pkuwm commented on a change in pull request #1066:
URL: https://github.com/apache/helix/pull/1066#discussion_r460270771
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File path:
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java
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@@ -312,6 +312,17 @@ private void forceRebalance(HelixManager manager,
ClusterEventType eventType) {
changeContext.setType(NotificationContext.Type.CALLBACK);
String uid = UUID.randomUUID().toString().substring(0, 8);
ClusterEvent event = new ClusterEvent(_clusterName, eventType, uid);
+
+ Optional<String> leaderSession = manager.getSessionIdIfLead();
+ // If session is not present, this cluster manager is not leader for the
cluster.
+ if (!leaderSession.isPresent()) {
+ logger.warn("Cluster manager {} is not leader for {}. Event {} is
discarded.",
+ manager.getInstanceName(), manager.getClusterName(), event);
+ return;
+ }
+
+ // Pipeline should be run and Zk writes should be completed by the event
session.
+ event.addAttribute(AttributeName.EVENT_SESSION.name(),
leaderSession.get());
Review comment:
Since there are 3 places creating new events, I've moved the check to
handleEvent().
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