zentol commented on code in PR #22422:
URL: https://github.com/apache/flink/pull/22422#discussion_r1173801508
##########
flink-runtime/src/main/java/org/apache/flink/runtime/leaderelection/LeaderElectionEventHandler.java:
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@@ -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:
What's the long-term plan here; will we keep both variants and everything
has to support both? Or will we drop the sync variants once we remove legacy
stuff?
Can we enforce somehow that only a specific variant is called for a given
implementation?
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