jiangpengcheng commented on a change in pull request #5116:
URL: https://github.com/apache/openwhisk/pull/5116#discussion_r638609940



##########
File path: 
core/scheduler/src/main/scala/org/apache/openwhisk/core/scheduler/container/CreationJobManager.scala
##########
@@ -0,0 +1,268 @@
+/*
+ * 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.scheduler.container
+
+import java.nio.charset.StandardCharsets
+import java.util.concurrent.TimeUnit
+import akka.actor.{Actor, ActorRef, ActorRefFactory, ActorSystem, Cancellable, 
Props}
+import org.apache.openwhisk.common.{GracefulShutdown, Logging, TransactionId}
+import org.apache.openwhisk.core.connector._
+import org.apache.openwhisk.core.entity._
+import org.apache.openwhisk.core.etcd.EtcdKV.ContainerKeys.inProgressContainer
+import org.apache.openwhisk.core.scheduler.queue.{MemoryQueueKey, QueuePool}
+import org.apache.openwhisk.core.service.{RegisterData, UnregisterData}
+import org.apache.openwhisk.core.ConfigKeys
+import pureconfig.loadConfigOrThrow
+
+import scala.collection.concurrent.TrieMap
+import scala.concurrent.duration._
+import scala.concurrent.{ExecutionContext, Future}
+
+sealed trait CreationJob
+case class RegisterCreationJob(msg: ContainerCreationMessage) extends 
CreationJob
+case class FinishCreationJob(ack: ContainerCreationAckMessage) extends 
CreationJob
+case class ReschedulingCreationJob(tid: TransactionId,
+                                   creationId: CreationId,
+                                   invocationNamespace: String,
+                                   action: FullyQualifiedEntityName,
+                                   revision: DocRevision,
+                                   actionMetaData: WhiskActionMetaData,
+                                   schedulerHost: String,
+                                   rpcPort: Int,
+                                   retry: Int)
+    extends CreationJob {
+
+  def toCreationMessage(sid: SchedulerInstanceId, retryCount: Int): 
ContainerCreationMessage =
+    ContainerCreationMessage(
+      tid,
+      invocationNamespace,
+      action,
+      revision,
+      actionMetaData,
+      sid,
+      schedulerHost,
+      rpcPort,
+      retryCount,
+      creationId)
+}
+
+abstract class CreationJobState(val creationId: CreationId,
+                                val invocationNamespace: String,
+                                val action: FullyQualifiedEntityName,
+                                val revision: DocRevision)
+case class FailedCreationJob(override val creationId: CreationId,
+                             override val invocationNamespace: String,
+                             override val action: FullyQualifiedEntityName,
+                             override val revision: DocRevision,
+                             error: ContainerCreationError,
+                             message: String)
+    extends CreationJobState(creationId, invocationNamespace, action, revision)
+case class SuccessfulCreationJob(override val creationId: CreationId,
+                                 override val invocationNamespace: String,
+                                 override val action: FullyQualifiedEntityName,
+                                 override val revision: DocRevision)
+    extends CreationJobState(creationId, invocationNamespace, action, revision)
+
+case object GetPoolStatus
+
+case class JobEntry(action: FullyQualifiedEntityName, timer: Cancellable)
+
+class CreationJobManager(feedFactory: (ActorRefFactory, String, Int, 
Array[Byte] => Future[Unit]) => ActorRef,
+                         schedulerInstanceId: SchedulerInstanceId,
+                         dataManagementService: ActorRef)(implicit 
actorSystem: ActorSystem, logging: Logging)
+    extends Actor {
+  private implicit val ec: ExecutionContext = actorSystem.dispatcher
+  private val baseTimeout = 
loadConfigOrThrow[Int](ConfigKeys.schedulerInProgressJobRetentionSecond).seconds
+  private val retryLimit = 5
+  private val retryDelayTime = 100.milliseconds
+
+  /**
+   * Store a JobEntry in local to get an alarm for key timeout
+   * It does not matter whether the information stored in Local is redundant 
or null.
+   * When a new JobEntry is created, it is overwritten if it is duplicated.
+   * If there is no corresponding JobEntry at the time of deletion, nothing is 
done.
+   */
+  protected val creationJobPool = TrieMap[CreationId, JobEntry]()
+
+  override def receive: Receive = {
+    case RegisterCreationJob(
+        ContainerCreationMessage(_, invocationNamespace, action, revision, 
actionMetaData, _, _, _, _, creationId)) =>
+      val isBlackboxInvocation = 
actionMetaData.toExecutableWhiskAction.exists(a => a.exec.pull);
+      registerJob(invocationNamespace, action, revision, creationId, 
isBlackboxInvocation)
+
+    case FinishCreationJob(
+        ContainerCreationAckMessage(
+          tid,
+          creationId,
+          invocationNamespace,
+          action,
+          revision,
+          actionMetaData,
+          _,
+          schedulerHost,
+          rpcPort,
+          retryCount,
+          error,
+          reason)) =>
