michaeljmarshall commented on a change in pull request #14176:
URL: https://github.com/apache/pulsar/pull/14176#discussion_r801966315



##########
File path: 
pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/AbstractMetadataStore.java
##########
@@ -77,6 +78,8 @@
     protected AbstractMetadataStore() {
         this.executor = Executors
                 .newSingleThreadScheduledExecutor(new 
DefaultThreadFactory("metadata-store"));
+        this.listenerExecutor = Executors
+                .newSingleThreadScheduledExecutor(new 
DefaultThreadFactory("metadata-store-listener"));

Review comment:
       Thanks for that reference Matteo. Is there any value in adding an extra 
thread just in case a blocking method is inadvertently added back onto this 
calling thread? The risk seems high, considering we'd be blocking the zk 
notification handling thread.




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