narendly commented on a change in pull request #1033:
URL: https://github.com/apache/helix/pull/1033#discussion_r431541207
##########
File path:
helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixManager.java
##########
@@ -591,8 +591,11 @@ public void
addCurrentStateChangeListener(org.apache.helix.CurrentStateChangeLis
@Override
public void
addCustomizedStateRootChangeListener(CustomizedStateRootChangeListener listener,
String instanceName) throws Exception {
- addListener(listener, new
Builder(_clusterName).customizedStatesRoot(instanceName),
- ChangeType.CUSTOMIZED_STATE_ROOT, new
EventType[]{EventType.NodeChildrenChanged});
+ PropertyKey propertyKey =
_dataAccessor.keyBuilder().customizedStatesRoot(instanceName);
+ if (_zkclient.exists(propertyKey.getPath())) {
Review comment:
exists() check is not a heavyweight ZK operation and considering we only
call this when there's a LiveInstance change (or periodic rebalance), I don't
think performance is a concern here.
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