pkuwm commented on a change in pull request #1066:
URL: https://github.com/apache/helix/pull/1066#discussion_r439057363
##########
File path: helix-core/src/main/java/org/apache/helix/HelixManager.java
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@@ -425,6 +426,20 @@ void
addExternalViewChangeListener(org.apache.helix.ExternalViewChangeListener l
*/
boolean isLeader();
+ /**
+ * Checks whether the cluster manager is leader and sets its ZK session in
param
+ * {@link InstanceLeaderSession} if and only if it is leader.
+ *
+ * @param instanceLeaderSession To include ZK session ID of the cluster
manager in return
+ *
+ * @return true if the instance is a leader of the cluster and Zk session of
the cluster
+ * manager is return in param {@link InstanceLeaderSession}
+ */
+ default boolean isInstanceLeader(InstanceLeaderSession
instanceLeaderSession) {
+ throw new UnsupportedOperationException(
+ "Checking leader and returning session is not supported.");
+ }
Review comment:
@dasahcc An update. I've synced up with @jiajunwang about this. We
decided to change it a bit to `Optional<String> getSessionIdIfLeader()` to
avoid the new wrapper `InstanceLeaderSession`.
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