sealed abstract class ConsumerSettings[F[_], K, V] extends AnyRef

ConsumerSettings contain settings necessary to create a KafkaConsumer. At the very least, this includes key and value deserializers.

The following consumer configuration defaults are used.
- auto.offset.reset is set to none to avoid the surprise of the otherwise default latest setting.
- enable.auto.commit is set to false since offset commits are managed manually.

Several convenience functions are provided so that you don't have to work with String values and ConsumerConfig for configuration. It's still possible to specify ConsumerConfig values with functions like withProperty.

ConsumerSettings instances are immutable and all modification functions return a new ConsumerSettings instance.

Use ConsumerSettings#apply to create a new instance.

Source
ConsumerSettings.scala
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Abstract Value Members

  1. abstract def closeTimeout: FiniteDuration

    The time to wait for the Java KafkaConsumer to shutdown.

    The default value is 20 seconds.

  2. abstract def commitRecovery: CommitRecovery

    The CommitRecovery strategy for recovering from offset commit exceptions.

    The default is CommitRecovery#Default.

  3. abstract def commitTimeout: FiniteDuration

    The time to wait for offset commits to complete.

    The time to wait for offset commits to complete. If an offset commit doesn't complete within this time, a CommitTimeoutException will be raised instead.

    The default value is 15 seconds.

  4. abstract def customBlockingContext: Option[ExecutionContext]

    A custom ExecutionContext to use for blocking Kafka operations.

    A custom ExecutionContext to use for blocking Kafka operations. If not provided, a default single-threaded ExecutionContext will be created when creating a KafkaConsumer instance.

  5. abstract def keyDeserializer: F[Deserializer[F, K]]

    The Deserializer to use for deserializing record keys.

  6. abstract def maxPrefetchBatches: Int

    The maximum number of record batches to prefetch per topic-partition.

    The maximum number of record batches to prefetch per topic-partition. This means that, while records are being processed, there can be up to maxPrefetchBatches * max.poll.records records per topic-partition that have already been fetched, and are waiting to be processed. You can use withMaxPollRecords to control the max.poll.records setting.

    This setting effectively controls backpressure, i.e. the maximum number of batches to prefetch per topic-parititon before starting to slow down (not fetching more records) until processing has caught-up.

    Note that prefetching cannot be disabled and is generally preferred since it yields improved performance. The minimum value for this setting is 2.

  7. abstract def pollInterval: FiniteDuration

    How often we should attempt to call poll on the Java KafkaConsumer.

    The default value is 50 milliseconds.

  8. abstract def pollTimeout: FiniteDuration

    How long we should allow the poll call to block for in the Java KafkaConsumer.

    The default value is 50 milliseconds.

  9. abstract def properties: Map[String, String]

    Properties which can be provided when creating a Java KafkaConsumer instance.

    Properties which can be provided when creating a Java KafkaConsumer instance. Numerous functions in ConsumerSettings add properties here if the settings are used by the Java KafkaConsumer.

  10. abstract def recordMetadata: (ConsumerRecord[K, V]) => String

    The function used to specify metadata for records.

    The function used to specify metadata for records. This metadata will be included in OffsetAndMetadata in the CommittableOffsets, and can then be committed with the offsets.

    By default, there will be no metadata, as determined by OffsetFetchResponse.NO_METADATA.

  11. abstract def valueDeserializer: F[Deserializer[F, V]]

    The Deserializer to use for deserializing record values.

  12. abstract def withAllowAutoCreateTopics(allowAutoCreateTopics: Boolean): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified allow auto create topics.

    Returns a new ConsumerSettings instance with the specified allow auto create topics. This is equivalent to setting the following property using the withProperty function, except you can specify it with a Boolean instead of a String.

    ConsumerConfig.ALLOW_AUTO_CREATE_TOPICS_CONFIG
  13. abstract def withAutoCommitInterval(autoCommitInterval: FiniteDuration): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified auto commit interval.

    Returns a new ConsumerSettings instance with the specified auto commit interval. This is equivalent to setting the following property using the withProperty function, except you can specify it with a FiniteDuration instead of a String.

    ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG
  14. abstract def withAutoOffsetReset(autoOffsetReset: AutoOffsetReset): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified auto offset reset.

    Returns a new ConsumerSettings instance with the specified auto offset reset. This is equivalent to setting the following property using the withProperty function, except you can specify it with AutoOffsetReset instead of a String.

    ConsumerConfig.AUTO_OFFSET_RESET_CONFIG
  15. abstract def withBootstrapServers(bootstrapServers: String): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified bootstrap servers.

    Returns a new ConsumerSettings instance with the specified bootstrap servers. This is equivalent to setting the following property using the withProperty function.

    ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG
  16. abstract def withClientId(clientId: String): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified client id.

    Returns a new ConsumerSettings instance with the specified client id. This is equivalent to setting the following property using the withProperty function.

    ConsumerConfig.CLIENT_ID_CONFIG
  17. abstract def withClientRack(clientRack: String): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified client rack.

    Returns a new ConsumerSettings instance with the specified client rack. This is equivalent to setting the following property using the withProperty function.

    ConsumerConfig.CLIENT_RACK_CONFIG
  18. abstract def withCloseTimeout(closeTimeout: FiniteDuration): ConsumerSettings[F, K, V]

    Creates a new ConsumerSettings with the specified closeTimeout.

  19. abstract def withCommitRecovery(commitRecovery: CommitRecovery): ConsumerSettings[F, K, V]

    Creates a new ConsumerSettings with the specified CommitRecovery as the commitRecovery to use.

  20. abstract def withCommitTimeout(commitTimeout: FiniteDuration): ConsumerSettings[F, K, V]

    Creates a new ConsumerSettings with the specified commitTimeout.

