diff --git a/examples/exactly_once/.gitignore b/examples/exactly_once/.gitignore new file mode 100644 index 000000000..9f2dfaffb --- /dev/null +++ b/examples/exactly_once/.gitignore @@ -0,0 +1 @@ +exactly_once diff --git a/examples/exactly_once/README.md b/examples/exactly_once/README.md new file mode 100644 index 000000000..7e4025e9b --- /dev/null +++ b/examples/exactly_once/README.md @@ -0,0 +1,9 @@ +# Consumergroup example + +This example shows you how to use the Sarama transactional producer. The example simply starts consuming the given Kafka topics and logs the consumed messages to produce and commit in another topic. + +```bash +$ go run main.go -brokers="127.0.0.1:9092" -topics="sarama" -group="example" +``` + +You can also toggle (pause/resume) the consumption by sending SIGUSR1 \ No newline at end of file diff --git a/examples/exactly_once/go.mod b/examples/exactly_once/go.mod new file mode 100644 index 000000000..da3acccca --- /dev/null +++ b/examples/exactly_once/go.mod @@ -0,0 +1,7 @@ +module github.com/Shopify/sarama/examples/exactly_once + +go 1.16 + +require github.com/Shopify/sarama v1.34.1 + +replace github.com/Shopify/sarama => ../../ diff --git a/examples/exactly_once/go.sum b/examples/exactly_once/go.sum new file mode 100644 index 000000000..7e2a316c4 --- /dev/null +++ b/examples/exactly_once/go.sum @@ -0,0 +1,528 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod 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diff --git a/examples/exactly_once/main.go b/examples/exactly_once/main.go new file mode 100644 index 000000000..93cad3061 --- /dev/null +++ b/examples/exactly_once/main.go @@ -0,0 +1,301 @@ +package main + +// SIGUSR1 toggle the pause/resume consumption +import ( + "context" + "flag" + "fmt" + "log" + "os" + "os/signal" + "strings" + "sync" + "syscall" + "time" + + "github.com/Shopify/sarama" +) + +// Sarama configuration options +var ( + brokers = "" + version = "" + group = "" + topics = "" + destinationTopic = "" + assignor = "" + oldest = true + verbose = false +) + +func init() { + flag.StringVar(&brokers, "brokers", "", "Kafka bootstrap brokers to connect to, as a comma separated list") + flag.StringVar(&group, "group", "", "Kafka consumer group definition") + flag.StringVar(&version, "version", "2.6.0", "Kafka cluster version") + flag.StringVar(&topics, "topics", "", "Kafka topics to be consumed, as a comma separated list") + flag.StringVar(&destinationTopic, "destination-topics", "", "Kafka topics where records will be copied from topics.") + flag.StringVar(&assignor, "assignor", "range", "Consumer group partition assignment strategy (range, roundrobin, sticky)") + flag.BoolVar(&oldest, "oldest", true, "Kafka consumer consume initial offset from oldest") + flag.BoolVar(&verbose, "verbose", false, "Sarama logging") + flag.Parse() + + if len(brokers) == 0 { + panic("no Kafka bootstrap brokers defined, please set the -brokers flag") + } + + if len(topics) == 0 { + panic("no topics given to be consumed, please set the -topics flag") + } + + if len(destinationTopic) == 0 { + panic("no destination topics given to be consumed, please set the -destination-topics flag") + } + + if len(group) == 0 { + panic("no Kafka consumer group defined, please set the -group flag") + } +} + +func main() { + keepRunning := true + log.Println("Starting a new Sarama consumer") + + if verbose { + sarama.Logger = log.New(os.Stdout, "[sarama] ", log.LstdFlags) + } + + version, err := sarama.ParseKafkaVersion(version) + if err != nil { + log.Panicf("Error parsing Kafka version: %v", err) + } + + /** + * Construct a new Sarama configuration. + * The Kafka cluster version has to be defined before the consumer/producer is initialized. + */ + config := sarama.NewConfig() + config.Version = version + + config.Consumer.IsolationLevel = sarama.ReadCommitted + config.Consumer.Offsets.AutoCommit.Enable = false + + switch assignor { + case "sticky": + config.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategySticky + case "roundrobin": + config.