org.apache.kafka.clients.producer.KafkaProducer Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.clients.producer;
import org.apache.kafka.clients.ApiVersions;
import org.apache.kafka.clients.ClientDnsLookup;
import org.apache.kafka.clients.ClientUtils;
import org.apache.kafka.clients.KafkaClient;
import org.apache.kafka.clients.NetworkClient;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.OffsetAndMetadata;
import org.apache.kafka.clients.consumer.OffsetCommitCallback;
import org.apache.kafka.clients.producer.internals.BufferPool;
import org.apache.kafka.clients.producer.internals.ProducerInterceptors;
import org.apache.kafka.clients.producer.internals.ProducerMetadata;
import org.apache.kafka.clients.producer.internals.ProducerMetrics;
import org.apache.kafka.clients.producer.internals.RecordAccumulator;
import org.apache.kafka.clients.producer.internals.Sender;
import org.apache.kafka.clients.producer.internals.TransactionManager;
import org.apache.kafka.clients.producer.internals.TransactionalRequestResult;
import org.apache.kafka.common.Cluster;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.Metric;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.PartitionInfo;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.common.errors.ApiException;
import org.apache.kafka.common.errors.AuthenticationException;
import org.apache.kafka.common.errors.AuthorizationException;
import org.apache.kafka.common.errors.InterruptException;
import org.apache.kafka.common.errors.InvalidTopicException;
import org.apache.kafka.common.errors.ProducerFencedException;
import org.apache.kafka.common.errors.RecordTooLargeException;
import org.apache.kafka.common.errors.SerializationException;
import org.apache.kafka.common.errors.TimeoutException;
import org.apache.kafka.common.header.Header;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.header.internals.RecordHeaders;
import org.apache.kafka.common.internals.ClusterResourceListeners;
import org.apache.kafka.common.metrics.JmxReporter;
import org.apache.kafka.common.metrics.MetricConfig;
import org.apache.kafka.common.metrics.Metrics;
import org.apache.kafka.common.metrics.MetricsReporter;
import org.apache.kafka.common.metrics.Sensor;
import org.apache.kafka.common.network.ChannelBuilder;
import org.apache.kafka.common.network.Selector;
import org.apache.kafka.common.record.AbstractRecords;
import org.apache.kafka.common.record.CompressionType;
import org.apache.kafka.common.record.RecordBatch;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.common.utils.AppInfoParser;
import org.apache.kafka.common.utils.KafkaThread;
import org.apache.kafka.common.utils.LogContext;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.common.utils.Utils;
import org.apache.logging.log4j.Logger;
import java.net.InetSocketAddress;
import java.time.Duration;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
/**
* A Kafka client that publishes records to the Kafka cluster.
*
* The producer is thread safe and sharing a single producer instance across threads will generally be faster than
* having multiple instances.
*
* Here is a simple example of using the producer to send records with strings containing sequential numbers as the key/value
* pairs.
*
* {@code
* Properties props = new Properties();
* props.put("bootstrap.servers", "localhost:9092");
* props.put("acks", "all");
* props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
* props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
*
* Producer producer = new KafkaProducer<>(props);
* for (int i = 0; i < 100; i++)
* producer.send(new ProducerRecord("my-topic", Integer.toString(i), Integer.toString(i)));
*
* producer.close();
* }
*
* The producer consists of a pool of buffer space that holds records that haven't yet been transmitted to the server
* as well as a background I/O thread that is responsible for turning these records into requests and transmitting them
* to the cluster. Failure to close the producer after use will leak these resources.
*
* The {@link #send(ProducerRecord) send()} method is asynchronous. When called it adds the record to a buffer of pending record sends
* and immediately returns. This allows the producer to batch together individual records for efficiency.
*
* The acks config controls the criteria under which requests are considered complete. The "all" setting
* we have specified will result in blocking on the full commit of the record, the slowest but most durable setting.
*
* If the request fails, the producer can automatically retry, though since we have specified retries
* as 0 it won't. Enabling retries also opens up the possibility of duplicates (see the documentation on
* message delivery semantics for details).
*
* The producer maintains buffers of unsent records for each partition. These buffers are of a size specified by
* the batch.size config. Making this larger can result in more batching, but requires more memory (since we will
* generally have one of these buffers for each active partition).
*
* By default a buffer is available to send immediately even if there is additional unused space in the buffer. However if you
* want to reduce the number of requests you can set linger.ms to something greater than 0. This will
* instruct the producer to wait up to that number of milliseconds before sending a request in hope that more records will
* arrive to fill up the same batch. This is analogous to Nagle's algorithm in TCP. For example, in the code snippet above,
* likely all 100 records would be sent in a single request since we set our linger time to 1 millisecond. However this setting
* would add 1 millisecond of latency to our request waiting for more records to arrive if we didn't fill up the buffer. Note that
* records that arrive close together in time will generally batch together even with linger.ms=0 so under heavy load
* batching will occur regardless of the linger configuration; however setting this to something larger than 0 can lead to fewer, more
* efficient requests when not under maximal load at the cost of a small amount of latency.
*
* The buffer.memory controls the total amount of memory available to the producer for buffering. If records
* are sent faster than they can be transmitted to the server then this buffer space will be exhausted. When the buffer space is
* exhausted additional send calls will block. The threshold for time to block is determined by max.block.ms after which it throws
* a TimeoutException.
*
* The key.serializer and value.serializer instruct how to turn the key and value objects the user provides with
* their ProducerRecord into bytes. You can use the included {@link org.apache.kafka.common.serialization.ByteArraySerializer} or
* {@link org.apache.kafka.common.serialization.StringSerializer} for simple string or byte types.
*
* From Kafka 0.11, the KafkaProducer supports two additional modes: the idempotent producer and the transactional producer.
* The idempotent producer strengthens Kafka's delivery semantics from at least once to exactly once delivery. In particular
* producer retries will no longer introduce duplicates. The transactional producer allows an application to send messages
* to multiple partitions (and topics!) atomically.
*
*
* To enable idempotence, the enable.idempotence configuration must be set to true. If set, the
* retries config will default to Integer.MAX_VALUE and the acks config will
* default to all. There are no API changes for the idempotent producer, so existing applications will
* not need to be modified to take advantage of this feature.
*
*
* To take advantage of the idempotent producer, it is imperative to avoid application level re-sends since these cannot
* be de-duplicated. As such, if an application enables idempotence, it is recommended to leave the retries
* config unset, as it will be defaulted to Integer.MAX_VALUE. Additionally, if a {@link #send(ProducerRecord)}
* returns an error even with infinite retries (for instance if the message expires in the buffer before being sent),
* then it is recommended to shut down the producer and check the contents of the last produced message to ensure that
* it is not duplicated. Finally, the producer can only guarantee idempotence for messages sent within a single session.
*
* To use the transactional producer and the attendant APIs, you must set the transactional.id
* configuration property. If the transactional.id is set, idempotence is automatically enabled along with
* the producer configs which idempotence depends on. Further, topics which are included in transactions should be configured
* for durability. In particular, the replication.factor should be at least 3, and the
* min.insync.replicas for these topics should be set to 2. Finally, in order for transactional guarantees
* to be realized from end-to-end, the consumers must be configured to read only committed messages as well.
