shashankhs11 commented on code in PR #20285:
URL: https://github.com/apache/kafka/pull/20285#discussion_r2409093988
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clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java:
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@@ -1072,12 +1073,25 @@ private boolean appendsInProgress() {
*/
public void awaitFlushCompletion() throws InterruptedException {
try {
- // Obtain a copy of all of the incomplete ProduceRequestResult(s)
at the time of the flush.
- // We must be careful not to hold a reference to the
ProduceBatch(s) so that garbage
- // collection can occur on the contents.
- // The sender will remove ProducerBatch(s) from the original
incomplete collection.
- for (ProduceRequestResult result :
this.incomplete.requestResults())
- result.await();
+ // Obtain a snapshot of all record futures at the time of the
flush.
+ // We wait on individual record futures rather than batch-level
futures because
+ // by waiting on record futures, we ensure flush() blocks until
all split
+ // batches complete.
+ //
+ // We first collect all futures into a list first to avoid holding
references to
+ // ProducerBatch objects, allowing them to be garbage collected
after completion.
+ List<FutureRecordMetadata> futures = new ArrayList<>();
+ for (ProducerBatch batch : this.incomplete.copyAll()) {
Review Comment:
`requestResults()` doesn't expose record level futures. They are inside the
private `thunks` list.
That's why I used `copyAll()` to get the actual `ProducerBatch` objects
directly and then extract the record futures.
Is my understanding correct?
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