jasonk000 commented on a change in pull request #11722:
URL: https://github.com/apache/kafka/pull/11722#discussion_r799030101
##########
File path:
clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java
##########
@@ -578,41 +587,45 @@ private boolean
shouldStopDrainBatchesForPartition(ProducerBatch first, TopicPar
} else {
if (shouldStopDrainBatchesForPartition(first, tp))
break;
+ }
- boolean isTransactional = transactionManager != null &&
transactionManager.isTransactional();
- ProducerIdAndEpoch producerIdAndEpoch =
- transactionManager != null ?
transactionManager.producerIdAndEpoch() : null;
- ProducerBatch batch = deque.pollFirst();
- if (producerIdAndEpoch != null && !batch.hasSequence()) {
- // If the producer id/epoch of the partition do not
match the latest one
- // of the producer, we update it and reset the
sequence. This should be
- // only done when all its in-flight batches have
completed. This is guarantee
- // in `shouldStopDrainBatchesForPartition`.
-
transactionManager.maybeUpdateProducerIdAndEpoch(batch.topicPartition);
-
- // If the batch already has an assigned sequence, then
we should not change the producer id and
- // sequence number, since this may introduce
duplicates. In particular, the previous attempt
- // may actually have been accepted, and if we change
the producer id and sequence here, this
- // attempt will also be accepted, causing a duplicate.
- //
- // Additionally, we update the next sequence number
bound for the partition, and also have
- // the transaction manager track the batch so as to
ensure that sequence ordering is maintained
- // even if we receive out of order responses.
- batch.setProducerState(producerIdAndEpoch,
transactionManager.sequenceNumber(batch.topicPartition), isTransactional);
-
transactionManager.incrementSequenceNumber(batch.topicPartition,
batch.recordCount);
- log.debug("Assigned producerId {} and producerEpoch {}
to batch with base sequence " +
- "{} being sent to partition {}",
producerIdAndEpoch.producerId,
- producerIdAndEpoch.epoch, batch.baseSequence(),
tp);
-
- transactionManager.addInFlightBatch(batch);
- }
- batch.close();
- size += batch.records().sizeInBytes();
- ready.add(batch);
+ // do the rest of the work by processing outside the lock
+ // close() is particularly expensive
+ batch = deque.pollFirst();
+ }
- batch.drained(now);
- }
+ boolean isTransactional = transactionManager != null &&
transactionManager.isTransactional();
+ ProducerIdAndEpoch producerIdAndEpoch =
+ transactionManager != null ?
transactionManager.producerIdAndEpoch() : null;
+ if (producerIdAndEpoch != null && !batch.hasSequence()) {
+ // If the producer id/epoch of the partition do not match the
latest one
+ // of the producer, we update it and reset the sequence. This
should be
+ // only done when all its in-flight batches have completed.
This is guarantee
+ // in `shouldStopDrainBatchesForPartition`.
+
transactionManager.maybeUpdateProducerIdAndEpoch(batch.topicPartition);
+
+ // If the batch already has an assigned sequence, then we
should not change the producer id and
+ // sequence number, since this may introduce duplicates. In
particular, the previous attempt
+ // may actually have been accepted, and if we change the
producer id and sequence here, this
+ // attempt will also be accepted, causing a duplicate.
+ //
+ // Additionally, we update the next sequence number bound for
the partition, and also have
+ // the transaction manager track the batch so as to ensure
that sequence ordering is maintained
+ // even if we receive out of order responses.
+ batch.setProducerState(producerIdAndEpoch,
transactionManager.sequenceNumber(batch.topicPartition), isTransactional);
+
transactionManager.incrementSequenceNumber(batch.topicPartition,
batch.recordCount);
Review comment:
OK, this makes sense. I agree it makes sense to push this back into the
synchronized block; the more important part for reducing lock duration is to
move the `close()` outside of the block. Would you agree with this approach?
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