*
*
* The purpose of the transactional.id is to enable transaction recovery across multiple sessions of a
* single producer instance. It would typically be derived from the shard identifier in a partitioned, stateful, application.
* As such, it should be unique to each producer instance running within a partitioned application.
*
* All the new transactional APIs are blocking and will throw exceptions on failure. The example
* below illustrates how the new APIs are meant to be used. It is similar to the example above, except that all
* 100 messages are part of a single transaction.
*
*
*
* {@code
* Properties props = new Properties();
* props.put("bootstrap.servers", "localhost:9092");
* props.put("transactional.id", "my-transactional-id");
* Producer producer = new KafkaProducer<>(props, new StringSerializer(), new StringSerializer());
*
* producer.initTransactions();
*
* try {
* producer.beginTransaction();
* for (int i = 0; i < 100; i++)
* producer.send(new ProducerRecord<>("my-topic", Integer.toString(i), Integer.toString(i)));
* producer.commitTransaction();
* } catch (ProducerFencedException | OutOfOrderSequenceException | AuthorizationException e) {
* // We can't recover from these exceptions, so our only option is to close the producer and exit.
* producer.close();
* } catch (KafkaException e) {
* // For all other exceptions, just abort the transaction and try again.
* producer.abortTransaction();
* }
* producer.close();
* }
*
*
* As is hinted at in the example, there can be only one open transaction per producer. All messages sent between the
* {@link #beginTransaction()} and {@link #commitTransaction()} calls will be part of a single transaction. When the
* transactional.id is specified, all messages sent by the producer must be part of a transaction.
*
*
* The transactional producer uses exceptions to communicate error states. In particular, it is not required
* to specify callbacks for producer.send() or to call .get() on the returned Future: a
* KafkaException would be thrown if any of the
* producer.send() or transactional calls hit an irrecoverable error during a transaction. See the {@link #send(ProducerRecord)}
* documentation for more details about detecting errors from a transactional send.
*
* By calling
* producer.abortTransaction() upon receiving a KafkaException we can ensure that any
* successful writes are marked as aborted, hence keeping the transactional guarantees.
*
*
* This client can communicate with brokers that are version 0.10.0 or newer. Older or newer brokers may not support
* certain client features. For instance, the transactional APIs need broker versions 0.11.0 or later. You will receive an
* UnsupportedVersionException when invoking an API that is not available in the running broker version.
*
*/
@SuppressWarnings({"unchecked","rawtypes" })
public class KafkaProducer implements Producer {
private final Logger log;
private static final AtomicInteger PRODUCER_CLIENT_ID_SEQUENCE = new AtomicInteger(1);
private static final String JMX_PREFIX = "kafka.producer";
public static final String NETWORK_THREAD_PREFIX = "kafka-producer-network-thread";
public static final String PRODUCER_METRIC_GROUP_NAME = "producer-metrics";
private final String clientId;
// Visible for testing
final Metrics metrics;
private final Partitioner partitioner;
private final int maxRequestSize;
private final long totalMemorySize;
private final ProducerMetadata metadata;
private final RecordAccumulator accumulator;
private final Sender sender;
private final Thread ioThread;
private final CompressionType compressionType;
private final Sensor errors;
private final Time time;
private final Serializer keySerializer;
private final Serializer valueSerializer;
private final ProducerConfig producerConfig;
private final long maxBlockTimeMs;
private final ProducerInterceptors interceptors;
private final ApiVersions apiVersions;
private final TransactionManager transactionManager;
/**
* A producer is instantiated by providing a set of key-value pairs as configuration. Valid configuration strings
* are documented here. Values can be
* either strings or Objects of the appropriate type (for example a numeric configuration would accept either the
* string "42" or the integer 42).
*
* Note: after creating a {@code KafkaProducer} you must always {@link #close()} it to avoid resource leaks.
* @param configs The producer configs
*
*/
public KafkaProducer(final Map configs) {
this(configs, null, null, null, null, null, Time.SYSTEM);
}
/**
* A producer is instantiated by providing a set of key-value pairs as configuration, a key and a value {@link Serializer}.
* Valid configuration strings are documented here.
* Values can be either strings or Objects of the appropriate type (for example a numeric configuration would accept
* either the string "42" or the integer 42).
*
* Note: after creating a {@code KafkaProducer} you must always {@link #close()} it to avoid resource leaks.
* @param configs The producer configs
* @param keySerializer The serializer for key that implements {@link Serializer}. The configure() method won't be
* called in the producer when the serializer is passed in directly.
* @param valueSerializer The serializer for value that implements {@link Serializer}. The configure() method won't
* be called in the producer when the serializer is passed in directly.
*/
public KafkaProducer(Map configs, Serializer keySerializer, Serializer valueSerializer) {
this(configs, keySerializer, valueSerializer, null, null, null, Time.SYSTEM);
}
/**
* A producer is instantiated by providing a set of key-value pairs as configuration. Valid configuration strings
* are documented here.
*
* Note: after creating a {@code KafkaProducer} you must always {@link #close()} it to avoid resource leaks.
* @param properties The producer configs
*/
public KafkaProducer(Properties properties) {
this(propsToMap(properties), null, null, null, null, null, Time.SYSTEM);
}
/**
* A producer is instantiated by providing a set of key-value pairs as configuration, a key and a value {@link Serializer}.
* Valid configuration strings are documented here.
*
* Note: after creating a {@code KafkaProducer} you must always {@link #close()} it to avoid resource leaks.
* @param properties The producer configs
* @param keySerializer The serializer for key that implements {@link Serializer}. The configure() method won't be
* called in the producer when the serializer is passed in directly.
* @param valueSerializer The serializer for value that implements {@link Serializer}. The configure() method won't
* be called in the producer when the serializer is passed in directly.
*/
public KafkaProducer(Properties properties, Serializer keySerializer, Serializer valueSerializer) {
this(propsToMap(properties), keySerializer, valueSerializer, null, null, null,
Time.SYSTEM);
}
// visible for testing
KafkaProducer(Map configs,
Serializer keySerializer,
Serializer valueSerializer,
ProducerMetadata metadata,
KafkaClient kafkaClient,
ProducerInterceptors interceptors,
Time time) {
ProducerConfig config = new ProducerConfig(ProducerConfig.addSerializerToConfig(configs, keySerializer,
valueSerializer));
try {
Map userProvidedConfigs = config.originals();
this.producerConfig = config;
this.time = time;
String transactionalId = userProvidedConfigs.containsKey(ProducerConfig.TRANSACTIONAL_ID_CONFIG) ?
