chia7712 commented on code in PR #17099:
URL: https://github.com/apache/kafka/pull/17099#discussion_r1827065687
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clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java:
##########
@@ -1552,6 +1552,7 @@ private class AppendCallbacks implements
RecordAccumulator.AppendCallbacks {
private final String recordLogString;
private volatile int partition = RecordMetadata.UNKNOWN_PARTITION;
private volatile TopicPartition topicPartition;
+ private Headers headers;
Review Comment:
please add `final`
##########
clients/src/main/java/org/apache/kafka/clients/producer/internals/ProducerInterceptors.java:
##########
@@ -107,14 +110,21 @@ public void onAcknowledgement(RecordMetadata metadata,
Exception exception) {
public void onSendError(ProducerRecord<K, V> record, TopicPartition
interceptTopicPartition, Exception exception) {
for (ProducerInterceptor<K, V> interceptor : this.interceptors) {
try {
+ Headers headers = record != null ? record.headers() : null;
+ if (headers instanceof RecordHeaders) {
+ // make a copy of the headers to make sure it is read-only
+ RecordHeaders recordHeaders = (RecordHeaders) headers;
+ headers = new RecordHeaders(recordHeaders);
+ ((RecordHeaders) headers).setReadOnly();
+ }
if (record == null && interceptTopicPartition == null) {
- interceptor.onAcknowledgement(null, exception);
+ interceptor.onAcknowledgement(null, exception, headers);
Review Comment:
We must call `onAcknowledgement(RecordMetadata, Exception, Headers)` even if
headers is null. Otherwise, users who implement only the new method will miss
this event.
##########
clients/src/main/java/org/apache/kafka/clients/producer/internals/ProducerInterceptors.java:
##########
@@ -107,14 +110,21 @@ public void onAcknowledgement(RecordMetadata metadata,
Exception exception) {
public void onSendError(ProducerRecord<K, V> record, TopicPartition
interceptTopicPartition, Exception exception) {
for (ProducerInterceptor<K, V> interceptor : this.interceptors) {
try {
+ Headers headers = record != null ? record.headers() : null;
+ if (headers instanceof RecordHeaders) {
+ // make a copy of the headers to make sure it is read-only
Review Comment:
we don't need to copy it if it is read-only, right?
##########
clients/src/main/java/org/apache/kafka/clients/producer/ProducerInterceptor.java:
##########
@@ -86,7 +87,37 @@ public interface ProducerInterceptor<K, V> extends
Configurable, AutoCloseable {
* {@link
org.apache.kafka.clients.producer.KafkaProducer#send(ProducerRecord)}.
* @param exception The exception thrown during processing of this record.
Null if no error occurred.
*/
- void onAcknowledgement(RecordMetadata metadata, Exception exception);
+ default void onAcknowledgement(RecordMetadata metadata, Exception
exception) {};
+
+ /**
+ * This method is called when the record sent to the server has been
acknowledged, or when sending the record fails before
+ * it gets sent to the server.
+ * <p>
+ * This method is called just before the user callback is invoked, or in
cases when
+ * <code>KafkaProducer.send()</code> throws an exception.
+ * throws an exception.
+ * <p>
+ * Note that any exception thrown by this method will be ignored by the
caller.
+ * <p>
+ * The implementation of this method should be fast as it generally
executes in a background
+ * I/O thread. A slow implementation could delay the sending of messages
from other threads.
+
+ * Otherwise, sending of messages from other threads could be delayed.
+ *
+ * @param metadata The metadata for the record that was sent. It includes
the partition and offset of the record.
+ * If an error occurred, the metadata will contain only the
topic and possibly the partition.
+
+ * If the partition was not assigned yet due to an error,
+ * it will be set to {@link
org.apache.kafka.clients.producer.RecordMetadata#UNKNOWN_PARTITION}.
+ * before partition gets assigned, then partition will be
set to RecordMetadata.NO_PARTITION.
+ * The metadata may be null if the client passed null
record to
+ * {@link
org.apache.kafka.clients.producer.KafkaProducer#send(ProducerRecord)}.
+ * @param exception The exception thrown during the processing of this
record, or null if no error occurred.
+ * @param headers The headers for the record that was sent. This parameter
may be null.
+ */
+ default void onAcknowledgement(RecordMetadata metadata, Exception
exception, Headers headers) {
+ onAcknowledgement(metadata, exception);
+ };
Review Comment:
Please remove `;`
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