kaisun2000 commented on a change in pull request #1035:
URL: https://github.com/apache/helix/pull/1035#discussion_r432174399



##########
File path: 
zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
##########
@@ -1858,24 +1923,47 @@ public Object call() throws Exception {
     });
   }
 
+  private boolean watchForData(final String path, boolean 
skipWatchingNodeNotExist) {
+    try {
+      if (skipWatchingNodeNotExist) {
+        Stat stat = new Stat();

Review comment:
       getData will return stat too. 
   `retryUntilConnected(() -> (((ZkConnection) 
getConnection()).getZookeeper().getData(path, true, stat)));`
   
   Here, we can't pass null to getData(). It would throw exception when getData 
try to fill data into stat. 




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