ddragosd commented on a change in pull request #4326: Invoker backpressure URL: https://github.com/apache/incubator-openwhisk/pull/4326#discussion_r268280226
########## File path: core/invoker/src/main/scala/org/apache/openwhisk/core/containerpool/AkkaClusterContainerResourceManager.scala ########## @@ -0,0 +1,376 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.openwhisk.core.containerpool +import akka.Done +import akka.actor.Actor +import akka.actor.ActorRef +import akka.actor.ActorSystem +import akka.actor.CoordinatedShutdown +import akka.actor.Props +import akka.cluster.Cluster +import akka.cluster.ddata.DistributedData +import akka.cluster.ddata.LWWRegister +import akka.cluster.ddata.LWWRegisterKey +import akka.cluster.ddata.ORSet +import akka.cluster.ddata.ORSetKey +import akka.cluster.ddata.Replicator.Changed +import akka.cluster.ddata.Replicator.Subscribe +import akka.cluster.ddata.Replicator.Unsubscribe +import akka.cluster.ddata.Replicator.Update +import akka.cluster.ddata.Replicator.UpdateFailure +import akka.cluster.ddata.Replicator.UpdateSuccess +import akka.cluster.ddata.Replicator.WriteLocal +import akka.cluster.pubsub.DistributedPubSub +import akka.cluster.pubsub.DistributedPubSubMediator.Put +import akka.cluster.pubsub.DistributedPubSubMediator.Send +import java.time.Instant +import org.apache.openwhisk.common.Logging +import org.apache.openwhisk.core.entity.ByteSize +import org.apache.openwhisk.core.entity.InvokerInstanceId +import org.apache.openwhisk.core.entity.size._ +import org.apache.openwhisk.utils.NodeStats +import org.apache.openwhisk.utils.NodeStatsUpdate +import scala.collection.immutable +import scala.collection.mutable.ListBuffer +import scala.concurrent.Future +import scala.concurrent.duration._ +import scala.util.Try + +class AkkaClusterContainerResourceManager(system: ActorSystem, + instanceId: InvokerInstanceId, + poolActor: ActorRef, + poolConfig: ContainerPoolConfig)(implicit logging: Logging) + extends ContainerResourceManager { + + /** cluster state tracking */ + private var localReservations: Map[ActorRef, Reservation] = Map.empty //this pool's own reservations + private var remoteReservations: Map[Int, List[Reservation]] = Map.empty //other pool's reservations + private var localUnused: Map[ActorRef, ContainerData] = Map.empty // this pool's unused containers + private var remoteUnused + : Map[Int, List[RemoteContainerRef]] = Map.empty //invoker akka address -> List[RemoteContainerRef] + + var clusterActionHostStats = Map.empty[String, NodeStats] //track the most recent node stats per action host (host that is able to run action containers) + var clusterActionHostsCount = 0 + var prewarmsInitialized = false + val clusterPoolData: ActorRef = + system.actorOf( + Props(new ContainerPoolClusterData(instanceId, poolActor)), + ContainerPoolClusterData.clusterPoolActorName(instanceId.toInt)) + + //invoker keys + val InvokerIdsKey = ORSetKey[Int]("invokerIds") + //my keys + val myId = instanceId.toInt + val myReservationsKey = LWWRegisterKey[List[Reservation]]("reservation" + myId) + val myUnusedKey = LWWRegisterKey[List[RemoteContainerRef]]("unused" + myId) + //remote keys + var reservationKeys: immutable.Map[Int, LWWRegisterKey[List[Reservation]]] = Map.empty + var unusedKeys: immutable.Map[Int, LWWRegisterKey[List[RemoteContainerRef]]] = Map.empty + + //cachedValues + var idMap: immutable.Set[Int] = Set.empty + + def activationStartLogMessage(): String = + s"node stats ${clusterActionHostStats} reserved ${localReservations.size} (of max ${poolConfig.clusterManagedResourceMaxStarts}) containers ${reservedSize}MB " + + s"${reservedStartCount} pending starts ${reservedStopCount} pending stops " + + s"${scheduledStartCount} scheduled starts ${scheduledStopCount} scheduled stops" + + def rescheduleLogMessage() = { + s"reservations: ${localReservations.size}" + } + + def requestSpace(size: ByteSize) = { + val bufferedSize = size * 10 //request 10x the required space to allow for failures and additional traffic + //find idles up to this size + val removable = remoteUnused.map(u => u._2.map(u._1 -> _)).flatten.to[ListBuffer] + val removed = remove(removable, bufferedSize) //add some buffer so that any accumulating activations will have better chance + if (removed.nonEmpty) { + val removing = removed.groupBy(_._1).map(k => k._1 -> k._2.map(_._2)) //group the removables by invoker, will send single message per invoker + logging.info(this, s"requesting removal of ${removed.size} eligible idle containers ${removing}") + removing.foreach { r => + clusterPoolData ! RequestReleaseFree(r._1, r._2) + //update unusedPool (we won't ask them to be removed twice) + remoteUnused = remoteUnused + (r._1 -> remoteUnused(r._1).filterNot(r._2.toSet)) + + } + } + + } + + def reservedSize = localReservations.values.map(_.size.toMB).sum + def remoteReservedSize = remoteReservations.values.map(_.map(_.size.toMB).sum).sum + def reservedStartCount = localReservations.values.count { + case p: Reservation => p.size.toMB >= 0 + case _ => false + } + def reservedStopCount = localReservations.values.count { + case p: Reservation => p.size.toMB < 0 + case _ => false + } + def scheduledStartCount = localReservations.values.count { + case p: Reservation => p.size.toMB >= 0 + case _ => false + } + def scheduledStopCount = localReservations.values.count { + case p: Reservation => p.size.toMB < 0 + case _ => false + } + private var clusterResourcesAvailable + : Boolean = false //track to log whenever there is a switch from cluster resources being available to not being available + + def canLaunch(memory: ByteSize, poolMemory: Long, poolConfig: ContainerPoolConfig): Boolean = { + + val localRes = localReservations.values.map(_.size) //active local reservations + val remoteRes = remoteReservations.values.toList.flatten.map(_.size) //remote/stale reservations + + val allRes = localRes ++ remoteRes + //make sure there is at least one node with unreserved mem > memory + val canLaunch = clusterHasPotentialMemoryCapacity(memory.toMB, allRes) //consider all reservations blocking till they are removed during NodeStatsUpdate Review comment: > If there are more resource types to consider in the future ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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