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Subject [GitHub] GJL commented on a change in pull request #6464: [FLINK-9936][mesos] Mesos resource manager unable to connect to master after failover
Date Fri, 03 Aug 2018 12:00:30 GMT
GJL commented on a change in pull request #6464: [FLINK-9936][mesos] Mesos resource manager
unable to connect to master after failover 
URL: https://github.com/apache/flink/pull/6464#discussion_r207522805
 
 

 ##########
 File path: flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/ResourceManager.java
 ##########
 @@ -892,30 +896,48 @@ protected void onFatalError(Throwable t) {
 	 */
 	@Override
 	public void grantLeadership(final UUID newLeaderSessionID) {
-		runAsyncWithoutFencing(
-			() -> {
-				final ResourceManagerId newResourceManagerId = ResourceManagerId.fromUuid(newLeaderSessionID);
-
-				log.info("ResourceManager {} was granted leadership with fencing token {}", getAddress(),
newResourceManagerId);
+		final CompletableFuture<Boolean> acceptLeadershipFuture = CompletableFuture.supplyAsync(
+			() -> tryAcceptLeadership(newLeaderSessionID),
+			getUnfencedMainThreadExecutor()).thenCompose(Function.identity());
+
+		final CompletableFuture<Void> confirmationFuture = acceptLeadershipFuture.thenAcceptAsync(
+			(acceptLeadership) -> {
+				if (acceptLeadership) {
+					// confirming the leader session ID might be blocking,
+					leaderElectionService.confirmLeaderSessionID(newLeaderSessionID);
+				}
+			},
+			getRpcService().getExecutor());
 
-				// clear the state if we've been the leader before
-				if (getFencingToken() != null) {
-					clearStateInternal();
+		confirmationFuture.whenComplete(
+			(Void ignored, Throwable throwable) -> {
+				if (throwable != null) {
+					onFatalError(ExceptionUtils.stripCompletionException(throwable));
 				}
+			});
+	}
 
-				setFencingToken(newResourceManagerId);
+	private CompletableFuture<Boolean> tryAcceptLeadership(final UUID newLeaderSessionID)
{
+		if (leaderElectionService.hasLeadership(newLeaderSessionID)) {
+			final ResourceManagerId newResourceManagerId = ResourceManagerId.fromUuid(newLeaderSessionID);
 
-				slotManager.start(getFencingToken(), getMainThreadExecutor(), new ResourceActionsImpl());
+			log.info("ResourceManager {} was granted leadership with fencing token {}", getAddress(),
newResourceManagerId);
 
-				prepareLeadershipAsync()
-					.thenRunAsync(() ->
-						// confirming the leader session ID might be blocking,
-						leaderElectionService.confirmLeaderSessionID(newLeaderSessionID), getRpcService().getExecutor())
-					.exceptionally(t -> {
-						onFatalError(t);
-						return null;
-					});
-			});
+			// clear the state if we've been the leader before
+			if (getFencingToken() != null) {
+				clearStateInternal();
+			}
+
+			setFencingToken(newResourceManagerId);
+
+			slotManager.start(getFencingToken(), getMainThreadExecutor(), new ResourceActionsImpl());
+
+			return clearStateFuture
 
 Review comment:
   fixed

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