+      if (error.isEmpty) {
+        logging.info(this, s"[$creationId] create container successfully")
+        deleteJob(
+          invocationNamespace,
+          action,
+          revision,
+          creationId,
+          SuccessfulCreationJob(creationId, invocationNamespace, action, 
revision))
+
+      } else {
+        val cause = reason.getOrElse("unknown reason")
+        // if exceed the retry limit or meet errors which we don't need to 
reschedule, make it a failure
+        if (retryCount >= retryLimit || 
!error.exists(ContainerCreationError.whiskErrors.contains)) {
+          logging.error(
+            this,
+            s"[$creationId] Failed to create container $retryCount/$retryLimit 
times for $cause. Finished creation")
+          // Delete from pool after all retries are failed
+          deleteJob(
+            invocationNamespace,
+            action,
+            revision,
+            creationId,
+            FailedCreationJob(creationId, invocationNamespace, action, 
revision, error.get, cause))
+        } else {
+          // Reschedule
+          logging.error(
+            this,
+            s"[$creationId] Failed to create container $retryCount/$retryLimit 
times for $cause. Started rescheduling")
+          // Add some time interval during retry create container, because 
etcd put operation needs some time if data inconsistant happens
+          actorSystem.scheduler.scheduleOnce(retryDelayTime) {
+            context.parent ! ReschedulingCreationJob(
+              tid,
+              creationId,
+              invocationNamespace,
+              action,
+              revision,
+              actionMetaData,
+              schedulerHost,
+              rpcPort,
+              retryCount)
+          }
+        }
+      }
+
+    case GracefulShutdown =>
+      ackFeed ! GracefulShutdown
+  }
+
+  private def registerJob(invocationNamespace: String,
+                          action: FullyQualifiedEntityName,
+                          revision: DocRevision,
+                          creationId: CreationId,
+                          isBlackboxInvocation: Boolean) = {
+    creationJobPool getOrElseUpdate (creationId, {
+      val key = inProgressContainer(invocationNamespace, action, revision, 
schedulerInstanceId, creationId)
+      dataManagementService ! RegisterData(key, "", failoverEnabled = false)
+      JobEntry(action, createTimer(invocationNamespace, action, revision, 
creationId, isBlackboxInvocation))
+    })
+  }
+
+  private def deleteJob(invocationNamespace: String,
+                        action: FullyQualifiedEntityName,
+                        revision: DocRevision,
+                        creationId: CreationId,
+                        state: CreationJobState) = {
+    val key = inProgressContainer(invocationNamespace, action, revision, 
schedulerInstanceId, creationId)
+
+    // If there is a JobEntry, delete it.
+    creationJobPool
+      .remove(creationId)
+      .foreach(entry => {
+        sendState(state)
+        entry.timer.cancel()
+      })
+
+    dataManagementService ! UnregisterData(key)
+    Future.successful({})
+  }
+
+  private def sendState(state: CreationJobState): Unit = {
+    context.parent ! state // send state to ContainerManager
+    QueuePool.get(MemoryQueueKey(state.invocationNamespace, 
state.action.toDocId.asDocInfo(state.revision))) match {
+      case Some(memoryQueueValue) if memoryQueueValue.isLeader =>
+        memoryQueueValue.queue ! state
+      case _ =>
+        logging.error(this, s"get a $state for a nonexistent memory queue or a 
follower")
+    }
+  }
+
+  protected def createTimer(invocationNamespace: String,
+                            action: FullyQualifiedEntityName,
+                            revision: DocRevision,
+                            creationId: CreationId,
+                            isBlackbox: Boolean): Cancellable = {
+    val timeout = if (isBlackbox) FiniteDuration(baseTimeout.toSeconds * 3, 
TimeUnit.SECONDS) else baseTimeout
+    actorSystem.scheduler.scheduleOnce(timeout) {
+      logging.warn(
+        this,
+        s"Failed to create a container for $action(blackbox: $isBlackbox), 
error: $creationId timed out after $timeout")
+      creationJobPool
+        .remove(creationId)
+        .foreach(
+          _ =>
+            sendState(
+              FailedCreationJob(
+                creationId,
+                invocationNamespace,
+                action,
+                revision,
+                ContainerCreationError.TimeoutError,
+                s"timeout waiting for the ack of $creationId after $timeout")))
+      dataManagementService ! UnregisterData(
+        inProgressContainer(invocationNamespace, action, revision, 
schedulerInstanceId, creationId))
+    }
+  }
+
+  private val topicPrefix = 
loadConfigOrThrow[String](ConfigKeys.kafkaTopicsPrefix)
+  private val topic = 
s"${topicPrefix}creationAck${schedulerInstanceId.asString}"
+  private val maxActiveAcksPerPoll = 128

Review comment:
       it seems other places are also hardcoded




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