ryucc commented on code in PR #1651:
URL: https://github.com/apache/samza/pull/1651#discussion_r1088226536


##########
samza-core/src/main/java/org/apache/samza/zk/ZkLeaderElector.java:
##########
@@ -69,6 +71,7 @@ public ZkLeaderElector(String processorIdStr, ZkUtils 
zkUtils) {
   @VisibleForTesting
   public ZkLeaderElector(String processorIdStr,
                          ZkUtils zkUtils,
+                         @Nonnull
                          IZkDataListener previousProcessorChangeListener) {
     this.processorIdStr = processorIdStr;

Review Comment:
   @mynameborat
   The path forward isn't clear to me.
   
   1. We want to remove the `@NonNull` line
   2. Do we want to remove this constructor?
   3. Need to choose one of the following:
        a. Pass in a non-null ZkDataListener in the tests, or
        b. Use the constructor without the last argument.



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