v1.0.1

• Support for Alpine Linux.
• New LogLevelType enum and functions to convert between different log level type levels.
• Added netstandard20 as a target.
• References librdkafka 1.0.1.

v1.0.0

1.0.0 is a major update of the API, introducing many new features and enhancements.
Note: The 1.0 API is not compatible with earlier versions of the library.

Feature highlights:

• Inherits all of the new features in librdkafka v1.0.0
• General improvements to client classes:
  • Strongly typed configuration.
  • Construction is via builder classes:
    • Allows/enforces that event handlers are specified at construction time.
    • More extensible.
  • Header support.
  • New Message class abstraction and related changes.
  • Consistency in error reporting across library (via exceptions).
  • Support for fatal errors.
• Added AdminClient:
  • CreateTopics, DeleteTopics, CreatePartitions, AlterConfigs, and DescribeConfigs methods.
  • Moved ListGroups and GetMetadata methods from the Producer and Consumer classes to AdminClient.
• Producer specific improvements:
  • New serialization interface:
    • Non-blocking support for async serializers.
    • Very flexible:
      • e.g. can be easily extended to support header serialization.
  • Capability to specify custom timestamps when producing messages.
  • Message persistence status support.
  • Renamed ProduceAsync variants with a callback to Produce.
• Consumer improvements:
  • A new rebalance API.
  • New deserialization API analogous to the new serialization API.
  • PartitionEOF notification is via ConsumeResult, not events.
    • EOF notification is now disabled by default. To enable, set the EnablePartitionEof config property to true.
• Confluent Schema Registry integration
  • Added support for basic authentication.
  • Added GET subject versions to the cached schema registry client.
  • Renamed Confluent.Kafka.Avro to Confluent.SchemaRegistry.Serdes in preparation for support for additional serialization formats.

v1.0.0-RC7

• Moved SyncOverAsync functionality to the Confluent.Kafka.SyncOverAsync namespace.
• Marked DependentProducerBuilder as API-SUBJECT-TO-CHANGE.
• No-op handlers are no longer registered with librdkafka if corresponding handlers are not specified in client builder classes.
• Renamed AsyncAvroSerializer to AvroSerializer and AsyncAvroDeserializer to AvroDeserializer

v1.0-RC6

New Features

• Added DependentAdminClientBuilder class.

Changes

• Reverted RC4 changes.
• Renamed AvroSerializer to AsyncAvroSerializer and AvroDeserializer to AsyncAvroDeserializer
• Added SyncOverAsyncSerializer and SyncOverAsyncDeserializer adapter classes.
• Added AsSyncOverAsync factory method to AsyncAvroSerializer and AsyncAvroDeserializer.
• Removed IAsyncDeserializer setter overloads from the ConsumerBuilder class.
• Renamed Producer.BeginProduce to Producer.Produce.
• Produce throws an exception if used when async serializers are configured.
• Made AdminClient, Producer, and Consumer classes internal.

v1.0-RC4

Changes

• Removed SerializationContext from non-async serde interfaces.
• Replaced ISerializer interface with Serializer delegate.
• Replaced IDeserializer interface with Deserializer delegate.

v1.0-RC3

New Features

• Producer.Poll can now be used with producer instances that are in background polling mode.
  • Typically use: Block for a minimal period of time following a ErrorCode.Local_QueueFull error.

Changes

• Removed the Confluent.Kafka.Serdes namespace.

Fixes

• Added CompressionType property to ProducerConfig class.

v1.0-RC2

New Features

• References librdkafka.redist v1.0.0

Changes

• Moved API docs from the client classes to their respective interfaces.
• Updated formatting of client API docs so they display well in Visual Studio Code intellisense.

v1.0-RC1

New Features

• Added GET subject versions to the cached schema registry client.
• References librdkafka.redist 1.0.0-RC9
  • supports apline linux out-of-the-box.
  • fallback support (that excludes security features) for most linux distributions previously unsuppored out-of-the-box.
  • fixed a dependency issue on MacOS

