akka · seglo · Oct 29, 2019 · Oct 24, 2019
diff --git a/core/src/main/resources/reference.conf b/core/src/main/resources/reference.conf
@@ -22,6 +22,10 @@ akka.kafka.producer {
   # Duration to wait for `KafkaProducer.close` to finish.
   close-timeout = 60s
 
+  # Call `KafkaProducer.close` when the stream is shutdown. This is important to override to false
+  # when the producer instance is shared across multiple producer stages.
+  close-on-producer-stop = true
+
   # Fully qualified config path which holds the dispatcher configuration
   # to be used by the producer stages. Some blocking may occur.
   # When this value is empty, the dispatcher configured for the stream

diff --git a/core/src/main/scala/akka/kafka/ProducerSettings.scala b/core/src/main/scala/akka/kafka/ProducerSettings.scala
@@ -61,6 +61,7 @@ object ProducerSettings {
       "Value serializer should be defined or declared in configuration"
     )
     val closeTimeout = config.getDuration("close-timeout").asScala
+    val closeOnProducerStop = config.getBoolean("close-on-producer-stop")
     val parallelism = config.getInt("parallelism")
     val dispatcher = config.getString("use-dispatcher")
     val eosCommitInterval = config.getDuration("eos-commit-interval").asScala
@@ -69,11 +70,12 @@ object ProducerSettings {
       keySerializer,
       valueSerializer,
       closeTimeout,
+      closeOnProducerStop,
       parallelism,
       dispatcher,
       eosCommitInterval,
       enrichAsync = None,
-      ProducerSettings.createKafkaProducer
+      producerFactorySync = None
     )
   }
 
@@ -156,7 +158,6 @@ object ProducerSettings {
     new KafkaProducer[K, V](settings.getProperties,
                             settings.keySerializerOpt.orNull,
                             settings.valueSerializerOpt.orNull)
-
 }
 
 /**
@@ -172,13 +173,20 @@ class ProducerSettings[K, V] @InternalApi private[kafka] (
     val keySerializerOpt: Option[Serializer[K]],
     val valueSerializerOpt: Option[Serializer[V]],
     val closeTimeout: FiniteDuration,
+    val closeProducerOnStop: Boolean,
     val parallelism: Int,
     val dispatcher: String,
     val eosCommitInterval: FiniteDuration,
     val enrichAsync: Option[ProducerSettings[K, V] => Future[ProducerSettings[K, V]]],
-    val producerFactory: ProducerSettings[K, V] => Producer[K, V]
+    val producerFactorySync: Option[ProducerSettings[K, V] => Producer[K, V]]
 ) {
 
+  @deprecated(
+    "Use createKafkaProducer(), createKafkaProducerAsync(), or createKafkaProducerCompletionStage() to get a new KafkaProducer",
+    "1.1.1"
+  )
+  def producerFactory: ProducerSettings[K, V] => Producer[K, V] = _ => createKafkaProducer()
+
   /**
    * A comma-separated list of host/port pairs to use for establishing the initial connection to the Kafka cluster.
    */
@@ -217,18 +225,25 @@ class ProducerSettings[K, V] @InternalApi private[kafka] (
     copy(properties = properties.updated(key, value))
 
   /**
-   * Duration to wait for `KafkaConsumer.close` to finish.
+   * Duration to wait for `KafkaProducer.close` to finish.
    */
   def withCloseTimeout(closeTimeout: FiniteDuration): ProducerSettings[K, V] =
     copy(closeTimeout = closeTimeout)
 
   /**
    * Java API:
-   * Duration to wait for `KafkaConsumer.close` to finish.
+   * Duration to wait for `KafkaProducer.close` to finish.
    */
   def withCloseTimeout(closeTimeout: java.time.Duration): ProducerSettings[K, V] =
     copy(closeTimeout = closeTimeout.asScala)
 
+  /**
+   * Call `KafkaProducer.close` on the [[org.apache.kafka.clients.producer.KafkaProducer]] when the producer stage
+   * receives a shutdown signal.
+   */
+  def withCloseProducerOnStop(closeProducerOnStop: Boolean): ProducerSettings[K, V] =
+    copy(closeProducerOnStop = closeProducerOnStop)
+
   /**
    * Tuning parameter of how many sends that can run in parallel.
    */
@@ -275,12 +290,20 @@ class ProducerSettings[K, V] @InternalApi private[kafka] (
   ): ProducerSettings[K, V] =
     copy(enrichAsync = Some((s: ProducerSettings[K, V]) => value.apply(s).toScala))
 