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategyRoundRobin + case "range": + config.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategyRange + default: + log.Panicf("Unrecognized consumer group partition assignor: %s", assignor) + } + + if oldest { + config.Consumer.Offsets.Initial = sarama.OffsetOldest + } + + /** + * Setup a new Sarama consumer group + */ + consumer := Consumer{ + groupId: group, + brokers: strings.Split(brokers, ","), + configProvider: func(topic string, partition int32) *sarama.Config { + producerConfig := sarama.NewConfig() + producerConfig.Version = version + + producerConfig.Net.MaxOpenRequests = 1 + producerConfig.Producer.RequiredAcks = sarama.WaitForAll + producerConfig.Producer.Idempotent = true + producerConfig.Producer.Transaction.IDProvider = func() string { + return "sarama" + "-" + topic + "-" + fmt.Sprint(partition) + } + return producerConfig + }, + ready: make(chan bool), + } + + ctx, cancel := context.WithCancel(context.Background()) + client, err := sarama.NewConsumerGroup(strings.Split(brokers, ","), group, config) + if err != nil { + log.Panicf("Error creating consumer group client: %v", err) + } + + consumptionIsPaused := false + wg := &sync.WaitGroup{} + wg.Add(1) + go func() { + defer wg.Done() + for { + // `Consume` should be called inside an infinite loop, when a + // server-side rebalance happens, the consumer session will need to be + // recreated to get the new claims + if err := client.Consume(ctx, strings.Split(topics, ","), &consumer); err != nil { + log.Panicf("Error from consumer: %v", err) + } + // check if context was cancelled, signaling that the consumer should stop + if ctx.Err() != nil { + return + } + consumer.ready = make(chan bool) + } + }() + + <-consumer.ready // Await till the consumer has been set up + log.Println("Sarama consumer up and running!...") + + sigusr1 := make(chan os.Signal, 1) + signal.Notify(sigusr1, syscall.SIGUSR1) + + sigterm := make(chan os.Signal, 1) + signal.Notify(sigterm, syscall.SIGINT, syscall.SIGTERM) + + for keepRunning { + select { + case <-ctx.Done(): + log.Println("terminating: context cancelled") + keepRunning = false + case <-sigterm: + log.Println("terminating: via signal") + keepRunning = false + case <-sigusr1: + toggleConsumptionFlow(client, &consumptionIsPaused) + } + } + cancel() + wg.Wait() + + if err = client.Close(); err != nil { + log.Panicf("Error closing client: %v", err) + } +} + +func toggleConsumptionFlow(client sarama.ConsumerGroup, isPaused *bool) { + if *isPaused { + client.ResumeAll() + log.Println("Resuming consumption") + } else { + client.PauseAll() + log.Println("Pausing consumption") + } + + *isPaused = !*isPaused +} + +// Consumer represents a Sarama consumer group consumer +type Consumer struct { + ready chan bool + groupId string + brokers []string + configProvider func(topic string, partition int32) *sarama.Config +} + +// Setup is run at the beginning of a new session, before ConsumeClaim +func (consumer *Consumer) Setup(session sarama.ConsumerGroupSession) error { + // Mark the consumer as ready + close(consumer.ready) + return nil +} + +// Cleanup is run at the end of a session, once all ConsumeClaim goroutines have exited +func (consumer *Consumer) Cleanup(sarama.ConsumerGroupSession) error { + return nil +} + +// ConsumeClaim must start a consumer loop of ConsumerGroupClaim's Messages(). +func (consumer *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error { + // NOTE: + // Do not move the code below to a goroutine. + // The `ConsumeClaim` itself is called within a goroutine, see: + // https://github.com/Shopify/sarama/blob/main/consumer_group.go#L27-L2 + var producer sarama.AsyncProducer + defer consumer.closeProducer(producer) + for { + select { + case message := <-claim.Messages(): + for { + var err error + if producer == nil { + producer, err = sarama.NewAsyncProducer(consumer.brokers, consumer.configProvider(claim.Topic(), claim.Partition())) + if err != nil { + continue + } + go func() { + for err := range producer.Errors() { + log.Println("Failed