ccding commented on a change in pull request #11080:
URL: https://github.com/apache/kafka/pull/11080#discussion_r672758944



##########
File path: 
clients/src/main/java/org/apache/kafka/common/record/DefaultRecord.java
##########
@@ -293,7 +293,9 @@ public static DefaultRecord readFrom(ByteBuffer buffer,
                                          Long logAppendTime) {
         int sizeOfBodyInBytes = ByteUtils.readVarint(buffer);
         if (buffer.remaining() < sizeOfBodyInBytes)
-            return null;
+            throw new InvalidRecordException("Invalid record size: expected " 
+ sizeOfBodyInBytes +
+                " bytes in record payload, but instead the buffer has only " + 
buffer.remaining() +
+                " remaining bytes.");

Review comment:
       Are you saying the case that we are yet to complete reading the request? 
I didn't see a retry path, but it will cause a null point exception at 
https://github.com/apache/kafka/blob/bfc57aa4ddcd719fc4a646c2ac09d4979c076455/core/src/main/scala/kafka/log/LogValidator.scala#L191
   
   What do you suggest me do here?

##########
File path: 
clients/src/main/java/org/apache/kafka/common/record/DefaultRecord.java
##########
@@ -293,7 +293,9 @@ public static DefaultRecord readFrom(ByteBuffer buffer,
                                          Long logAppendTime) {
         int sizeOfBodyInBytes = ByteUtils.readVarint(buffer);
         if (buffer.remaining() < sizeOfBodyInBytes)
-            return null;
+            throw new InvalidRecordException("Invalid record size: expected " 
+ sizeOfBodyInBytes +
+                " bytes in record payload, but instead the buffer has only " + 
buffer.remaining() +
+                " remaining bytes.");

Review comment:
       Are you saying the case that we are yet to complete reading the request? 
I didn't see a retry path, but it will cause a null point exception at 
https://github.com/apache/kafka/blob/bfc57aa4ddcd719fc4a646c2ac09d4979c076455/core/src/main/scala/kafka/log/LogValidator.scala#L191
   
   What do you suggest I do here?




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