rabbah commented on a change in pull request #4624: Combines active ack and 
slot release when both are available.
URL: https://github.com/apache/openwhisk/pull/4624#discussion_r325159952
 
 

 ##########
 File path: 
common/scala/src/main/scala/org/apache/openwhisk/core/connector/Message.scala
 ##########
 @@ -64,43 +64,34 @@ case class ActivationMessage(override val transid: 
TransactionId,
   def causedBySequence: Boolean = cause.isDefined
 }
 
-object ActivationMessage extends DefaultJsonProtocol {
-
-  def parse(msg: String) = Try(serdes.read(msg.parseJson))
-
-  private implicit val fqnSerdes = FullyQualifiedEntityName.serdes
-  implicit val serdes = jsonFormat11(ActivationMessage.apply)
-}
-
 /**
  * Message that is sent from the invoker to the controller after action is 
completed or after slot is free again for
  * new actions.
  */
 abstract class AcknowledegmentMessage(private val tid: TransactionId) extends 
Message {
   override val transid: TransactionId = tid
-  override def serialize: String = {
-    AcknowledegmentMessage.serdes.write(this).compactPrint
-  }
+  override def serialize: String = 
AcknowledegmentMessage.serdes.write(this).compactPrint
+  def toJson: JsValue
 }
 
 /**
- * This message is sent from the invoker to the controller, after the slot of 
an invoker that has been used by the
- * current action, is free again (after log collection)
+ * This message is sent from an invoker to the controller, after the resource 
slot in the invoke, used by the
+ * corresponding activation, is free again (i.e., after log collection). In 
some cases, the activation result is
+ * ready and the slot is freed at the same time. In such cases, the completion 
message carries the result as well.
+ * This is reflected by the of a Right() `response` and the param `result` is 
set to true.
+ * In some cases the `result` is true but the response is Left() if the 
message was too large for the message bus.
  */
 case class CompletionMessage(override val transid: TransactionId,
-                             activationId: ActivationId,
-                             isSystemError: Boolean,
+                             response: Either[ActivationId, WhiskActivation],
+                             result: Boolean, // true iff the message is a 
combined active ack and slot released
 
 Review comment:
   > part of a "system upgrade" documentation?
   
   this project doesn't have any yet - are you proposing we start one? ;)
   
   If we introduce a third type, then new invokers could send messages for the 
bug fix, but an old controller would still ignore them (in fact it would be 
worse since then the slot release is not recorded)... We could send 2 messages 
to replicate the split phase notification, but this is wasteful IMO, but then 
avoid the compatibility issue for a rolling update.
   
   Do you want this PR to address this?

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