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From GitBox <...@apache.org>
Subject [GitHub] tillrohrmann commented on a change in pull request #6464: [FLINK-9936][mesos] WIP
Date Fri, 03 Aug 2018 07:37:13 GMT
tillrohrmann commented on a change in pull request #6464: [FLINK-9936][mesos] WIP 
URL: https://github.com/apache/flink/pull/6464#discussion_r207463934

 File path: flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/ResourceManager.java
 @@ -894,17 +900,21 @@ public void grantLeadership(final UUID newLeaderSessionID) {
 				// clear the state if we've been the leader before
 				if (getFencingToken() != null) {
-					clearState();
+					clearStateInternal();
 				slotManager.start(getFencingToken(), getMainThreadExecutor(), new ResourceActionsImpl());
-				getRpcService().execute(
-					() ->
+				prepareLeadershipAsync()
+					.exceptionally(t -> {
+						onFatalError(t);
+						return null;
+					})
+					.thenRunAsync(() ->
 						// confirming the leader session ID might be blocking,
-						leaderElectionService.confirmLeaderSessionID(newLeaderSessionID));
+						leaderElectionService.confirmLeaderSessionID(newLeaderSessionID), getRpcService().getExecutor());
 Review comment:
   The check would help to guard against a concurrent revoke leadership which is triggered
just before the aynchronous grant leadership call is executed. That way we would not unnecessarily
initialize internal components which would be stopped by the revoke leadership async callback.
At the moment this is not very likely to happen but if we make `clearState` asynchronous and
wait in the `grantLeadership` method to complete the cleanup before calling the leadership
callback, it gets more and more likely.

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