XComp commented on code in PR #22422:
URL: https://github.com/apache/flink/pull/22422#discussion_r1175063876
##########
flink-runtime/src/main/java/org/apache/flink/runtime/leaderelection/LeaderElectionEventHandler.java:
##########
@@ -39,12 +40,29 @@ public interface LeaderElectionEventHandler {
*/
void onGrantLeadership(UUID newLeaderSessionId);
+ /**
+ * Called by specific {@link LeaderElectionDriver} when the leadership is
granted.
+ *
+ * <p>This method will trigger the grant event processing in a separate
thread.
+ *
+ * @param newLeaderSessionId the valid leader session id
+ */
+ CompletableFuture<Void> onGrantLeadershipAsync(UUID newLeaderSessionId);
Review Comment:
No, we don't. Initially, I wanted to avoid having two separate thread
involved in the event processing (the one in the driver and the one in the
`DefaultLeaderElectionService`). My concern was that we would destroy the order
of the events while handling them in separate threads. But I noticed that this
is not the case. The only premise is that the event handling methods are always
called from the same thread. We could go ahead and add a single thread to
`DefaultLeaderElectionService` and even leave the thread handling in
`DefaultMultipleComponentLeaderElectionService` (to keep this PR as small as
possible).
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