to write access log entry:", err) + } + }() + } + startTime := time.Now() + // BeginTxn must be called before any messages + err = producer.BeginTxn() + if err != nil { + log.Printf("Message consumer: unable to start transaction: %+v", err) + continue + } + producer.Input() <- &sarama.ProducerMessage{ + Topic: destinationTopic, + Key: sarama.ByteEncoder(message.Key), + Value: sarama.ByteEncoder(message.Value), + } + // You can add current message to this transaction + err = producer.AddMessageToTxn(message, consumer.groupId, nil) + if err != nil { + log.Println("error on AddMessageToTxn") + producer = consumer.handleTxnError(producer, err, func() error { + return producer.AddMessageToTxn(message, consumer.groupId, nil) + }) + continue + } + + err = producer.CommitTxn() + if err != nil { + log.Println("error on CommitTxn") + producer = consumer.handleTxnError(producer, err, func() error { + return producer.CommitTxn() + }) + continue + } + log.Printf("Message claimed [%s]: value = %s, timestamp = %v, topic = %s, partition = %d", time.Since(startTime), string(message.Value), message.Timestamp, message.Topic, message.Partition) + break + } + // Should return when `session.Context()` is done. + // If not, will raise `ErrRebalanceInProgress` or `read tcp :: i/o timeout` when kafka rebalance. see: + // https://github.com/Shopify/sarama/issues/1192 + case <-session.Context().Done(): + return nil + } + } +} + +func (consumer *Consumer) handleTxnError(producer sarama.AsyncProducer, err error, defaulthandler func() error) sarama.AsyncProducer { + log.Printf("Message consumer: unable to process transaction: %+v", err) + for { + if producer.TxnStatus()&sarama.ProducerTxnFlagFatalError != 0 { + // fatal error. need to recreate producer. + log.Printf("Message consumer: producer is in a fatal state, need to recreate it") + consumer.closeProducer(producer) + return nil + } + if producer.TxnStatus()&sarama.ProducerTxnFlagAbortableError != 0 { + err = producer.AbortTxn() + if err != nil { + log.Printf("Message consumer: unable to abort transaction: %+v", err) + continue + } + return producer + } + // if not you can retry + err = defaulthandler() + if err == nil { + return producer + } + } +} + +func (consumer *Consumer) closeProducer(producer sarama.AsyncProducer) { + if producer != nil { + log.Println("Closing producer") + _ = producer.Close() + } +} diff --git a/examples/txn_producer/go.mod b/examples/txn_producer/go.mod index c7e61f1de..0b0027cb4 100644 --- a/examples/txn_producer/go.mod +++ b/examples/txn_producer/go.mod @@ -2,6 +2,9 @@ module github.com/Shopify/sarama/examples/txn_producer go 1.16 -require github.com/Shopify/sarama v1.34.1 +require ( + github.com/Shopify/sarama v1.34.1 + github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect +) replace github.com/Shopify/sarama => ../../ diff --git a/examples/txn_producer/main.go b/examples/txn_producer/main.go index 93cad3061..668939fc0 100644 --- a/examples/txn_producer/main.go +++ b/examples/txn_producer/main.go @@ -14,28 +14,27 @@ import ( "time" "github.com/Shopify/sarama" + "github.com/rcrowley/go-metrics" ) // Sarama configuration options var ( - brokers = "" - version = "" - group = "" - topics = "" - destinationTopic = "" - assignor = "" - oldest = true - verbose = false + brokers = "" + version = "" + topic = "" + producers = 1 + verbose = false + + transactionalProducer = true + recordsRate = metrics.GetOrRegisterMeter("records.rate", nil) ) func init() { flag.StringVar(&brokers, "brokers", "", "Kafka bootstrap brokers to connect to, as a comma separated list") - flag.StringVar(&group, "group", "", "Kafka consumer group definition") - flag.StringVar(&version, "version", "2.6.0", "Kafka cluster version") - flag.StringVar(&topics, "topics", "", "Kafka topics to be consumed, as a comma separated list") - flag.StringVar(&destinationTopic, "destination-topics", "", "Kafka topics where records will be copied from topics.") - flag.StringVar(&assignor, "assignor", "range", "Consumer group partition assignment strategy (range, roundrobin, sticky)") - flag.BoolVar(&oldest, "oldest", true, "Kafka consumer consume initial offset from oldest") + flag.StringVar(&version, "version", "0.11.0.0", "Kafka cluster version") + flag.StringVar(&topic, "topic", "", "Kafka topics where records will be copied from topics.") + flag.IntVar(&producers, "producers", 1, "Number of concurrent producers") + flag.BoolVar(&transactionalProducer, "transactional", true, "true if producer is transactional") flag.BoolVar(&verbose, "verbose", false, "Sarama logging") flag.Parse() @@ -43,22 +42,14 @@ func init() { panic("no Kafka bootstrap brokers defined, please set the -brokers flag") } - if len(topics) == 0 { - panic("no topics given to be consumed, please set the -topics flag") - } - - if len(destinationTopic) == 0 { - panic("no destination topics given to be consumed, please set the -destination-topics flag") - } - - if len(group) == 0 { - panic("no Kafka consumer group defined, please set the -group flag") + if len(topic) == 0 { + panic("no topic given to be consumed, please set the -topic flag") } } func main() { keepRunning := true - log.Println("Starting a new Sarama consumer") + log.Println("Starting a new Sarama producer") if verbose { sarama.Logger = log.New(os.Stdout, "[sarama] ", log.LstdFlags) @@ -69,80 +60,41 @@ func main() { log.Panicf("Error parsing Kafka version: %v", err) } - /** - * Construct a new Sarama configuration. - * The Kafka cluster version has to be defined before the consumer/producer is initialized. - */ - config := sarama.NewConfig() - config.Version = version - - config.Consumer.IsolationLevel = sarama.ReadCommitted - config.Consumer.Offsets.AutoCommit.Enable = false - - switch assignor { - case "sticky": - config.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategySticky - case "roundrobin": - config.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategyRoundRobin - case "range": - config.Consumer.Group.Rebalance.Strategy = sarama.BalanceStrategyRange - default: - log.Panicf("Unrecognized consumer group partition assignor: %s", assignor) - } + producerProvider := newProducerProvider(strings.Split(brokers, ","), func() *sarama.Config { + config := sarama.NewConfig() + config.Version = version + config.Producer.Idempotent = true + config.Producer.Return.Errors = false + config.Producer.RequiredAcks = sarama.WaitForAll + if transactionalProducer { + config.Producer.Transaction.ID = "txn_producer" + } else { + config.Producer.Return.Successes = true + } + config.Net.MaxOpenRequests = 1 + return config + }, transactionalProducer) - if oldest { - config.Consumer.Offsets.Initial = sarama.OffsetOldest - } - - /** - * Setup a new Sarama consumer group - */ - consumer := Consumer{ - groupId: group, - brokers: strings.Split(brokers, ","), - configProvider: func(topic string, partition int32) *sarama.Config { - producerConfig := sarama.NewConfig() - producerConfig.Version = version - - producerConfig.Net.MaxOpenRequests = 1 - producerConfig.Producer.RequiredAcks = sarama.WaitForAll - producerConfig.Producer.Idempotent = true - producerConfig.Producer.Transaction.IDProvider = func() string { - return "sarama" + "-" + topic + "-" + fmt.Sprint(partition) - } - return producerConfig - }, - ready: make(chan bool), - } + go metrics.Log(metrics.DefaultRegistry, 5*time.Second, log.New(os.Stderr, "metrics: ", log.Lmicroseconds)) ctx, cancel := context.WithCancel(context.Background()) - client, err := sarama.NewConsumerGroup(strings.Split(brokers, ","), group, config) - if err != nil { - log.Panicf("Error creating consumer group client: %v", err) - } - consumptionIsPaused := false - wg := &sync.WaitGroup{} - wg.Add(1) - go func() { - defer wg.Done() - for { - // `Consume` should be called inside an infinite loop, when a - // server-side rebalance happens, the consumer session will need to be - // recreated to get the new claims - if err := client.Consume(ctx, strings.Split(topics, ","), &consumer); err != nil { - log.Panicf("Error from consumer: %v", err) - } - // check if context was cancelled, signaling that the