Add tags to invokers.

ansible/roles/invoker/tasks/deploy.yml

@@ -282,6 +282,7 @@
       "CONFIG_whisk_invoker_https_keystorePassword": "{{ invoker.ssl.keystore.password }}"
       "CONFIG_whisk_invoker_https_keystoreFlavor": "{{ invoker.ssl.storeFlavor }}"
       "CONFIG_whisk_invoker_https_clientAuth": "{{ invoker.ssl.clientAuth }}"
+      "CONFIG_whisk_invoker_resource_tags": "{% if tags is defined %} '{{ tags | join(',') }}' {% else %} '' {% endif %}"
       "CONFIG_whisk_containerProxy_timeouts_idleContainer": "{{ whisk.containerProxy.timeouts.idleContainer }}"
       "CONFIG_whisk_containerProxy_timeouts_pauseGrace": "{{ whisk.containerProxy.timeouts.pauseGrace  }}"
       "CONFIG_whisk_containerProxy_timeouts_keepingDuration": "{{ whisk.containerProxy.timeouts.keepingDuration }}"

common/scala/src/main/scala/org/apache/openwhisk/core/WhiskConfig.scala

@@ -317,4 +317,6 @@ object ConfigKeys {
 
   val whiskInvokerUsername = "whisk.invoker.username"
   val whiskInvokerPassword = "whisk.invoker.password"
+
+  val invokerResourceTags = "whisk.invoker.resource.tags"
 }

core/invoker/src/main/scala/org/apache/openwhisk/core/invoker/Invoker.scala

@@ -109,7 +109,13 @@ object Invoker {
     implicit val logger = new AkkaLogging(akka.event.Logging.getLogger(actorSystem, this))
     val poolConfig: ContainerPoolConfig = loadConfigOrThrow[ContainerPoolConfig](ConfigKeys.containerPool)
     val limitConfig: ConcurrencyLimitConfig = loadConfigOrThrow[ConcurrencyLimitConfig](ConfigKeys.concurrencyLimit)
+    val tags: Seq[String] = Some(loadConfigOrThrow[String](ConfigKeys.invokerResourceTags))
+      .map(_.trim())
+      .filter(_ != "")
+      .map(_.split(",").toSeq)
+      .getOrElse(Seq.empty[String])
 
+    logger.info(this, s"invoker tags: (${tags.mkString(", ")})")
     // Prepare Kamon shutdown
     CoordinatedShutdown(actorSystem).addTask(CoordinatedShutdown.PhaseActorSystemTerminate, "shutdownKamon") { () =>
       logger.info(this, s"Shutting down Kamon with coordinated shutdown")
@@ -190,7 +196,13 @@ object Invoker {
 
     val maxMessageBytes = Some(ActivationEntityLimit.MAX_ACTIVATION_LIMIT)
     val invokerInstance =
-      InvokerInstanceId(assignedInvokerId, cmdLineArgs.uniqueName, cmdLineArgs.displayedName, poolConfig.userMemory)
+      InvokerInstanceId(
+        assignedInvokerId,
+        cmdLineArgs.uniqueName,
+        cmdLineArgs.displayedName,
+        poolConfig.userMemory,
+        None,
+        tags)
 
     val msgProvider = SpiLoader.get[MessagingProvider]
     if (msgProvider

docs/tag-based-scheduling.md

@@ -0,0 +1,57 @@
+<!--
+#
+# 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.
+#
+-->
+
+# Tag-based Scheduling
+
+Invoker machines may have different resources such as GPU, high CPU, etc.
+For those who want to take advantage of such resources, the system should be able to schedule activations to a certain invoker with the resources.
+
+## Tagging invokers
+
+Operators can configure any tags for invokers.
+
+```bash
+invoker0 ansible_host=${INVOKER0} tags="['v1', 'gpu']"
+invoker1 ansible_host=${INVOKER1} tags="['v1', 'cpu']"
+invoker2 ansible_host=${INVOKER2} tags="['v2', 'gpu']"
+invoker3 ansible_host=${INVOKER3} tags="['v2', 'cpu']"
+invoker4 ansible_host=${INVOKER4} tags="['v1', 'mem']"
+invoker5 ansible_host=${INVOKER5} tags="['v2', 'mem']"
+invoker6 ansible_host=${INVOKER6} tags="['v2']"
+invoker7 ansible_host=${INVOKER7} tags="['v2']"
+invoker8 ansible_host=${INVOKER8}
+invoker9 ansible_host=${INVOKER9}
+```
+
+Users can add the following annotations to their actions.
+
+```
+wsk action update params tests/dat/actions/params.js -i -a invoker-resources '["v2", "gpu"]'
+```
+
+Activation for this action will be delivered to invoker2.
+
+The annotations and the corresponding target invokers are as follows.
+
+* `["v1", "gpu"]` -> `invoker0`
+* `["v2", "gpu"]` -> `invoker2`
+* `["v1", "cpu"]` -> `invoker1`
+* `["v2"]` -> One of `invoker2`, `invoker3`, `invoker5`, `invoker6`, and `invoker7`
+* `["v1"]` -> One of `invoker0`, `invoker1`, `invoker4`
+* `No annotation` -> One of `invoker8` and `invoker9` is chosen first. if they have no resource, choose one of the invokers with tags.