(String) userProvidedConfigs.get(ProducerConfig.TRANSACTIONAL_ID_CONFIG) : null;
this.clientId = buildClientId(config.getString(ProducerConfig.CLIENT_ID_CONFIG), transactionalId);
LogContext logContext;
if (transactionalId == null)
logContext = new LogContext(String.format("[Producer clientId=%s] ", clientId));
else
logContext = new LogContext(String.format("[Producer clientId=%s, transactionalId=%s] ", clientId, transactionalId));
log = logContext.logger(KafkaProducer.class);
log.trace("Starting the Kafka producer");
Map metricTags = Collections.singletonMap("client-id", clientId);
MetricConfig metricConfig = new MetricConfig().samples(config.getInt(ProducerConfig.METRICS_NUM_SAMPLES_CONFIG))
.timeWindow(config.getLong(ProducerConfig.METRICS_SAMPLE_WINDOW_MS_CONFIG), TimeUnit.MILLISECONDS)
.recordLevel(Sensor.RecordingLevel.forName(config.getString(ProducerConfig.METRICS_RECORDING_LEVEL_CONFIG)))
.tags(metricTags);
List reporters = config.getConfiguredInstances(ProducerConfig.METRIC_REPORTER_CLASSES_CONFIG,
MetricsReporter.class,
Collections.singletonMap(ProducerConfig.CLIENT_ID_CONFIG, clientId));
reporters.add(new JmxReporter(JMX_PREFIX));
this.metrics = new Metrics(metricConfig, reporters, time);
this.partitioner = config.getConfiguredInstance(ProducerConfig.PARTITIONER_CLASS_CONFIG, Partitioner.class);
long retryBackoffMs = config.getLong(ProducerConfig.RETRY_BACKOFF_MS_CONFIG);
if (keySerializer == null) {
this.keySerializer = config.getConfiguredInstance(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,
Serializer.class);
this.keySerializer.configure(config.originals(), true);
} else {
config.ignore(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG);
this.keySerializer = keySerializer;
}
if (valueSerializer == null) {
this.valueSerializer = config.getConfiguredInstance(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,
Serializer.class);
this.valueSerializer.configure(config.originals(), false);
} else {
config.ignore(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG);
this.valueSerializer = valueSerializer;
}
// load interceptors and make sure they get clientId
userProvidedConfigs.put(ProducerConfig.CLIENT_ID_CONFIG, clientId);
ProducerConfig configWithClientId = new ProducerConfig(userProvidedConfigs, false);
List> interceptorList = (List) configWithClientId.getConfiguredInstances(
ProducerConfig.INTERCEPTOR_CLASSES_CONFIG, ProducerInterceptor.class);
if (interceptors != null)
this.interceptors = interceptors;
else
this.interceptors = new ProducerInterceptors<>(interceptorList);
ClusterResourceListeners clusterResourceListeners = configureClusterResourceListeners(keySerializer,
valueSerializer, interceptorList, reporters);
this.maxRequestSize = config.getInt(ProducerConfig.MAX_REQUEST_SIZE_CONFIG);
this.totalMemorySize = config.getLong(ProducerConfig.BUFFER_MEMORY_CONFIG);
this.compressionType = CompressionType.forName(config.getString(ProducerConfig.COMPRESSION_TYPE_CONFIG));
this.maxBlockTimeMs = config.getLong(ProducerConfig.MAX_BLOCK_MS_CONFIG);
this.transactionManager = configureTransactionState(config, logContext, log);
int deliveryTimeoutMs = configureDeliveryTimeout(config, log);
this.apiVersions = new ApiVersions();
this.accumulator = new RecordAccumulator(logContext,
config.getInt(ProducerConfig.BATCH_SIZE_CONFIG),
this.compressionType,
lingerMs(config),
retryBackoffMs,
deliveryTimeoutMs,
metrics,
PRODUCER_METRIC_GROUP_NAME,
time,
apiVersions,
transactionManager,
new BufferPool(this.totalMemorySize, config.getInt(ProducerConfig.BATCH_SIZE_CONFIG), metrics, time, PRODUCER_METRIC_GROUP_NAME));
List addresses = ClientUtils.parseAndValidateAddresses(
config.getList(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG),
config.getString(ProducerConfig.CLIENT_DNS_LOOKUP_CONFIG));
if (metadata != null) {
this.metadata = metadata;
} else {
this.metadata = new ProducerMetadata(retryBackoffMs,
config.getLong(ProducerConfig.METADATA_MAX_AGE_CONFIG),
logContext,
clusterResourceListeners,
Time.SYSTEM);
this.metadata.bootstrap(addresses, time.milliseconds());
}
this.errors = this.metrics.sensor("errors");
this.sender = newSender(logContext, kafkaClient, this.metadata);
String ioThreadName = NETWORK_THREAD_PREFIX + " | " + clientId;
this.ioThread = new KafkaThread(ioThreadName, this.sender, true);
this.ioThread.start();
config.logUnused();
AppInfoParser.registerAppInfo(JMX_PREFIX, clientId, metrics, time.milliseconds());
log.debug("Kafka producer started");
} catch (Throwable t) {
// call close methods if internal objects are already constructed this is to prevent resource leak. see KAFKA-2121
close(Duration.ofMillis(0), true);
// now propagate the exception
throw new KafkaException("Failed to construct kafka producer", t);
}
}
private static String buildClientId(String configuredClientId, String transactionalId) {
if (!configuredClientId.isEmpty())
return configuredClientId;
if (transactionalId != null)
return "producer-" + transactionalId;
return "producer-" + PRODUCER_CLIENT_ID_SEQUENCE.getAndIncrement();
}
// visible for testing
Sender newSender(LogContext logContext, KafkaClient kafkaClient, ProducerMetadata metadata) {
int maxInflightRequests = configureInflightRequests(producerConfig, transactionManager != null);
int requestTimeoutMs = producerConfig.getInt(ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG);
ChannelBuilder channelBuilder = ClientUtils.createChannelBuilder(producerConfig, time);
ProducerMetrics metricsRegistry = new ProducerMetrics(this.metrics);
Sensor throttleTimeSensor = Sender.throttleTimeSensor(metricsRegistry.senderMetrics);
KafkaClient client = kafkaClient != null ? kafkaClient : new NetworkClient(
new Selector(producerConfig.getLong(ProducerConfig.CONNECTIONS_MAX_IDLE_MS_CONFIG),
this.metrics, time, "producer", channelBuilder, logContext),
metadata,
clientId,
maxInflightRequests,
producerConfig.getLong(ProducerConfig.RECONNECT_BACKOFF_MS_CONFIG),
producerConfig.getLong(ProducerConfig.RECONNECT_BACKOFF_MAX_MS_CONFIG),
producerConfig.getInt(ProducerConfig.SEND_BUFFER_CONFIG),
producerConfig.getInt(ProducerConfig.RECEIVE_BUFFER_CONFIG),
requestTimeoutMs,
ClientDnsLookup.forConfig(producerConfig.getString(ProducerConfig.CLIENT_DNS_LOOKUP_CONFIG)),
time,
true,
apiVersions,
throttleTimeSensor,
logContext);
int retries = configureRetries(producerConfig, transactionManager != null, log);
short acks = configureAcks(producerConfig, transactionManager != null, log);
return new Sender(logContext,
client,
metadata,
this.accumulator,
maxInflightRequests == 1,
producerConfig.getInt(ProducerConfig.MAX_REQUEST_SIZE_CONFIG),
acks,
retries,
metricsRegistry.senderMetrics,
time,
requestTimeoutMs,
producerConfig.getLong(ProducerConfig.RETRY_BACKOFF_MS_CONFIG),
this.transactionManager,
apiVersions);
}
private static int lingerMs(ProducerConfig config) {
return (int) Math.min(config.getLong(ProducerConfig.LINGER_MS_CONFIG), Integer.MAX_VALUE);
}
private static int configureDeliveryTimeout(ProducerConfig config, Logger log) {