+  /**
+   * Replaces the default Kafka producer creation logic with an external producer. This will also set
+   * `closeProducerOnStop = false` by default.
+   */
+  def withProducer(
+      producer: Producer[K, V]
+  ): ProducerSettings[K, V] = copy(producerFactorySync = Some(_ => producer), closeProducerOnStop = false)
+
   /**
    * Replaces the default Kafka producer creation logic.
    */
   def withProducerFactory(
       factory: ProducerSettings[K, V] => Producer[K, V]
-  ): ProducerSettings[K, V] = copy(producerFactory = factory)
+  ): ProducerSettings[K, V] = copy(producerFactorySync = Some(factory))
 
   /**
    * Get the Kafka producer settings as map.
@@ -292,33 +315,36 @@ class ProducerSettings[K, V] @InternalApi private[kafka] (
       keySerializer: Option[Serializer[K]] = keySerializerOpt,
       valueSerializer: Option[Serializer[V]] = valueSerializerOpt,
       closeTimeout: FiniteDuration = closeTimeout,
+      closeProducerOnStop: Boolean = closeProducerOnStop,
       parallelism: Int = parallelism,
       dispatcher: String = dispatcher,
       eosCommitInterval: FiniteDuration = eosCommitInterval,
       enrichAsync: Option[ProducerSettings[K, V] => Future[ProducerSettings[K, V]]] = enrichAsync,
-      producerFactory: ProducerSettings[K, V] => Producer[K, V] = producerFactory
+      producerFactorySync: Option[ProducerSettings[K, V] => Producer[K, V]] = producerFactorySync
   ): ProducerSettings[K, V] =
     new ProducerSettings[K, V](properties,
                                keySerializer,
                                valueSerializer,
                                closeTimeout,
+                               closeProducerOnStop,
                                parallelism,
                                dispatcher,
                                eosCommitInterval,
                                enrichAsync,
-                               producerFactory)
+                               producerFactorySync)
 
   override def toString: String =
     "akka.kafka.ProducerSettings(" +
     s"properties=${properties.mkString(",")}," +
     s"keySerializer=$keySerializerOpt," +
     s"valueSerializer=$valueSerializerOpt," +
     s"closeTimeout=${closeTimeout.toCoarsest}," +
+    s"closeProducerOnStop=$closeProducerOnStop," +
     s"parallelism=$parallelism," +
     s"dispatcher=$dispatcher," +
-    s"eosCommitInterval=${eosCommitInterval.toCoarsest}" +
-    s"enrichAsync=${enrichAsync.map(_ => "needs to be applied")}" +
-    ")"
+    s"eosCommitInterval=${eosCommitInterval.toCoarsest}," +
+    s"enrichAsync=${enrichAsync.map(_ => "needs to be applied")}," +
+    s"producerFactorySync=${producerFactorySync.map(_ => "is defined").getOrElse("is undefined")})"
 
   /**
    * Applies `enrichAsync` to complement these settings from asynchronous sources.
@@ -339,7 +365,10 @@ class ProducerSettings[K, V] @InternalApi private[kafka] (
         "Asynchronous settings enrichment is set via `withEnrichAsync` or `withEnrichCompletionStage`, you must use `createKafkaProducerAsync` or `createKafkaProducerCompletionStage` to apply it"
       )
     } else {
-      producerFactory.apply(this)
+      producerFactorySync match {
+        case Some(factory) => factory.apply(this)
+        case _ => ProducerSettings.createKafkaProducer(this)
+      }
     }
 
   /**
@@ -349,7 +378,10 @@ class ProducerSettings[K, V] @InternalApi private[kafka] (
    * (without blocking for `enriched`).
    */
   def createKafkaProducerAsync()(implicit executionContext: ExecutionContext): Future[Producer[K, V]] =
-    enriched.map(producerFactory)
+    producerFactorySync match {
+      case Some(factory) => enriched.map(factory)
+      case _ => enriched.map(ProducerSettings.createKafkaProducer)
+    }
 
   /**
    * Java API.
@@ -360,6 +392,5 @@ class ProducerSettings[K, V] @InternalApi private[kafka] (
    * @param executor Executor for asynchronous producer creation
    */
   def createKafkaProducerCompletionStage(executor: Executor): CompletionStage[Producer[K, V]] =
-    enriched.map(producerFactory)(ExecutionContext.fromExecutor(executor)).toJava
-
+    createKafkaProducerAsync()(ExecutionContext.fromExecutor(executor)).toJava
 }
diff --git a/core/src/main/scala/akka/kafka/internal/DefaultProducerStage.scala b/core/src/main/scala/akka/kafka/internal/DefaultProducerStage.scala
@@ -11,6 +11,7 @@ import akka.Done
 import akka.annotation.InternalApi
 import akka.dispatch.ExecutionContexts
 import akka.kafka.ProducerMessage._
+import akka.kafka.ProducerSettings
 import akka.kafka.internal.ProducerStage.{MessageCallback, ProducerCompletionState}
 import akka.stream.ActorAttributes.SupervisionStrategy
 import akka.stream.Supervision.Decider
@@ -19,7 +20,6 @@ import akka.stream.stage._
 import org.apache.kafka.clients.producer.{Callback, Producer, RecordMetadata}
 
 import scala.concurrent.{ExecutionContext, Future, Promise}
-import scala.concurrent.duration.FiniteDuration
 import scala.util.control.NonFatal
 import scala.util.{Failure, Success, Try}
 
