[GitHub] ddragosd commented on a change in pull request #2531: Share bookkeeping data across controllers

[gi...@git.apache.org]

ddragosd commented on a change in pull request #2531: Share bookkeeping data across controllers
URL: https://github.com/apache/incubator-openwhisk/pull/2531#discussion_r138784709
 
 

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 File path: core/controller/src/main/scala/whisk/core/loadBalancer/SharedDataService.scala
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+/*
+ * 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 whisk.core.loadBalancer
+
+import akka.actor.{Actor, ActorLogging, ActorRef, Props}
+import akka.cluster.Cluster
+import akka.cluster.ClusterEvent.{InitialStateAsEvents, MemberEvent, MemberRemoved, MemberUp, UnreachableMember}
+import akka.cluster.ddata.{DistributedData, PNCounterMap, PNCounterMapKey}
+import akka.cluster.ddata.Replicator._
+import whisk.common.AkkaLogging
+import whisk.core.WhiskConfig
+import com.typesafe.config.{Config, ConfigFactory}
+
+case class IncreaseCounter(key: String, value: Long)
+case class DecreaseCounter(key: String, value: Long)
+case class ReadCounter(key: String)
+case class RemoveCounter(key: String)
+case object GetMap
+
+/**
+ * Companion object to specify actor properties from the outside, e.g. name of the shared map
+ */
+object SharedDataService {
+  val requiredProperties = Map(WhiskConfig.controllerSeedNodes -> null)
+
+  def props(storageName: String): Props = Props(new SharedDataService(storageName))
+
+  /**
+   * Add seed nodes if cluster provider is specified, otherwhise return the existing config.
+   * Parse akka seed nodes this way until either of these 2 issues is resolved:
+   * https://github.com/akka/akka/issues/23600
+   * https://github.com/typesafehub/config/issues/69
+   * @return Updated Config
+   */
+  def addAkkaSeedNodesToConf(whiskConf: WhiskConfig): Config = {
+    val conf = ConfigFactory.load()
+
+    val cluster = conf.getString("akka.actor.provider")
+
+    if (cluster == "cluster") {
+      val seedNodes = whiskConf.controllerSeedNodes
 
 Review comment:
   ?  We know Mesos and Kube are in the picture and it's not a big stretch to provide support to automatically discover seed nodes using the APIs they provide. Mesos could come later as 1 PR and so does Kube, but it would be good to design the code with this in mind.
 
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