int deliveryTimeoutMs = config.getInt(ProducerConfig.DELIVERY_TIMEOUT_MS_CONFIG);
int lingerMs = lingerMs(config);
int requestTimeoutMs = config.getInt(ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG);
int lingerAndRequestTimeoutMs = (int) Math.min((long) lingerMs + requestTimeoutMs, Integer.MAX_VALUE);
if (deliveryTimeoutMs < Integer.MAX_VALUE && deliveryTimeoutMs < lingerAndRequestTimeoutMs) {
if (config.originals().containsKey(ProducerConfig.DELIVERY_TIMEOUT_MS_CONFIG)) {
// throw an exception if the user explicitly set an inconsistent value
throw new ConfigException(ProducerConfig.DELIVERY_TIMEOUT_MS_CONFIG
+ " should be equal to or larger than " + ProducerConfig.LINGER_MS_CONFIG
+ " + " + ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG);
} else {
// override deliveryTimeoutMs default value to lingerMs + requestTimeoutMs for backward compatibility
deliveryTimeoutMs = lingerAndRequestTimeoutMs;
log.warn("{} should be equal to or larger than {} + {}. Setting it to {}.",
ProducerConfig.DELIVERY_TIMEOUT_MS_CONFIG, ProducerConfig.LINGER_MS_CONFIG,
ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG, deliveryTimeoutMs);
}
}
return deliveryTimeoutMs;
}
private static TransactionManager configureTransactionState(ProducerConfig config, LogContext logContext, Logger log) {
TransactionManager transactionManager = null;
boolean userConfiguredIdempotence = false;
if (config.originals().containsKey(ProducerConfig.ENABLE_IDEMPOTENCE_CONFIG))
userConfiguredIdempotence = true;
boolean userConfiguredTransactions = false;
if (config.originals().containsKey(ProducerConfig.TRANSACTIONAL_ID_CONFIG))
userConfiguredTransactions = true;
boolean idempotenceEnabled = config.getBoolean(ProducerConfig.ENABLE_IDEMPOTENCE_CONFIG);
if (!idempotenceEnabled && userConfiguredIdempotence && userConfiguredTransactions)
throw new ConfigException("Cannot set a " + ProducerConfig.TRANSACTIONAL_ID_CONFIG + " without also enabling idempotence.");
if (userConfiguredTransactions)
idempotenceEnabled = true;
if (idempotenceEnabled) {
String transactionalId = config.getString(ProducerConfig.TRANSACTIONAL_ID_CONFIG);
int transactionTimeoutMs = config.getInt(ProducerConfig.TRANSACTION_TIMEOUT_CONFIG);
long retryBackoffMs = config.getLong(ProducerConfig.RETRY_BACKOFF_MS_CONFIG);
transactionManager = new TransactionManager(logContext, transactionalId, transactionTimeoutMs, retryBackoffMs);
if (transactionManager.isTransactional())
log.info("Instantiated a transactional producer.");
else
log.info("Instantiated an idempotent producer.");
}
return transactionManager;
}
private static int configureRetries(ProducerConfig config, boolean idempotenceEnabled, Logger log) {
boolean userConfiguredRetries = false;
if (config.originals().containsKey(ProducerConfig.RETRIES_CONFIG)) {
userConfiguredRetries = true;
}
if (idempotenceEnabled && !userConfiguredRetries) {
// We recommend setting infinite retries when the idempotent producer is enabled, so it makes sense to make
// this the default.
log.info("Overriding the default retries config to the recommended value of {} since the idempotent " +
"producer is enabled.", Integer.MAX_VALUE);
return Integer.MAX_VALUE;
}
if (idempotenceEnabled && config.getInt(ProducerConfig.RETRIES_CONFIG) == 0) {
throw new ConfigException("Must set " + ProducerConfig.RETRIES_CONFIG + " to non-zero when using the idempotent producer.");
}
return config.getInt(ProducerConfig.RETRIES_CONFIG);
}
private static int configureInflightRequests(ProducerConfig config, boolean idempotenceEnabled) {
if (idempotenceEnabled && 5 < config.getInt(ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION)) {
throw new ConfigException("Must set " + ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION + " to at most 5" +
" to use the idempotent producer.");
}
return config.getInt(ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION);
}
private static short configureAcks(ProducerConfig config, boolean idempotenceEnabled, Logger log) {
boolean userConfiguredAcks = false;
short acks = (short) parseAcks(config.getString(ProducerConfig.ACKS_CONFIG));
if (config.originals().containsKey(ProducerConfig.ACKS_CONFIG)) {
userConfiguredAcks = true;
}
if (idempotenceEnabled && !userConfiguredAcks) {
log.info("Overriding the default {} to all since idempotence is enabled.", ProducerConfig.ACKS_CONFIG);
return -1;
}
if (idempotenceEnabled && acks != -1) {
throw new ConfigException("Must set " + ProducerConfig.ACKS_CONFIG + " to all in order to use the idempotent " +
"producer. Otherwise we cannot guarantee idempotence.");
}
return acks;
}
private static int parseAcks(String acksString) {
try {
return acksString.trim().equalsIgnoreCase("all") ? -1 : Integer.parseInt(acksString.trim());
} catch (NumberFormatException e) {
throw new ConfigException("Invalid configuration value for 'acks': " + acksString);
}
}
/**
* Needs to be called before any other methods when the transactional.id is set in the configuration.
*
* This method does the following:
* 1. Ensures any transactions initiated by previous instances of the producer with the same
* transactional.id are completed. If the previous instance had failed with a transaction in
* progress, it will be aborted. If the last transaction had begun completion,
* but not yet finished, this method awaits its completion.
* 2. Gets the internal producer id and epoch, used in all future transactional
* messages issued by the producer.
*
* Note that this method will raise {@link TimeoutException} if the transactional state cannot
* be initialized before expiration of {@code max.block.ms}. Additionally, it will raise {@link InterruptException}
* if interrupted. It is safe to retry in either case, but once the transactional state has been successfully
* initialized, this method should no longer be used.
*
* @throws IllegalStateException if no transactional.id has been configured
* @throws org.apache.kafka.common.errors.UnsupportedVersionException fatal error indicating the broker
* does not support transactions (i.e. if its version is lower than 0.11.0.0)
* @throws org.apache.kafka.common.errors.AuthorizationException fatal error indicating that the configured
* transactional.id is not authorized. See the exception for more details
* @throws KafkaException if the producer has encountered a previous fatal error or for any other unexpected error
* @throws TimeoutException if the time taken for initialize the transaction has surpassed max.block.ms.
* @throws InterruptException if the thread is interrupted while blocked
*/
public void initTransactions() {
throwIfNoTransactionManager();
throwIfProducerClosed();
TransactionalRequestResult result = transactionManager.initializeTransactions();
sender.wakeup();
result.await(maxBlockTimeMs, TimeUnit.MILLISECONDS);
}
/**
* Should be called before the start of each new transaction. Note that prior to the first invocation
* of this method, you must invoke {@link #initTransactions()} exactly one time.
