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https://issues.apache.org/jira/browse/KAFKA-9703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084440#comment-17084440
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ASF GitHub Bot commented on KAFKA-9703:
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becketqin commented on pull request #8286: KAFKA-9703:Free up resources when
splitting huge batches
URL: https://github.com/apache/kafka/pull/8286
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> ProducerBatch.split takes up too many resources if the bigBatch is huge
> -----------------------------------------------------------------------
>
> Key: KAFKA-9703
> URL: https://issues.apache.org/jira/browse/KAFKA-9703
> Project: Kafka
> Issue Type: Bug
> Reporter: jiamei xie
> Priority: Major
>
> ProducerBatch.split takes up too many resources and might cause outOfMemory
> error if the bigBatch is huge. About how I found this issue is in
> https://lists.apache.org/[email protected]:lte=1M:MESSAGE_TOO_LARGE
> Following is the code which takes a lot of resources.
> {code:java}
> for (Record record : recordBatch) {
> assert thunkIter.hasNext();
> Thunk thunk = thunkIter.next();
> if (batch == null)
> batch = createBatchOffAccumulatorForRecord(record,
> splitBatchSize);
> // A newly created batch can always host the first message.
> if (!batch.tryAppendForSplit(record.timestamp(), record.key(),
> record.value(), record.headers(), thunk)) {
> batches.add(batch);
> batch = createBatchOffAccumulatorForRecord(record,
> splitBatchSize);
> batch.tryAppendForSplit(record.timestamp(), record.key(),
> record.value(), record.headers(), thunk);
> }
> {code}
> Refer to RecordAccumulator#tryAppend, we can call closeForRecordAppends()
> after a batch is full.
> {code:java}
> private RecordAppendResult tryAppend(long timestamp, byte[] key, byte[]
> value, Header[] headers,
> Callback callback,
> Deque<ProducerBatch> deque, long nowMs) {
> ProducerBatch last = deque.peekLast();
> if (last != null) {
> FutureRecordMetadata future = last.tryAppend(timestamp, key,
> value, headers, callback, nowMs);
> if (future == null)
> last.closeForRecordAppends();
> else
> return new RecordAppendResult(future, deque.size() > 1 ||
> last.isFull(), false, false);
> }
> return null;
> }
> {code}
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