[GitHub] [openwhisk] bdoyle0182 commented on a change in pull request #5061: [New Scheduler] Implement InvokerHealthyManager

[GitBox <gi...@apache.org>]

bdoyle0182 commented on a change in pull request #5061:
URL: https://github.com/apache/openwhisk/pull/5061#discussion_r586756142



##########
File path: core/invoker/src/main/scala/org/apache/openwhisk/core/containerpool/v2/InvokerHealthyManager.scala
##########
@@ -0,0 +1,384 @@
+/*
+ * 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.v2
+
+import akka.actor.Status.{Failure => FailureMessage}
+import akka.actor.{Actor, ActorRef, ActorRefFactory, ActorSystem, FSM, Props, Stash}
+import akka.util.Timeout
+import org.apache.openwhisk.common._
+import org.apache.openwhisk.core.connector._
+import org.apache.openwhisk.core.database.{ArtifactStore, NoDocumentException}
+import org.apache.openwhisk.core.entitlement.Privilege
+import org.apache.openwhisk.core.entity.size._
+import org.apache.openwhisk.core.entity.types.EntityStore
+import org.apache.openwhisk.core.entity.{ActivationResponse => _, _}
+import org.apache.openwhisk.core.etcd.EtcdKV.InvokerKeys
+import org.apache.openwhisk.core.service.UpdateDataOnChange
+
+import scala.concurrent.duration._
+import scala.concurrent.{ExecutionContext, Future}
+import scala.util.{Failure, Success}
+
+class InvokerHealthManager(instanceId: InvokerInstanceId,
+                           healthContainerProxyFactory: (ActorRefFactory, ActorRef) => ActorRef,
+                           dataManagementService: ActorRef,
+                           entityStore: ArtifactStore[WhiskEntity])(implicit actorSystem: ActorSystem, logging: Logging)
+    extends FSM[InvokerState, InvokerHealthData]
+    with Stash {
+
+  implicit val requestTimeout = Timeout(5.seconds)
+  implicit val ec: ExecutionContext = actorSystem.dispatcher
+  implicit val transid: TransactionId = TransactionId.invokerHealth
+
+  private[containerpool] var healthActionProxy: Option[ActorRef] = None
+
+  startWith(
+    Offline,
+    InvokerInfo(
+      new RingBuffer[Boolean](InvokerHealthManager.bufferSize),
+      memory = MemoryInfo(instanceId.userMemory.toMB, 0, 0)))
+
+  when(Offline) {
+    case Event(GracefulShutdown, _: InvokerInfo) =>
+      logging.warn(this, "Received a graceful shutdown flag, stopping the invoker.")
+      stay
+
+    case Event(Enable, _) =>
+      InvokerHealthManager.prepare(entityStore, instanceId).map { _ =>
+        startTestAction(self)
+      }
+      goto(Unhealthy)
+  }
+
+  when(Unhealthy) {
+    case Event(ContainerRemoved, _) =>
+      healthActionProxy = None
+      startTestAction(self)
+      stay
+
+    case Event(msg: FailureMessage, _) =>
+      logging.error(this, s"invoker${instanceId}, status:${stateName} got a failure message: ${msg}")
+      stay
+
+    case Event(ContainerCreationFailed(_), _) =>
+      stay
+  }
+
+  when(Healthy) {
+    case Event(msg: FailureMessage, _) =>
+      logging.error(this, s"invoker${instanceId}, status:${stateName} got a failure message: ${msg}")
+      goto(Unhealthy)
+  }
+
+  whenUnhandled {
+    case Event(_: Initialized, _) =>
+      // Initialized messages sent by ContainerProxy for HealthManger
+      stay()
+
+    case Event(ContainerRemoved, _) =>
+      // Drop messages sent by ContainerProxy for HealthManger
+      healthActionProxy = None
+      stay()
+
+    case Event(GracefulShutdown, _) =>
+      self ! GracefulShutdown
+      goto(Offline)
+
+    case Event(healthMsg: HealthMessage, data: InvokerInfo) =>
+      if (stateName != Offline) {
+        handleHealthMessage(healthMsg.state, data.buffer)
+      } else {
+        stay
+      }
+
+    case Event(memoryInfo: MemoryInfo, data: InvokerInfo) =>
+      publishHealthStatusAndStay(stateName, data.copy(memory = memoryInfo))
+
+    // in case of StatusRuntimeException: NOT_FOUND: etcdserver: requested lease not found, we need to get the lease again.
+    case Event(t: FailureMessage, _) =>
+      logging.error(this, s"Failure happens, restart InvokerHealthManager: ${t}")
+      goto(Offline)
+  }
+
+  // It is important to note that stateName and the stateData in onTransition callback refer to the previous one.
+  // We should access to the next data with nextStateData
+  onTransition {
+    case Offline -> Unhealthy =>
+      publishHealthStatusAndStay(Unhealthy, nextStateData)
+
+    case Healthy -> Unhealthy =>
+      unstashAll()
+      transid.mark(
+        this,
+        LoggingMarkers.LOADBALANCER_INVOKER_STATUS_CHANGE(Unhealthy.asString),
+        s"invoker${instanceId.toInt} is unhealthy",
+        akka.event.Logging.WarningLevel)
+      startTestAction(self)
+      publishHealthStatusAndStay(Unhealthy, nextStateData)
+
+    case _ -> Healthy =>
+      logging.info(this, s"invoker became healthy, stop health action proxy.")
+      unstashAll()
+      stopTestAction()
+
+      publishHealthStatusAndStay(Healthy, nextStateData)
+
+    case Offline -> Offline =>

Review comment:
       nit: can't this be removed? you can just leave out state transitions that don't do anything for this partial function




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