*
* @throws IllegalStateException if no transactional.id has been configured or if {@link #initTransactions()}
* has not yet been invoked
* @throws ProducerFencedException if another producer with the same transactional.id is active
* @throws org.apache.kafka.common.errors.UnsupportedVersionException fatal error indicating the broker
* does not support transactions (i.e. if its version is lower than 0.11.0.0)
* @throws org.apache.kafka.common.errors.AuthorizationException fatal error indicating that the configured
* transactional.id is not authorized. See the exception for more details
* @throws KafkaException if the producer has encountered a previous fatal error or for any other unexpected error
*/
public void beginTransaction() throws ProducerFencedException {
throwIfNoTransactionManager();
throwIfProducerClosed();
transactionManager.beginTransaction();
}
/**
* Sends a list of specified offsets to the consumer group coordinator, and also marks
* those offsets as part of the current transaction. These offsets will be considered
* committed only if the transaction is committed successfully. The committed offset should
* be the next message your application will consume, i.e. lastProcessedMessageOffset + 1.
*
* This method should be used when you need to batch consumed and produced messages
* together, typically in a consume-transform-produce pattern. Thus, the specified
* {@code consumerGroupId} should be the same as config parameter {@code group.id} of the used
* {@link KafkaConsumer consumer}. Note, that the consumer should have {@code enable.auto.commit=false}
* and should also not commit offsets manually (via {@link KafkaConsumer#commitSync(Map) sync} or
* {@link KafkaConsumer#commitAsync(Map, OffsetCommitCallback) async} commits).
*
* @throws IllegalStateException if no transactional.id has been configured or no transaction has been started
* @throws ProducerFencedException fatal error indicating another producer with the same transactional.id is active
* @throws org.apache.kafka.common.errors.UnsupportedVersionException fatal error indicating the broker
* does not support transactions (i.e. if its version is lower than 0.11.0.0)
* @throws org.apache.kafka.common.errors.UnsupportedForMessageFormatException fatal error indicating the message
* format used for the offsets topic on the broker does not support transactions
* @throws org.apache.kafka.common.errors.AuthorizationException fatal error indicating that the configured
* transactional.id is not authorized. See the exception for more details
* @throws KafkaException if the producer has encountered a previous fatal or abortable error, or for any
* other unexpected error
*/
public void sendOffsetsToTransaction(Map offsets,
String consumerGroupId) throws ProducerFencedException {
throwIfNoTransactionManager();
throwIfProducerClosed();
TransactionalRequestResult result = transactionManager.sendOffsetsToTransaction(offsets, consumerGroupId);
sender.wakeup();
result.await();
}
/**
* Commits the ongoing transaction. This method will flush any unsent records before actually committing the transaction.
*
* Further, if any of the {@link #send(ProducerRecord)} calls which were part of the transaction hit irrecoverable
* errors, this method will throw the last received exception immediately and the transaction will not be committed.
* So all {@link #send(ProducerRecord)} calls in a transaction must succeed in order for this method to succeed.
*
* Note that this method will raise {@link TimeoutException} if the transaction cannot be committed before expiration
* of {@code max.block.ms}. Additionally, it will raise {@link InterruptException} if interrupted.
* It is safe to retry in either case, but it is not possible to attempt a different operation (such as abortTransaction)
* since the commit may already be in the progress of completing. If not retrying, the only option is to close the producer.
*
* @throws IllegalStateException if no transactional.id has been configured or no transaction has been started
* @throws ProducerFencedException fatal error indicating another producer with the same transactional.id is active
* @throws org.apache.kafka.common.errors.UnsupportedVersionException fatal error indicating the broker
* does not support transactions (i.e. if its version is lower than 0.11.0.0)
* @throws org.apache.kafka.common.errors.AuthorizationException fatal error indicating that the configured
* transactional.id is not authorized. See the exception for more details
* @throws KafkaException if the producer has encountered a previous fatal or abortable error, or for any
* other unexpected error
* @throws TimeoutException if the time taken for committing the transaction has surpassed max.block.ms.
* @throws InterruptException if the thread is interrupted while blocked
*/
public void commitTransaction() throws ProducerFencedException {
throwIfNoTransactionManager();
throwIfProducerClosed();
TransactionalRequestResult result = transactionManager.beginCommit();
sender.wakeup();
result.await(maxBlockTimeMs, TimeUnit.MILLISECONDS);
}
/**
* Aborts the ongoing transaction. Any unflushed produce messages will be aborted when this call is made.
* This call will throw an exception immediately if any prior {@link #send(ProducerRecord)} calls failed with a
* {@link ProducerFencedException} or an instance of {@link org.apache.kafka.common.errors.AuthorizationException}.
*
* Note that this method will raise {@link TimeoutException} if the transaction cannot be aborted before expiration
* of {@code max.block.ms}. Additionally, it will raise {@link InterruptException} if interrupted.
* It is safe to retry in either case, but it is not possible to attempt a different operation (such as commitTransaction)
* since the abort may already be in the progress of completing. If not retrying, the only option is to close the producer.
*
* @throws IllegalStateException if no transactional.id has been configured or no transaction has been started
* @throws ProducerFencedException fatal error indicating another producer with the same transactional.id is active
* @throws org.apache.kafka.common.errors.UnsupportedVersionException fatal error indicating the broker
* does not support transactions (i.e. if its version is lower than 0.11.0.0)
* @throws org.apache.kafka.common.errors.AuthorizationException fatal error indicating that the configured
* transactional.id is not authorized. See the exception for more details
* @throws KafkaException if the producer has encountered a previous fatal error or for any other unexpected error
* @throws TimeoutException if the time taken for aborting the transaction has surpassed max.block.ms.
* @throws InterruptException if the thread is interrupted while blocked
*/
public void abortTransaction() throws ProducerFencedException {
throwIfNoTransactionManager();
throwIfProducerClosed();
TransactionalRequestResult result = transactionManager.beginAbort();
sender.wakeup();
result.await(maxBlockTimeMs, TimeUnit.MILLISECONDS);
}
/**
* Asynchronously send a record to a topic. Equivalent to send(record, null).
* See {@link #send(ProducerRecord, Callback)} for details.
*/
@Override
public Future send(ProducerRecord record) {
return send(record, null);
}
/**
* Asynchronously send a record to a topic and invoke the provided callback when the send has been acknowledged.
*
* The send is asynchronous and this method will return immediately once the record has been stored in the buffer of
* records waiting to be sent. This allows sending many records in parallel without blocking to wait for the
* response after each one.
*
* The result of the send is a {@link RecordMetadata} specifying the partition the record was sent to, the offset
* it was assigned and the timestamp of the record. If
* {@link org.apache.kafka.common.record.TimestampType#CREATE_TIME CreateTime} is used by the topic, the timestamp
* will be the user provided timestamp or the record send time if the user did not specify a timestamp for the
* record. If {@link org.apache.kafka.common.record.TimestampType#LOG_APPEND_TIME LogAppendTime} is used for the
* topic, the timestamp will be the Kafka broker local time when the message is appended.
*
* Since the send call is asynchronous it returns a {@link java.util.concurrent.Future Future} for the
* {@link RecordMetadata} that will be assigned to this record. Invoking {@link java.util.concurrent.Future#get()
* get()} on this future will block until the associated request completes and then return the metadata for the record
* or throw any exception that occurred while sending the record.