consumer should stop - if ctx.Err() != nil { - return - } - consumer.ready = make(chan bool) - } - }() + var wg sync.WaitGroup + for i := 0; i < producers; i++ { + wg.Add(1) + go func() { + defer wg.Done() - <-consumer.ready // Await till the consumer has been set up - log.Println("Sarama consumer up and running!...") + for { + select { + case <-ctx.Done(): + return + default: + produceTestRecord(producerProvider) + } + } + }() + } sigusr1 := make(chan os.Signal, 1) signal.Notify(sigusr1, syscall.SIGUSR1) @@ -151,151 +103,137 @@ func main() { signal.Notify(sigterm, syscall.SIGINT, syscall.SIGTERM) for keepRunning { - select { - case <-ctx.Done(): - log.Println("terminating: context cancelled") - keepRunning = false - case <-sigterm: - log.Println("terminating: via signal") - keepRunning = false - case <-sigusr1: - toggleConsumptionFlow(client, &consumptionIsPaused) - } + <-sigterm + log.Println("terminating: via signal") + keepRunning = false } cancel() wg.Wait() - if err = client.Close(); err != nil { - log.Panicf("Error closing client: %v", err) - } -} - -func toggleConsumptionFlow(client sarama.ConsumerGroup, isPaused *bool) { - if *isPaused { - client.ResumeAll() - log.Println("Resuming consumption") - } else { - client.PauseAll() - log.Println("Pausing consumption") - } - - *isPaused = !*isPaused -} - -// Consumer represents a Sarama consumer group consumer -type Consumer struct { - ready chan bool - groupId string - brokers []string - configProvider func(topic string, partition int32) *sarama.Config -} - -// Setup is run at the beginning of a new session, before ConsumeClaim -func (consumer *Consumer) Setup(session sarama.ConsumerGroupSession) error { - // Mark the consumer as ready - close(consumer.ready) - return nil + producerProvider.clear() } -// Cleanup is run at the end of a session, once all ConsumeClaim goroutines have exited -func (consumer *Consumer) Cleanup(sarama.ConsumerGroupSession) error { - return nil -} +func produceTestRecord(producerProvider *producerProvider) { + producer := producerProvider.borrow() + defer producerProvider.release(producer) -// ConsumeClaim must start a consumer loop of ConsumerGroupClaim's Messages(). -func (consumer *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error { - // NOTE: - // Do not move the code below to a goroutine. - // The `ConsumeClaim` itself is called within a goroutine, see: - // https://github.com/Shopify/sarama/blob/main/consumer_group.go#L27-L2 - var producer sarama.AsyncProducer - defer consumer.closeProducer(producer) - for { - select { - case message := <-claim.Messages(): + if producer.IsTransactional() { + err := producer.BeginTxn() + if err != nil { + log.Printf("unable to start txn %s\n", err) + return + } + } + producer.Input() <- &sarama.ProducerMessage{Topic: topic, Key: nil, Value: sarama.StringEncoder("test")} + if producer.IsTransactional() { + err := producer.CommitTxn() + if err != nil { + log.Printf("Producer: unable to commit txn %s\n", err) for { - var err error - if producer == nil { - producer, err = sarama.NewAsyncProducer(consumer.brokers, consumer.configProvider(claim.Topic(), claim.Partition())) + if producer.TxnStatus()&sarama.ProducerTxnFlagFatalError != 0 { + // fatal error. need to recreate producer. + log.Printf("Producer: producer is in a fatal state, need to recreate it") + break + } + if producer.TxnStatus()&sarama.ProducerTxnFlagAbortableError != 0 { + err = producer.AbortTxn() if err != nil { + log.Printf("Producer: unable to abort transaction: %+v", err) continue } - go func() { - for err := range producer.Errors() { - log.Println("Failed to write access log entry:", err) - } - }() - } - startTime := time.Now() - // BeginTxn must be called before any messages - err = producer.BeginTxn() - if err != nil { - log.Printf("Message consumer: unable to start transaction: %+v", err) - continue - } - producer.Input() <- &sarama.ProducerMessage{ - Topic: destinationTopic, - Key: sarama.ByteEncoder(message.Key), - Value: sarama.ByteEncoder(message.Value), - } - // You can add current