jeffkbkim commented on code in PR #14885:
URL: https://github.com/apache/kafka/pull/14885#discussion_r1412575325
##########
core/src/main/scala/kafka/coordinator/group/CoordinatorPartitionWriter.scala:
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@@ -66,6 +65,10 @@ class CoordinatorPartitionWriter[T](
compressionType: CompressionType,
time: Time
) extends PartitionWriter[T] {
+ private val threadLocalBufferSupplier = ThreadLocal.withInitial(
+ () => new BufferSupplier.GrowableBufferSupplier()
+ )
Review Comment:
some general questions for my understanding:
1. We are introducing a buffer supplier so that we can reuse the same buffer
and not reallocate a new buffer each time.
2. It's a growable buffer supplier since maxBatchSize may change on
subsequent append()
3. we're adding a try-finally block to always clear the buffer in the case
of exceptions. this was not needed previously since we were not using a buffer
supplier
4. it's a thread local supplier because we don't want the buffer to be
reused across different threads - i don't think i fully understand the
repercussions
is 1-3 correct? 4 is the actual question. thanks!
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