*
* If you want to simulate a simple blocking call you can call the get() method immediately:
*
*
* {@code
* byte[] key = "key".getBytes();
* byte[] value = "value".getBytes();
* ProducerRecord record = new ProducerRecord("my-topic", key, value)
* producer.send(record).get();
* }
*
* Fully non-blocking usage can make use of the {@link Callback} parameter to provide a callback that
* will be invoked when the request is complete.
*
*
* {@code
* ProducerRecord record = new ProducerRecord("the-topic", key, value);
* producer.send(myRecord,
* new Callback() {
* public void onCompletion(RecordMetadata metadata, Exception e) {
* if(e != null) {
* e.printStackTrace();
* } else {
* System.out.println("The offset of the record we just sent is: " + metadata.offset());
* }
* }
* });
* }
*
*
* Callbacks for records being sent to the same partition are guaranteed to execute in order. That is, in the
* following example callback1 is guaranteed to execute before callback2:
*
*
* {@code
* producer.send(new ProducerRecord(topic, partition, key1, value1), callback1);
* producer.send(new ProducerRecord(topic, partition, key2, value2), callback2);
* }
*
*
* When used as part of a transaction, it is not necessary to define a callback or check the result of the future
* in order to detect errors from send. If any of the send calls failed with an irrecoverable error,
* the final {@link #commitTransaction()} call will fail and throw the exception from the last failed send. When
* this happens, your application should call {@link #abortTransaction()} to reset the state and continue to send
* data.
*
*
* Some transactional send errors cannot be resolved with a call to {@link #abortTransaction()}. In particular,
* if a transactional send finishes with a {@link ProducerFencedException}, a {@link org.apache.kafka.common.errors.OutOfOrderSequenceException},
* a {@link org.apache.kafka.common.errors.UnsupportedVersionException}, or an
* {@link org.apache.kafka.common.errors.AuthorizationException}, then the only option left is to call {@link #close()}.
* Fatal errors cause the producer to enter a defunct state in which future API calls will continue to raise
* the same underyling error wrapped in a new {@link KafkaException}.
*
*
* It is a similar picture when idempotence is enabled, but no transactional.id has been configured.
* In this case, {@link org.apache.kafka.common.errors.UnsupportedVersionException} and
* {@link org.apache.kafka.common.errors.AuthorizationException} are considered fatal errors. However,
* {@link ProducerFencedException} does not need to be handled. Additionally, it is possible to continue
* sending after receiving an {@link org.apache.kafka.common.errors.OutOfOrderSequenceException}, but doing so
* can result in out of order delivery of pending messages. To ensure proper ordering, you should close the
* producer and create a new instance.
*
*
* If the message format of the destination topic is not upgraded to 0.11.0.0, idempotent and transactional
* produce requests will fail with an {@link org.apache.kafka.common.errors.UnsupportedForMessageFormatException}
* error. If this is encountered during a transaction, it is possible to abort and continue. But note that future
* sends to the same topic will continue receiving the same exception until the topic is upgraded.
*
*
* Note that callbacks will generally execute in the I/O thread of the producer and so should be reasonably fast or
* they will delay the sending of messages from other threads. If you want to execute blocking or computationally
* expensive callbacks it is recommended to use your own {@link java.util.concurrent.Executor} in the callback body
* to parallelize processing.
*
* @param record The record to send
* @param callback A user-supplied callback to execute when the record has been acknowledged by the server (null
* indicates no callback)
*
* @throws AuthenticationException if authentication fails. See the exception for more details
* @throws AuthorizationException fatal error indicating that the producer is not allowed to write
* @throws IllegalStateException if a transactional.id has been configured and no transaction has been started, or
* when send is invoked after producer has been closed.
* @throws InterruptException If the thread is interrupted while blocked
* @throws SerializationException If the key or value are not valid objects given the configured serializers
* @throws TimeoutException If the time taken for fetching metadata or allocating memory for the record has surpassed max.block.ms.
* @throws KafkaException If a Kafka related error occurs that does not belong to the public API exceptions.
*/
@Override
public Future send(ProducerRecord record, Callback callback) {
// intercept the record, which can be potentially modified; this method does not throw exceptions
ProducerRecord interceptedRecord = this.interceptors.onSend(record);
return doSend(interceptedRecord, callback);
}
// Verify that this producer instance has not been closed. This method throws IllegalStateException if the producer
// has already been closed.
private void throwIfProducerClosed() {
if (sender == null || !sender.isRunning())
throw new IllegalStateException("Cannot perform operation after producer has been closed");
}
/**
* Implementation of asynchronously send a record to a topic.
*/
private Future doSend(ProducerRecord record, Callback callback) {
TopicPartition tp = null;
try {
throwIfProducerClosed();
// first make sure the metadata for the topic is available
ClusterAndWaitTime clusterAndWaitTime;
try {
clusterAndWaitTime = waitOnMetadata(record.topic(), record.partition(), maxBlockTimeMs);
} catch (KafkaException e) {
if (metadata.isClosed())
throw new KafkaException("Producer closed while send in progress", e);
throw e;
}
long remainingWaitMs = Math.max(0, maxBlockTimeMs - clusterAndWaitTime.waitedOnMetadataMs);
Cluster cluster = clusterAndWaitTime.cluster;
byte[] serializedKey;
try {
serializedKey = keySerializer.serialize(record.topic(), record.headers(), record.key());
} catch (ClassCastException cce) {
throw new SerializationException("Can't convert key of class " + record.key().getClass().getName() +
" to class " + producerConfig.getClass(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG).getName() +
" specified in key.serializer", cce);
}
byte[] serializedValue;
try {
serializedValue = valueSerializer.serialize(record.topic(), record.headers(), record.value());
} catch (ClassCastException cce) {
throw new SerializationException("Can't convert value of class " + record.value().getClass().getName() +
" to class " + producerConfig.getClass(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG).getName() +
" specified in value.serializer", cce);
}
int partition = partition(record, serializedKey, serializedValue, cluster);
tp = new TopicPartition(record.topic(), partition);
setReadOnly(record.headers());
Header[] headers = record.headers().toArray();
int serializedSize = AbstractRecords.estimateSizeInBytesUpperBound(apiVersions.maxUsableProduceMagic(),
compressionType, serializedKey, serializedValue, headers);
ensureValidRecordSize(serializedSize);
long timestamp = record.timestamp() == null ? time.milliseconds() : record.timestamp();
if (log.isTraceEnabled()) {
log.trace("Attempting to append record {} with callback {} to topic {} partition {}", record, callback, record.topic(), partition);
}
// producer callback will make sure to call both 'callback' and interceptor callback
Callback interceptCallback = new InterceptorCallback<>(callback, this.interceptors, tp);
if (transactionManager != null && transactionManager.isTransactional()) {
transactionManager.failIfNotReadyForSend();
}
RecordAccumulator.RecordAppendResult result = accumulator.append(tp, timestamp, serializedKey,
serializedValue, headers, interceptCallback, remainingWaitMs, true);
if (result.abortForNewBatch) {
int prevPartition = partition;
partitioner.onNewBatch(record.topic(), cluster, prevPartition);
partition = partition(record, serializedKey, serializedValue, cluster);
tp = new TopicPartition(record.topic(), partition);
if (log.isTraceEnabled()) {
log.trace("Retrying append due to new batch creation for topic {} partition {}. The old partition was {}", record.topic(), partition, prevPartition);
}
// producer callback will make sure to call both 'callback' and interceptor callback
interceptCallback = new InterceptorCallback<>(callback, this.interceptors, tp);
result = accumulator.append(tp, timestamp, serializedKey,
serializedValue, headers, interceptCallback, remainingWaitMs, false);
}
if (transactionManager != null && transactionManager.isTransactional())
transactionManager.maybeAddPartitionToTransaction(tp);
if (result.batchIsFull || result.newBatchCreated) {
log.trace("Waking up the sender since topic {} partition {} is either full or getting a new batch", record.topic(), partition);
this.sender.wakeup();
}
return result.future;
// handling exceptions and record the errors;
// for API exceptions return them in the future,
// for other exceptions throw directly
} catch (ApiException e) {
log.debug("Exception occurred during message send:", e);
if (callback != null)
callback.onCompletion(null, e);
this.errors.record();
this.interceptors.onSendError(record, tp, e);
return new FutureFailure(e);
} catch (InterruptedException e) {
this.errors.record();
this.interceptors.onSendError(record, tp, e);
throw new InterruptException(e);
} catch (BufferExhaustedException e) {
this.errors.record();
this.metrics.sensor("buffer-exhausted-records").record();
this.interceptors.onSendError(record, tp, e);
throw e;
} catch (KafkaException e) {
this.errors.record();
this.interceptors.onSendError(record, tp, e);
throw e;
} catch (Exception e) {
// we notify interceptor about all exceptions, since onSend is called before anything else in this method
this.interceptors.onSendError(record, tp, e);
throw e;
}
}
private void setReadOnly(Headers headers) {
if (headers instanceof RecordHeaders) {
((RecordHeaders) headers).setReadOnly();
}
}
/**
* Wait for cluster metadata including partitions for the given topic to be available.