@@ -28,14 +28,12 @@ import scala.util.{Failure, Success, Try}
  */
 @InternalApi
 private[kafka] class DefaultProducerStage[K, V, P, IN <: Envelope[K, V, P], OUT <: Results[K, V, P]](
-    val closeTimeout: FiniteDuration,
-    val closeProducerOnStop: Boolean,
-    val producerProvider: ExecutionContext => Future[Producer[K, V]]
+    val settings: ProducerSettings[K, V]
 ) extends GraphStage[FlowShape[IN, Future[OUT]]]
     with ProducerStage[K, V, P, IN, OUT] {
 
   override def createLogic(inheritedAttributes: Attributes): GraphStageLogic =
-    new DefaultProducerStageLogic(this, producerProvider, inheritedAttributes)
+    new DefaultProducerStageLogic(this, inheritedAttributes)
 }
 
 /**
@@ -45,7 +43,6 @@ private[kafka] class DefaultProducerStage[K, V, P, IN <: Envelope[K, V, P], OUT
  */
 private class DefaultProducerStageLogic[K, V, P, IN <: Envelope[K, V, P], OUT <: Results[K, V, P]](
     stage: ProducerStage[K, V, P, IN, OUT],
-    producerFactory: ExecutionContext => Future[Producer[K, V]],
     inheritedAttributes: Attributes
 ) extends TimerGraphStageLogic(stage.shape)
     with StageLogging
@@ -68,7 +65,7 @@ private class DefaultProducerStageLogic[K, V, P, IN <: Envelope[K, V, P], OUT <:
 
   override def preStart(): Unit = {
     super.preStart()
-    val producerFuture = producerFactory(materializer.executionContext)
+    val producerFuture = stage.settings.createKafkaProducerAsync()(materializer.executionContext)
     producerFuture.value match {
       case Some(Success(p)) => assignProducer(p)
       case Some(Failure(e)) => failStage(e)
@@ -190,7 +187,7 @@ private class DefaultProducerStageLogic[K, V, P, IN <: Envelope[K, V, P], OUT <:
       else
         decider(exception) match {
           case Supervision.Stop =>
-            if (stage.closeProducerOnStop) {
+            if (stage.settings.closeProducerOnStop) {
               producer.close(0, TimeUnit.MILLISECONDS)
             }
             failStageCb.invoke(exception)
@@ -205,11 +202,11 @@ private class DefaultProducerStageLogic[K, V, P, IN <: Envelope[K, V, P], OUT <:
   override def postStop(): Unit = {
     log.debug("Stage completed")
 
-    if (stage.closeProducerOnStop && producer != null) {
+    if (stage.settings.closeProducerOnStop && producer != null) {
       try {
         // we do not have to check if producer was already closed in send-callback as `flush()` and `close()` are effectively no-ops in this case
         producer.flush()
-        producer.close(stage.closeTimeout.toMillis, TimeUnit.MILLISECONDS)
+        producer.close(stage.settings.closeTimeout.toMillis, TimeUnit.MILLISECONDS)
         log.debug("Producer closed")
       } catch {
         case NonFatal(ex) => log.error(ex, "Problem occurred during producer close")

diff --git a/core/src/main/scala/akka/kafka/internal/ProducerStage.scala b/core/src/main/scala/akka/kafka/internal/ProducerStage.scala
@@ -9,11 +9,10 @@ import java.util.concurrent.atomic.AtomicInteger
 
 import akka.annotation.InternalApi
 import akka.kafka.ProducerMessage._
+import akka.kafka.ProducerSettings
 import akka.stream._
-import org.apache.kafka.clients.producer.Producer
 
-import scala.concurrent.{ExecutionContext, Future}
-import scala.concurrent.duration._
+import scala.concurrent.Future
 
 /**
  * INTERNAL API
@@ -22,9 +21,7 @@ import scala.concurrent.duration._
  */
 @InternalApi
 private[internal] trait ProducerStage[K, V, P, IN <: Envelope[K, V, P], OUT <: Results[K, V, P]] {
-  val closeTimeout: FiniteDuration
-  val closeProducerOnStop: Boolean
-  val producerProvider: ExecutionContext => Future[Producer[K, V]]
+  val settings: ProducerSettings[K, V]
 
   val in: Inlet[IN] = Inlet[IN]("messages")
   val out: Outlet[Future[OUT]] = Outlet[Future[OUT]]("result")

