kirktrue commented on code in PR #14406:
URL: https://github.com/apache/kafka/pull/14406#discussion_r1346545044


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/FetchBuffer.java:
##########
@@ -37,7 +36,7 @@
  *
  * <em>Note</em>: this class is not thread-safe and is intended to only be 
used from a single thread.
  */
-public class FetchBuffer implements Closeable {
+public class FetchBuffer implements AutoCloseable {

Review Comment:
   For point #1, the background thread has a _separate_ fetch buffer. It 
doesn't write to the same object. The application thread `FetchBuffer` is 
created in `PrototypeAsyncConsumer` and the background thread `FetchBuffer` is 
created in `AbstractFetch`.
   
   For point #2, I think your [other 
comment](https://github.com/apache/kafka/pull/14406#discussion_r1342984775) is 
correct. I'm not yet sure how to maintain those two fetch buffers separately 
without running into that race condition.



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