* @param topic The topic we want metadata for
* @param partition A specific partition expected to exist in metadata, or null if there's no preference
* @param maxWaitMs The maximum time in ms for waiting on the metadata
* @return The cluster containing topic metadata and the amount of time we waited in ms
* @throws KafkaException for all Kafka-related exceptions, including the case where this method is called after producer close
*/
private ClusterAndWaitTime waitOnMetadata(String topic, Integer partition, long maxWaitMs) throws InterruptedException {
// add topic to metadata topic list if it is not there already and reset expiry
Cluster cluster = metadata.fetch();
if (cluster.invalidTopics().contains(topic))
throw new InvalidTopicException(topic);
metadata.add(topic);
Integer partitionsCount = cluster.partitionCountForTopic(topic);
// Return cached metadata if we have it, and if the record's partition is either undefined
// or within the known partition range
if (partitionsCount != null && (partition == null || partition < partitionsCount))
return new ClusterAndWaitTime(cluster, 0);
long begin = time.milliseconds();
long remainingWaitMs = maxWaitMs;
long elapsed;
// Issue metadata requests until we have metadata for the topic and the requested partition,
// or until maxWaitTimeMs is exceeded. This is necessary in case the metadata
// is stale and the number of partitions for this topic has increased in the meantime.
do {
if (partition != null) {
log.trace("Requesting metadata update for partition {} of topic {}.", partition, topic);
} else {
log.trace("Requesting metadata update for topic {}.", topic);
}
metadata.add(topic);
int version = metadata.requestUpdate();
sender.wakeup();
try {
metadata.awaitUpdate(version, remainingWaitMs);
} catch (TimeoutException ex) {
// Rethrow with original maxWaitMs to prevent logging exception with remainingWaitMs
throw new TimeoutException(
String.format("Topic %s not present in metadata after %d ms.",
topic, maxWaitMs));
}
cluster = metadata.fetch();
elapsed = time.milliseconds() - begin;
if (elapsed >= maxWaitMs) {
throw new TimeoutException(partitionsCount == null ?
String.format("Topic %s not present in metadata after %d ms.",
topic, maxWaitMs) :
String.format("Partition %d of topic %s with partition count %d is not present in metadata after %d ms.",
partition, topic, partitionsCount, maxWaitMs));
}
metadata.maybeThrowExceptionForTopic(topic);
remainingWaitMs = maxWaitMs - elapsed;
partitionsCount = cluster.partitionCountForTopic(topic);
} while (partitionsCount == null || (partition != null && partition >= partitionsCount));
return new ClusterAndWaitTime(cluster, elapsed);
}
/**
* Validate that the record size isn't too large
*/
private void ensureValidRecordSize(int size) {
if (size > this.maxRequestSize)
throw new RecordTooLargeException("The message is " + size +
" bytes when serialized which is larger than the maximum request size you have configured with the " +
ProducerConfig.MAX_REQUEST_SIZE_CONFIG +
" configuration.");
if (size > this.totalMemorySize)
throw new RecordTooLargeException("The message is " + size +
" bytes when serialized which is larger than the total memory buffer you have configured with the " +
ProducerConfig.BUFFER_MEMORY_CONFIG +
" configuration.");
}
/**
* Invoking this method makes all buffered records immediately available to send (even if linger.ms is
* greater than 0) and blocks on the completion of the requests associated with these records. The post-condition
* of flush() is that any previously sent record will have completed (e.g. Future.isDone() == true).
* A request is considered completed when it is successfully acknowledged
* according to the acks configuration you have specified or else it results in an error.
*
* Other threads can continue sending records while one thread is blocked waiting for a flush call to complete,
* however no guarantee is made about the completion of records sent after the flush call begins.
*
* This method can be useful when consuming from some input system and producing into Kafka. The flush() call
* gives a convenient way to ensure all previously sent messages have actually completed.
*
* This example shows how to consume from one Kafka topic and produce to another Kafka topic:
*
* {@code
* for(ConsumerRecord record: consumer.poll(100))
* producer.send(new ProducerRecord("my-topic", record.key(), record.value());
* producer.flush();
* consumer.commit();
* }
*
*
* Note that the above example may drop records if the produce request fails. If we want to ensure that this does not occur
* we need to set retries=<large_number> in our config.
*
*
* Applications don't need to call this method for transactional producers, since the {@link #commitTransaction()} will
* flush all buffered records before performing the commit. This ensures that all the {@link #send(ProducerRecord)}
* calls made since the previous {@link #beginTransaction()} are completed before the commit.
*
*
* @throws InterruptException If the thread is interrupted while blocked
*/
@Override
public void flush() {
log.trace("Flushing accumulated records in producer.");
this.accumulator.beginFlush();
this.sender.wakeup();
try {
this.accumulator.awaitFlushCompletion();
} catch (InterruptedException e) {
throw new InterruptException("Flush interrupted.", e);
}
}
/**
* Get the partition metadata for the given topic. This can be used for custom partitioning.
* @throws AuthenticationException if authentication fails. See the exception for more details
* @throws AuthorizationException if not authorized to the specified topic. See the exception for more details
* @throws InterruptException if the thread is interrupted while blocked
* @throws TimeoutException if metadata could not be refreshed within {@code max.block.ms}
* @throws KafkaException for all Kafka-related exceptions, including the case where this method is called after producer close
*/
@Override
public List partitionsFor(String topic) {
Objects.requireNonNull(topic, "topic cannot be null");
try {
return waitOnMetadata(topic, null, maxBlockTimeMs).cluster.partitionsForTopic(topic);
} catch (InterruptedException e) {
throw new InterruptException(e);
}
}
/**
* Get the full set of internal metrics maintained by the producer.
