorkerOffer(id, host, freeCores(id))}))
// reconstruct workerOffers
workerOffers.foreach(o => workerOffers(o._1) =
new WorkerOffer(o._1, o._2.host, freeCores(o._1)))
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Now that WorkerOffer is a case class, you can do this and the one in makeOffers with the copy idiom:

workerOffers.keys.foreach { executorId => 
  workerOffers(executorId) = workerOffers(executorId).copy(cores = freeCores(executorId))
}

launchTasks(scheduler.resourceOffers(workerOffers.values.toSeq))
}

// Make fake resource offers on just one executor
def makeOffers(executorId: String) {
launchTasks(scheduler.resourceOffers(
Seq(new WorkerOffer(executorId, executorHost(executorId), freeCores(executorId)))))
val oldOffer = workerOffers(executorId)
workerOffers(executorId) = new WorkerOffer(executorId, oldOffer.host, freeCores(executorId))
launchTasks(scheduler.resourceOffers(Seq(workerOffers(executorId))))
}

// Launch tasks returned by a set of resource offers
Expand All @@ -147,10 +151,10 @@ class CoarseGrainedSchedulerBackend(scheduler: TaskSchedulerImpl, actorSystem: A
def removeExecutor(executorId: String, reason: String) {
if (executorActor.contains(executorId)) {
logInfo("Executor " + executorId + " disconnected, so removing it")
val numCores = freeCores(executorId)
addressToExecutorId -= executorAddress(executorId)
val numCores = totalCores(executorId)
executorActor -= executorId
executorHost -= executorId
workerOffers -= executorId
totalCores -= executorId
freeCores -= executorId
totalCoreCount.addAndGet(-numCores)
scheduler.executorLost(executorId, SlaveLost(reason))
Expand Down