message to this transaction - err = producer.AddMessageToTxn(message, consumer.groupId, nil) - if err != nil { - log.Println("error on AddMessageToTxn") - producer = consumer.handleTxnError(producer, err, func() error { - return producer.AddMessageToTxn(message, consumer.groupId, nil) - }) - continue + break } - + // if not you can retry err = producer.CommitTxn() if err != nil { - log.Println("error on CommitTxn") - producer = consumer.handleTxnError(producer, err, func() error { - return producer.CommitTxn() - }) + log.Printf("Producer: unable to commit txn %s\n", err) continue } - log.Printf("Message claimed [%s]: value = %s, timestamp = %v, topic = %s, partition = %d", time.Since(startTime), string(message.Value), message.Timestamp, message.Topic, message.Partition) - break } - // Should return when `session.Context()` is done. - // If not, will raise `ErrRebalanceInProgress` or `read tcp :: i/o timeout` when kafka rebalance. see: - // https://github.com/Shopify/sarama/issues/1192 - case <-session.Context().Done(): - return nil + return } + } else { + <-producer.Successes() } + recordsRate.Mark(1) +} + +type producerProvider struct { + isTransactional bool + transactionIdGenerator int32 + + producersLock sync.Mutex + nonTransactionalProducer sarama.AsyncProducer + producers []sarama.AsyncProducer + + producerProvider func() sarama.AsyncProducer } -func (consumer *Consumer) handleTxnError(producer sarama.AsyncProducer, err error, defaulthandler func() error) sarama.AsyncProducer { - log.Printf("Message consumer: unable to process transaction: %+v", err) - for { - if producer.TxnStatus()&sarama.ProducerTxnFlagFatalError != 0 { - // fatal error. need to recreate producer. - log.Printf("Message consumer: producer is in a fatal state, need to recreate it") - consumer.closeProducer(producer) +func newProducerProvider(brokers []string, producerConfigurationProvider func() *sarama.Config, isTransactional bool) *producerProvider { + provider := &producerProvider{ + isTransactional: isTransactional, + } + provider.producerProvider = func() sarama.AsyncProducer { + config := producerConfigurationProvider() + suffix := provider.transactionIdGenerator + if isTransactional { + provider.transactionIdGenerator++ + config.Producer.Transaction.ID = config.Producer.Transaction.ID + "-" + fmt.Sprint(suffix) + } + producer, err := sarama.NewAsyncProducer(brokers, config) + if err != nil { return nil } - if producer.TxnStatus()&sarama.ProducerTxnFlagAbortableError != 0 { - err = producer.AbortTxn() - if err != nil { - log.Printf("Message consumer: unable to abort transaction: %+v", err) - continue - } - return producer + return producer + } + return provider +} + +func (p *producerProvider) borrow() sarama.AsyncProducer { + p.producersLock.Lock() + defer p.producersLock.Unlock() + + var producer sarama.AsyncProducer + if p.isTransactional { + if len(p.producers) == 0 { + return p.producerProvider() + } + + index := len(p.producers) - 1 + producer = p.producers[index] + p.producers = p.producers[:index] + } else { + if p.nonTransactionalProducer == nil { + p.nonTransactionalProducer = p.producerProvider() } - // if not you can retry - err = defaulthandler() - if err == nil { - return producer + producer = p.nonTransactionalProducer + } + return producer +} + +func (p *producerProvider) release(producer sarama.AsyncProducer) { + p.producersLock.Lock() + defer p.producersLock.Unlock() + + if p.isTransactional { + if producer.TxnStatus()&sarama.ProducerTxnFlagInError != 0 { + // Try to close it + _ = producer.Close() + return } + p.producers = append(p.producers, producer) } } -func (consumer *Consumer) closeProducer(producer sarama.AsyncProducer) { - if producer != nil { - log.Println("Closing producer") - _ = producer.Close() +func (p *producerProvider) clear() { + p.producersLock.Lock() + defer p.producersLock.Unlock() + + for _, producer := range p.producers { + producer.Close() + } + p.producers = p.producers[:0] + if p.nonTransactionalProducer != nil { + p.nonTransactionalProducer.Close() } }