*/
@Override
public Map metrics() {
return Collections.unmodifiableMap(this.metrics.metrics());
}
/**
* Close this producer. This method blocks until all previously sent requests complete.
* This method is equivalent to close(Long.MAX_VALUE, TimeUnit.MILLISECONDS).
*
* If close() is called from {@link Callback}, a warning message will be logged and close(0, TimeUnit.MILLISECONDS)
* will be called instead. We do this because the sender thread would otherwise try to join itself and
* block forever.
*
*
* @throws InterruptException If the thread is interrupted while blocked
*/
@Override
public void close() {
close(Duration.ofMillis(Long.MAX_VALUE));
}
/**
* This method waits up to timeout for the producer to complete the sending of all incomplete requests.
*
* If the producer is unable to complete all requests before the timeout expires, this method will fail
* any unsent and unacknowledged records immediately. It will also abort the ongoing transaction if it's not
* already completing.
*
* If invoked from within a {@link Callback} this method will not block and will be equivalent to
* close(Duration.ofMillis(0)). This is done since no further sending will happen while
* blocking the I/O thread of the producer.
*
* @param timeout The maximum time to wait for producer to complete any pending requests. The value should be
* non-negative. Specifying a timeout of zero means do not wait for pending send requests to complete.
* @throws InterruptException If the thread is interrupted while blocked
* @throws IllegalArgumentException If the timeout is negative.
*
*/
@Override
public void close(Duration timeout) {
close(timeout, false);
}
private void close(Duration timeout, boolean swallowException) {
long timeoutMs = timeout.toMillis();
if (timeoutMs < 0)
throw new IllegalArgumentException("The timeout cannot be negative.");
log.info("Closing the Kafka producer with timeoutMillis = {} ms.", timeoutMs);
// this will keep track of the first encountered exception
AtomicReference firstException = new AtomicReference<>();
boolean invokedFromCallback = Thread.currentThread() == this.ioThread;
if (timeoutMs > 0) {
if (invokedFromCallback) {
log.warn("Overriding close timeout {} ms to 0 ms in order to prevent useless blocking due to self-join. " +
"This means you have incorrectly invoked close with a non-zero timeout from the producer call-back.",
timeoutMs);
} else {
// Try to close gracefully.
if (this.sender != null)
this.sender.initiateClose();
if (this.ioThread != null) {
try {
this.ioThread.join(timeoutMs);
} catch (InterruptedException t) {
firstException.compareAndSet(null, new InterruptException(t));
log.error("Interrupted while joining ioThread", t);
}
}
}
}
if (this.sender != null && this.ioThread != null && this.ioThread.isAlive()) {
log.info("Proceeding to force close the producer since pending requests could not be completed " +
"within timeout {} ms.", timeoutMs);
this.sender.forceClose();
// Only join the sender thread when not calling from callback.
if (!invokedFromCallback) {
try {
this.ioThread.join();
} catch (InterruptedException e) {
firstException.compareAndSet(null, new InterruptException(e));
}
}
}
Utils.closeQuietly(interceptors, "producer interceptors", firstException);
Utils.closeQuietly(metrics, "producer metrics", firstException);
Utils.closeQuietly(keySerializer, "producer keySerializer", firstException);
Utils.closeQuietly(valueSerializer, "producer valueSerializer", firstException);
Utils.closeQuietly(partitioner, "producer partitioner", firstException);
AppInfoParser.unregisterAppInfo(JMX_PREFIX, clientId, metrics);
Throwable exception = firstException.get();
if (exception != null && !swallowException) {
if (exception instanceof InterruptException) {
throw (InterruptException) exception;
}
throw new KafkaException("Failed to close kafka producer", exception);
}
log.debug("Kafka producer has been closed");
}
private static Map propsToMap(Properties properties) {
Map map = new HashMap<>(properties.size());
for (Map.Entry entry : properties.entrySet()) {
if (entry.getKey() instanceof String) {
String k = (String) entry.getKey();
map.put(k, properties.get(k));
} else {
throw new ConfigException(entry.getKey().toString(), entry.getValue(), "Key must be a string.");
}
}
return map;
}
private ClusterResourceListeners configureClusterResourceListeners(Serializer keySerializer, Serializer valueSerializer, List... candidateLists) {
ClusterResourceListeners clusterResourceListeners = new ClusterResourceListeners();
for (List candidateList: candidateLists)
clusterResourceListeners.maybeAddAll(candidateList);
clusterResourceListeners.maybeAdd(keySerializer);
clusterResourceListeners.maybeAdd(valueSerializer);
return clusterResourceListeners;
}
/**
* computes partition for given record.
* if the record has partition returns the value otherwise
* calls configured partitioner class to compute the partition.
*/
private int partition(ProducerRecord record, byte[] serializedKey, byte[] serializedValue, Cluster cluster) {
Integer partition = record.partition();
return partition != null ?
partition :
partitioner.partition(
record.topic(), record.key(), serializedKey, record.value(), serializedValue, cluster);
}
private void throwIfNoTransactionManager() {
if (transactionManager == null)
throw new IllegalStateException("Cannot use transactional methods without enabling transactions " +
"by setting the " + ProducerConfig.TRANSACTIONAL_ID_CONFIG + " configuration property");
}
// Visible for testing
String getClientId() {
return clientId;
}
private static class ClusterAndWaitTime {
final Cluster cluster;
final long waitedOnMetadataMs;
ClusterAndWaitTime(Cluster cluster, long waitedOnMetadataMs) {
this.cluster = cluster;
this.waitedOnMetadataMs = waitedOnMetadataMs;
}
}
private static class FutureFailure implements Future {
private final ExecutionException exception;
public FutureFailure(Exception exception) {
this.exception = new ExecutionException(exception);
}
@Override
public boolean cancel(boolean interrupt) {
return false;
}
@Override
public RecordMetadata get() throws ExecutionException {
throw this.exception;
}
@Override
public RecordMetadata get(long timeout, TimeUnit unit) throws ExecutionException {
throw this.exception;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return true;
}
}
/**
* A callback called when producer request is complete. It in turn calls user-supplied callback (if given) and
* notifies producer interceptors about the request completion.
*/
private static class InterceptorCallback implements Callback {
private final Callback userCallback;
private final ProducerInterceptors interceptors;
private final TopicPartition tp;
private InterceptorCallback(Callback userCallback, ProducerInterceptors interceptors, TopicPartition tp) {
this.userCallback = userCallback;
this.interceptors = interceptors;
this.tp = tp;
}
public void onCompletion(RecordMetadata metadata, Exception exception) {
metadata = metadata != null ? metadata : new RecordMetadata(tp, -1, -1, RecordBatch.NO_TIMESTAMP, Long.valueOf(-1L), -1, -1);
this.interceptors.onAcknowledgement(metadata, exception);
if (this.userCallback != null)
this.userCallback.onCompletion(metadata, exception);
}
}
}