JooHyukKim commented on code in PR #20242:
URL: https://github.com/apache/pulsar/pull/20242#discussion_r1186873025


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerImpl.java:
##########
@@ -2153,9 +2153,14 @@ private CompletableFuture<Void> seekAsyncInternal(long 
requestId, ByteBuf seek,
 
         MessageIdAdv originSeekMessageId = seekMessageId;
         seekMessageId = (MessageIdAdv) seekId;
-        duringSeek.set(true);
+        
+        if (!duringSeek.compareAndSet(false, true)) {
+            log.warn("[{}][{}] Attempting to seek operation that is already in 
progress, cancelling {}", 
+                    topic, subscription, seekBy);
+            seekFuture.cancel(true);

Review Comment:
   But then again, completing with `null` will not set the message clear. I 
think we should just cancel the `seekFuture`. 



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