Changes

• A new rebalance API.
  • SetRebalanceHandler has been split into SetPartitionsAssignedHandler and SetPartitionsRevokedHandler.
  • Calling of Assign/Unassign in these handlers is prohibited.
  • Partitions to read from / start offsets can be optionally specified manually via the return value from these handlers.
• The Message.PersistenceStatus property name has changed to Message.Status.
• Moved the GetWatermarkOffsets and QueryWatermarkOffsets methods from admin client to consumer.
• Context is now provided to serdes via a SerializationContext class instance.
• All errors (that don't correspond to application logic errors) that occur as the result of a call to the produce and consume methods are now reported via exceptions of type ProduceException and ConsumeException.

Fixes

• Corrected an error in the rd_kafka_event_type method signature which was causing incompatibility with mono.
• Audited exception use across the library and made changes in various places where appropriate.
• Removed unused CancellationToken parameters (we will add them back when implemented).
• Builder classes now return interfaces, not concrete classes.
• Removed the dependency on CompilerServices.Unsafe which was causing ProduceAsync to hang in some scenarios.
• Fixed a deadlock-on-dispose issue in AdminClient.
• Made Producer.ProduceAsync async.
• Fixed deadlock in BeginProduce and Consume when using async serdes in a single threaded context.

v1.0-beta3

New Features

• Revamped producer and consumer serialization functionality.
  • There are now two types of serializer and deserializer: ISerializer<T> / IAsyncSerializer<T> and IDeserializer<T> / IAsyncDeserializer<T>.
    • ISerializer<T>/IDeserializer<T> are appropriate for most use cases.
    • IAsyncSerializer<T>/IAsyncDeserializer<T> are async friendly, but less performant (they return Tasks).
  • Changed the name of Confluent.Kafka.Avro to Confluent.SchemaRegistry.Serdes (Schema Registry may support other serialization formats in the future).
  • Added an example demonstrating working with protobuf serialized data.
• Consumers, Producers and AdminClients are now constructed using builder classes.
  • This is more verbose, but provides a sufficiently flexible and future proof API for specifying serdes and other configuration information.
  • All events on the client classes have been replaced with corresponding Set...Handler methods on the builder classes.
    • This allows (enforces) handlers are set on librdkafka initialization (which is important for some handlers, particularly the log handler).
    • events allow for more than one handler to be set, but this is often not appropriate (e.g. OnPartitionsAssigned), and never necessary. This is no longer possible.
    • events are also not async friendly (handlers can't return Task). The Set...Handler appropach can be extend in such a way that it is.
• Avro serdes no longer make blocking calls to ICachedSchemaRegistryClient - everything is awaited.
  • Note: The Consumer implementation still calls async deserializers synchronously because the Consumer API is still otherwise fully synchronous.
• Reference librdkafka.redist 1.0.0-RC7
  • Notable features: idempotent producer, sparse connections, KIP-62 (max.poll.interval.ms).
  • Note: End of partition notification is now disabled by default (enable using the EnablePartitionEof config property).
• Removed the Consumer.OnPartitionEOF event in favor notifying of partition eof via ConsumeResult.IsPartitionEOF.
• Removed ErrorEvent class and added IsFatal to Error class.
  • The IsFatal flag is now set appropriately for all errors (previously it was always set to false).
• Added PersistenceStatus property to DeliveryResult, which provides information on the persitence status of the message.

Fixes

• Added Close method to IConsumer interface.
• Changed the name of ProduceException.DeliveryReport to ProduceException.DeliveryResult.
• Fixed bug where enum config property couldn't be read after setting it.
• Added SchemaRegistryBasicAuthCredentialsSource back into SchemaRegistryConfig (#679).
• Fixed schema registry client failover connection issue (#737).
• Improvements to librdkafka dependnecy discovery (#743).

v1.0-beta2

New Features

• References librdkafka 1.0.0-PRE1. Highlights:
  • Idempotent producer.
  • Sparse connections (broker connections are only held open when in use).

Enhancements / Fixes

• Fixed a memory leak in ProduceAsync #640 (regression from 0.11.x).