diff --git a/core/src/main/scala/akka/kafka/internal/TransactionalProducerStage.scala b/core/src/main/scala/akka/kafka/internal/TransactionalProducerStage.scala
@@ -4,20 +4,20 @@
  */
 
 package akka.kafka.internal
+
 import akka.Done
 import akka.annotation.InternalApi
-import akka.kafka.ConsumerMessage
 import akka.kafka.ConsumerMessage.{GroupTopicPartition, PartitionOffsetCommittedMarker}
 import akka.kafka.ProducerMessage.{Envelope, Results}
 import akka.kafka.internal.ProducerStage.{MessageCallback, ProducerCompletionState}
-import akka.stream.{Attributes, FlowShape}
+import akka.kafka.{ConsumerMessage, ProducerSettings}
 import akka.stream.stage._
+import akka.stream.{Attributes, FlowShape}
 import org.apache.kafka.clients.consumer.OffsetAndMetadata
 import org.apache.kafka.clients.producer.Producer
 import org.apache.kafka.common.TopicPartition
 
-import scala.concurrent.{ExecutionContext, Future}
-import scala.concurrent.duration.FiniteDuration
+import scala.concurrent.Future
 import scala.concurrent.duration._
 import scala.jdk.CollectionConverters._
 
@@ -26,15 +26,12 @@ import scala.jdk.CollectionConverters._
  */
 @InternalApi
 private[kafka] final class TransactionalProducerStage[K, V, P](
-    val closeTimeout: FiniteDuration,
-    val closeProducerOnStop: Boolean,
-    val producerProvider: ExecutionContext => Future[Producer[K, V]],
-    commitInterval: FiniteDuration
+    val settings: ProducerSettings[K, V]
 ) extends GraphStage[FlowShape[Envelope[K, V, P], Future[Results[K, V, P]]]]
     with ProducerStage[K, V, P, Envelope[K, V, P], Results[K, V, P]] {
 
   override def createLogic(inheritedAttributes: Attributes): GraphStageLogic =
-    new TransactionalProducerStageLogic(this, producerProvider, inheritedAttributes, commitInterval)
+    new TransactionalProducerStageLogic(this, inheritedAttributes)
 }
 
 /** Internal API */
@@ -100,12 +97,8 @@ private object TransactionalProducerStage {
  */
 private final class TransactionalProducerStageLogic[K, V, P](
     stage: TransactionalProducerStage[K, V, P],
-    producerFactory: ExecutionContext => Future[Producer[K, V]],
-    inheritedAttributes: Attributes,
-    commitInterval: FiniteDuration
-) extends DefaultProducerStageLogic[K, V, P, Envelope[K, V, P], Results[K, V, P]](stage,
-                                                                                    producerFactory,
-                                                                                    inheritedAttributes)
+    inheritedAttributes: Attributes
+) extends DefaultProducerStageLogic[K, V, P, Envelope[K, V, P], Results[K, V, P]](stage, inheritedAttributes)
     with StageLogging
     with MessageCallback[K, V, P]
     with ProducerCompletionState {
@@ -128,7 +121,7 @@ private final class TransactionalProducerStageLogic[K, V, P](
     initTransactions()
     beginTransaction()
     resumeDemand()
-    scheduleOnce(commitSchedulerKey, commitInterval)
+    scheduleOnce(commitSchedulerKey, stage.settings.eosCommitInterval)
   }
 
   // suspend demand until a Producer has been created
@@ -158,7 +151,7 @@ private final class TransactionalProducerStageLogic[K, V, P](
         suspendDemand()
         scheduleOnce(commitSchedulerKey, messageDrainInterval)
       case _ =>
-        scheduleOnce(commitSchedulerKey, commitInterval)
+        scheduleOnce(commitSchedulerKey, stage.settings.eosCommitInterval)
     }
   }
 
@@ -201,7 +194,7 @@ private final class TransactionalProducerStageLogic[K, V, P](
 
   val onInternalCommitAckCb: AsyncCallback[Unit] = {
     getAsyncCallback[Unit](
-      _ => scheduleOnce(commitSchedulerKey, commitInterval)
+      _ => scheduleOnce(commitSchedulerKey, stage.settings.eosCommitInterval)
     )
   }
 

diff --git a/core/src/main/scala/akka/kafka/javadsl/Committer.scala b/core/src/main/scala/akka/kafka/javadsl/Committer.scala
@@ -9,7 +9,7 @@ import java.util.concurrent.CompletionStage
 import akka.annotation.ApiMayChange
 import akka.japi.Pair
 import akka.{Done, NotUsed}
-import akka.kafka.ConsumerMessage.{Committable, CommittableOffset, CommittableOffsetBatch}
+import akka.kafka.ConsumerMessage.{Committable, CommittableOffsetBatch}
 import akka.kafka.{scaladsl, CommitterSettings}
 import akka.stream.javadsl.{Flow, FlowWithContext, Sink}