  21. abstract def withCredentials(credentialsStore: KafkaCredentialStore): ConsumerSettings[F, K, V]

    Includes the credentials properties from the provided KafkaCredentialStore

  22. abstract def withCustomBlockingContext(ec: ExecutionContext): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified ExecutionContext to use for blocking operations.

    Returns a new ConsumerSettings instance with the specified ExecutionContext to use for blocking operations.

    Because the underlying Java consumer is not thread-safe, the ExecutionContext *must* be single-threaded. If in doubt, leave this unset so that a default single-threaded blocker will be provided.

  23. abstract def withDefaultApiTimeout(defaultApiTimeout: FiniteDuration): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified default api timeout.

    Returns a new ConsumerSettings instance with the specified default api timeout. This is equivalent to setting the following property using the withProperty function, except you can specify it with a FiniteDuration instead of a String.

    ConsumerConfig.DEFAULT_API_TIMEOUT_MS_CONFIG
  24. abstract def withEnableAutoCommit(enableAutoCommit: Boolean): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified auto commit setting.

    Returns a new ConsumerSettings instance with the specified auto commit setting. This is equivalent to setting the following property using the withProperty function, except you can specify it with a Boolean instead of a String.

    ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG

    Note that by default, this setting is set to false.

  25. abstract def withGroupId(groupId: String): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified group id.

    Returns a new ConsumerSettings instance with the specified group id. This is equivalent to setting the following property using the withProperty function.

    ConsumerConfig.GROUP_ID_CONFIG
  26. abstract def withGroupInstanceId(groupInstanceId: String): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified group instance id.

    Returns a new ConsumerSettings instance with the specified group instance id. This is equivalent to setting the following property using the withProperty function.

    ConsumerConfig.GROUP_INSTANCE_ID_CONFIG
  27. abstract def withHeartbeatInterval(heartbeatInterval: FiniteDuration): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified heartbeat interval.

    Returns a new ConsumerSettings instance with the specified heartbeat interval. This is equivalent to setting the following property using the withProperty function, except you can specify it with a FiniteDuration instead of a String.

    ConsumerConfig.HEARTBEAT_INTERVAL_MS_CONFIG
  28. abstract def withIsolationLevel(isolationLevel: IsolationLevel): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified isolation level.

    Returns a new ConsumerSettings instance with the specified isolation level. This is equivalent to setting the following property using the withProperty function, except you can specify it with an IsolationLevel instead of a String.

    ConsumerConfig.ISOLATION_LEVEL_CONFIG
  29. abstract def withMaxPollInterval(maxPollInterval: FiniteDuration): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified max poll interval.

    Returns a new ConsumerSettings instance with the specified max poll interval. This is equivalent to setting the following property using the withProperty function, except you can specify it with a FiniteDuration instead of a String.

    ConsumerConfig.MAX_POLL_INTERVAL_MS_CONFIG
  30. abstract def withMaxPollRecords(maxPollRecords: Int): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified max poll records.

    Returns a new ConsumerSettings instance with the specified max poll records. This is equivalent to setting the following property using the withProperty function, except you can specify it with an Int instead of a String.

    ConsumerConfig.MAX_POLL_RECORDS_CONFIG
  31. abstract def withMaxPrefetchBatches(maxPrefetchBatches: Int): ConsumerSettings[F, K, V]

    Creates a new ConsumerSettings with the specified value for maxPrefetchBatches.

    Creates a new ConsumerSettings with the specified value for maxPrefetchBatches. Note that if a value lower than the minimum 2 is specified, maxPrefetchBatches will instead be set to 2 and not the specified value.

  32. abstract def withPollInterval(pollInterval: FiniteDuration): ConsumerSettings[F, K, V]

    Creates a new ConsumerSettings with the specified pollInterval.

  33. abstract def withPollTimeout(pollTimeout: FiniteDuration): ConsumerSettings[F, K, V]

    Creates a new ConsumerSettings with the specified pollTimeout.

  34. abstract def withProperties(properties: Map[String, String]): ConsumerSettings[F, K, V]

    Includes the specified keys and values as properties.

    Includes the specified keys and values as properties. The keys should be part of the ConsumerConfig keys, and the values should be valid choices for the keys.

  35. abstract def withProperties(properties: (String, String)*): ConsumerSettings[F, K, V]

    Includes the specified keys and values as properties.

    Includes the specified keys and values as properties. The keys should be part of the ConsumerConfig keys, and the values should be valid choices for the keys.

  36. abstract def withProperty(key: String, value: String): ConsumerSettings[F, K, V]

    Includes a property with the specified key and value.

    Includes a property with the specified key and value. The key should be one of the keys in ConsumerConfig, and the value should be a valid choice for the key.

  37. abstract def withRecordMetadata(recordMetadata: (ConsumerRecord[K, V]) => String): ConsumerSettings[F, K, V]

    Creates a new ConsumerSettings with the specified recordMetadata.

  38. abstract def withRequestTimeout(requestTimeout: FiniteDuration): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified request timeout.

    Returns a new ConsumerSettings instance with the specified request timeout. This is equivalent to setting the following property using the withProperty function, except you can specify it with a FiniteDuration instead of a String.

    ConsumerConfig.REQUEST_TIMEOUT_MS_CONFIG
  39. abstract def withSessionTimeout(sessionTimeout: FiniteDuration): ConsumerSettings[F, K, V]

    Returns a new ConsumerSettings instance with the specified session timeout.

    Returns a new ConsumerSettings instance with the specified session timeout. This is equivalent to setting the following property using the withProperty function, except you can specify it with a FiniteDuration instead of a String.

    ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG

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