lhotari commented on code in PR #25805:
URL: https://github.com/apache/pulsar/pull/25805#discussion_r3266011456


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerImpl.java:
##########
@@ -1720,12 +1720,26 @@ private ByteBuf processMessageChunk(ByteBuf 
compressedPayload, MessageMetadata m
      */
     void notifyPendingReceivedCallback(final Message<T> message, Exception 
exception) {
         if (pendingReceives.isEmpty()) {
+            if (getState() != State.Closing && getState() != State.Closed) {
+                log.error().attr("message", message)
+                    .attr("pendingReceives-size", pendingReceives.size())
+                    .log(" If you received this log, it means that you 
encountered a bug: a message was"
+                        + " dropped internally, the client-side will encounter 
a crucial issue: this message will"
+                        + " never be consumed until the consumer is restarted 
or the topic is unloaded.");
+            }
             return;
         }
 
         // fetch receivedCallback from queue
         final CompletableFuture<Message<T>> receivedFuture = 
nextPendingReceive();
         if (receivedFuture == null) {
+            if (getState() != State.Closing && getState() != State.Closed) {
+                log.error().attr("message", message)
+                    .attr("receivedFuture-polled-out", null)

Review Comment:
   what's the meaning of this?
   ```
                       .attr("receivedFuture-polled-out", null)
   ```



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