jolshan commented on code in PR #14885:
URL: https://github.com/apache/kafka/pull/14885#discussion_r1414500105
##########
core/src/main/scala/kafka/coordinator/group/CoordinatorPartitionWriter.scala:
##########
@@ -66,6 +65,10 @@ class CoordinatorPartitionWriter[T](
compressionType: CompressionType,
time: Time
) extends PartitionWriter[T] {
+ private val threadLocalBufferSupplier = ThreadLocal.withInitial(
+ () => new BufferSupplier.GrowableBufferSupplier()
+ )
Review Comment:
For more context on 4. There are assumptions in the code that a request is
handled on the same thread.
There was a bug in KIP-890 (see
[here](https://issues.apache.org/jira/browse/KAFKA-15653)) where we used the
wrong byte buffer and it caused NPEs and other exceptions.
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