chetanmeh 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_r326205999
##########
File path:
common/scala/src/main/scala/org/apache/openwhisk/core/connector/Message.scala
##########
@@ -64,100 +64,165 @@ 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
+
+ /** Pithy descriptor for logging. */
+ def name: String
+
+ /** Does message indicate slot is free? */
+ def isSlotFree: Option[InvokerInstanceId]
+
+ /** Does message contain a result? */
+ def result: Option[Either[ActivationId, WhiskActivation]]
+
+ /**
+ * Is the acknowledgement for an activation that failed internally?
+ * For some message, this is not relevant and the result is None.
+ */
+ def isSystemError: Option[Boolean]
+
+ def activationId: ActivationId
+
+ /** Serializes the message to JSON. */
+ def toJson: JsValue
+
+ /**
+ * Converts the message to a more compact form if it cannot cross the
message bus as is or some of its details are not necessary.
+ */
+ def shrink: AcknowledegmentMessage
}
/**
- * 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 in situtations when
the resource slot and the action
+ * result are available at the same time, and so the split-phase notification
is not necessary. Instead the message
+ * combines the `CompletionMessage` and `ResultMessage`. The `response` may be
an `ActivationId` to allow for failures
+ * to send the activation result because of event-bus size limitations.
*/
-case class CompletionMessage(override val transid: TransactionId,
- activationId: ActivationId,
- isSystemError: Boolean,
- invoker: InvokerInstanceId)
+case class CombinedCompletionAndResultMessage(override val transid:
TransactionId,
+ response: Either[ActivationId,
WhiskActivation],
+ override val isSystemError:
Option[Boolean],
+ invoker: InvokerInstanceId)
extends AcknowledegmentMessage(transid) {
-
- override def toString = {
- activationId.asString
- }
+ override def name = "combined"
+ override def result = Some(response)
+ override def isSlotFree = Some(invoker)
+ override def activationId = response.fold(identity, _.activationId)
+ override def toJson = CombinedCompletionAndResultMessage.serdes.write(this)
+ override def shrink = copy(response = response.flatMap(a =>
Left(a.activationId)))
+ override def toString = response.fold(identity, _.activationId).asString
}
-object CompletionMessage extends DefaultJsonProtocol {
- def parse(msg: String): Try[CompletionMessage] =
Try(serdes.read(msg.parseJson))
- implicit val serdes = jsonFormat4(CompletionMessage.apply)
+/**
+ * This message is sent from an invoker to the controller, once the resource
slot in the invoker (used by the
+ * corresponding activation) free again (i.e., after log collection). The
`CompletionMessage` is part of a split
+ * phase notification to the load balancer where an invoker first sends a
`ResultMessage` and later sends the
+ * `CompletionMessage`.
+ */
+case class CompletionMessage(override val transid: TransactionId,
+ override val activationId: ActivationId,
+ override val isSystemError: Option[Boolean],
+ invoker: InvokerInstanceId)
+ extends AcknowledegmentMessage(transid) {
+ override def name = "completion"
+ override def result = None
+ override def isSlotFree = Some(invoker)
+ override def toJson = CompletionMessage.serdes.write(this)
+ override def shrink = this
+ override def toString = activationId.asString
}
/**
- * That message will be sent from the invoker to the controller after action
completion if the user wants to have
- * the result immediately (blocking activation).
- * When adding fields, the serdes of the companion object must be updated also.
- * The whisk activation field will have its logs stripped.
+ * This message is sent from an invoker to the load balancer once an action
result is available for blocking actions.
+ * This is part of a split phase notification, and does not indicate that the
slot is available, which is indicated with
+ * a `CompletionMessage`. Note that activation record will not contain any
logs from the action execution, only the result.
*/
case class ResultMessage(override val transid: TransactionId, response:
Either[ActivationId, WhiskActivation])
Review comment:
Thats the Right thing to do !!
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