lhotari commented on code in PR #22854:
URL: https://github.com/apache/pulsar/pull/22854#discussion_r1628929247


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/PatternMultiTopicsConsumerImpl.java:
##########
@@ -69,6 +69,31 @@ public class PatternMultiTopicsConsumerImpl<T> extends 
MultiTopicsConsumerImpl<T
     private volatile Timeout recheckPatternTimeout = null;
     private volatile String topicsHash;
 
+    /**
+     * This variable is used to make all tasks that will modify subscriptions 
will be executed one by one.

Review Comment:
   Answering the memory leak question myself: it seems that memory leaks with 
chaining have been addressed a long time ago in the JVM: 
https://stackoverflow.com/a/73157976 . It should be fine to have the solution.



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