tillrohrmann commented on a change in pull request #7665: [FLINK-11551][rpc]
Allow RpcEndpoint to execute asynchronous stop operations
URL: https://github.com/apache/flink/pull/7665#discussion_r255961369
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/rpc/akka/AkkaRpcActor.java
##########
@@ -183,6 +176,64 @@ protected void handleRpcMessage(Object message) {
}
}
+ private void handleControlMessage(ControlMessages controlMessage) {
+ switch (controlMessage) {
+ case START:
+ if (state == State.STOPPED) {
+ state = State.STARTED;
+ } else {
+ logStateTransitionWarning(state,
State.STARTED);
+ }
+ break;
+ case STOP:
+ if (state == State.STARTED) {
+ state = State.STOPPED;
+ } else {
+ logStateTransitionWarning(state,
State.STOPPED);
+ }
+ break;
+ case TERMINATE:
+ terminateRpcActor();
+ break;
+ default:
+ final String message = String.format("Received
unknown control message %s. Dropping this message!", controlMessage);
+ log.warn(message);
+ sendErrorIfSender(new
AkkaUnknownMessageException(message));
+ }
+ }
+
+ private void logStateTransitionWarning(State currentState, State
targetState) {
+ log.warn("AkkaRpcActor is currently in state {} and cannot go
into state {}.", currentState, targetState);
+ }
+
+ private void terminateRpcActor() {
+ if (state == State.STOPPED) {
+ state = State.TERMINATING;
+
+ rpcEndpointTerminationFuture =
CompletableFuture.completedFuture(null);
+ getSelf().tell(Kill.getInstance(), ActorRef.noSender());
+ } else if (state == State.STARTED) {
+ state = State.TERMINATING;
+
+ mainThreadValidator.enterMainThread();
+
+ try {
+ rpcEndpointTerminationFuture =
rpcEndpoint.onStop();
+ } finally {
+ mainThreadValidator.exitMainThread();
Review comment:
I guess this should be ok, since it should indicate two independent issues.
The one is the `onStop` failure which won't be properly reported and the other
one the main thread constraint. Unless the former does not influence the
latter, I think it is ok that way.
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