[fix] [cli] the variable producerName of BatchMsgContainer is null (#20819)

Motivation: If the producer name is generated by the Broker, the producer will update the variable `producerName` after connecting, but not update the same variable of the batch message container.

Modifications: fix bug
(cherry picked from commit aba50f2a276412bc43a4652b9ce303d384f71966)
diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java
index e369e7d..c9d8a2f 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java
@@ -1538,11 +1538,12 @@
         headersAndPayload.resetReaderIndex();
         if (log.isDebugEnabled()) {
             log.debug("[{}] Received send message request. producer: {}:{} {}:{} size: {},"
-                            + " partition key is: {}, ordering key is {}",
+                            + " partition key is: {}, ordering key is {}, uncompressedSize is {}",
                     remoteAddress, send.getProducerId(), send.getSequenceId(), msgMetadata.getProducerName(),
                     msgMetadata.getSequenceId(), headersAndPayload.readableBytes(),
                     msgMetadata.hasPartitionKey() ? msgMetadata.getPartitionKey() : null,
-                    msgMetadata.hasOrderingKey() ? msgMetadata.getOrderingKey() : null);
+                    msgMetadata.hasOrderingKey() ? msgMetadata.getOrderingKey() : null,
+                    msgMetadata.getUncompressedSize());
         }
     }
 
diff --git a/pulsar-client/src/main/java/org/apache/pulsar/client/impl/AbstractBatchMessageContainer.java b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/AbstractBatchMessageContainer.java
index 9b4d1b7..f762b5a 100644
--- a/pulsar-client/src/main/java/org/apache/pulsar/client/impl/AbstractBatchMessageContainer.java
+++ b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/AbstractBatchMessageContainer.java
@@ -35,7 +35,6 @@
     protected CompressionType compressionType;
     protected CompressionCodec compressor;
     protected String topicName;
-    protected String producerName;
     protected ProducerImpl producer;
 
     protected int maxNumMessagesInBatch;
@@ -98,7 +97,6 @@
     public void setProducer(ProducerImpl<?> producer) {
         this.producer = producer;
         this.topicName = producer.getTopic();
-        this.producerName = producer.getProducerName();
         this.compressionType = CompressionCodecProvider
                 .convertToWireProtocol(producer.getConfiguration().getCompressionType());
         this.compressor = CompressionCodecProvider.getCompressionCodec(compressionType);
diff --git a/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageContainerImpl.java b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageContainerImpl.java
index 37b522d..f657816 100644
--- a/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageContainerImpl.java
+++ b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageContainerImpl.java
@@ -80,8 +80,8 @@
     public boolean add(MessageImpl<?> msg, SendCallback callback) {
 
         if (log.isDebugEnabled()) {
-            log.debug("[{}] [{}] add message to batch, num messages in batch so far {}", topicName, producerName,
-                    numMessagesInBatch);
+            log.debug("[{}] [{}] add message to batch, num messages in batch so far {}", topicName,
+                    producer.getProducerName(), numMessagesInBatch);
         }
 
         if (++numMessagesInBatch == 1) {
@@ -193,8 +193,8 @@
                 firstCallback.sendComplete(ex);
             }
         } catch (Throwable t) {
-            log.warn("[{}] [{}] Got exception while completing the callback for msg {}:", topicName, producerName,
-                    lowestSequenceId, t);
+            log.warn("[{}] [{}] Got exception while completing the callback for msg {}:", topicName,
+                    producer.getProducerName(), lowestSequenceId, t);
         }
         clear();
     }
@@ -226,6 +226,14 @@
         ByteBufPair cmd = producer.sendMessage(producer.producerId, messageMetadata.getSequenceId(),
                 messageMetadata.getHighestSequenceId(), numMessagesInBatch, messageMetadata, encryptedPayload);
 
+        if (log.isDebugEnabled()) {
+            log.debug("[{}] [{}] Build batch msg seq:{}, highest-seq:{}, numMessagesInBatch: {}, uncompressedSize: {},"
+                            + " payloadSize: {}", topicName, producer.getProducerName(),
+                    messageMetadata.getSequenceId(), messageMetadata.getNumMessagesInBatch(),
+                    messageMetadata.getHighestSequenceId(),
+                    messageMetadata.getUncompressedSize(), encryptedPayload.readableBytes());
+        }
+
         OpSendMsg op = OpSendMsg.create(messages, cmd, messageMetadata.getSequenceId(),
                 messageMetadata.getHighestSequenceId(), firstCallback);
 
diff --git a/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageKeyBasedContainer.java b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageKeyBasedContainer.java
index 7614728..272f2dd 100644
--- a/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageKeyBasedContainer.java
+++ b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/BatchMessageKeyBasedContainer.java
@@ -54,8 +54,8 @@
     @Override
     public boolean add(MessageImpl<?> msg, SendCallback callback) {
         if (log.isDebugEnabled()) {
-            log.debug("[{}] [{}] add message to batch, num messages in batch so far is {}", topicName, producerName,
-                    numMessagesInBatch);
+            log.debug("[{}] [{}] add message to batch, num messages in batch so far is {}", topicName,
+                    producer.getProducerName(), numMessagesInBatch);
         }
         numMessagesInBatch++;
         currentBatchSizeBytes += msg.getDataBuffer().readableBytes();