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Confluent's Golang client for Apache Kafka

v2.3.0

This is a maintenance release.

Fixes

  • Fixes a bug in the mock schema registry client where the wrong ID was being returned for pre-registered schema (#971, @srlk).

v2.2.0

This is a feature release.

  • KIP-339 IncrementalAlterConfigs API (#945).
  • KIP-554: User SASL/SCRAM credentials alteration and description (#1004).

Fixes

  • Fixes a nil pointer bug in the protobuf Serializer.Serialize(), caused due to an unchecked error (#997, @baganokodo2022).
  • Fixes incorrect protofbuf FileDescriptor references (#989, @Mrmann87).
  • Allow fetching all partition offsets for a consumer group by passing a nil slice in AdminClient.ListConsumerGroupOffsets, when earlier it was not processing that correctly (#985, @alexandredantas).
  • Deprecate m.LeaderEpoch in favor of m.TopicPartition.LeaderEpoch (#1012).

confluent-kafka-go is based on librdkafka v2.2.0, see the librdkafka v2.2.0 release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

v2.1.1

This is a maintenance release.

It is strongly recommended to update to v2.1.1 if v2.1.0 is being used, as it fixes a critical issue in the consumer (#980).

confluent-kafka-go is based on librdkafka v2.1.1, see the librdkafka v2.1.1 release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

v2.1.0

This is a feature release:

  • Added Consumer SeekPartitions() method to seek multiple partitions at once and deprecated Seek() (#940).
  • KIP-320: add offset leader epoch to the TopicPartition
    and Message structs (#968).
  • The minimum version of Go supported has been changed from 1.14 to 1.16 (#973).
  • Add validation on the Producer, the Consumer and the AdminClient to prevent panic when they are used after close (#901).
  • Fix bug causing schema-registry URL with existing path to not be parsed correctly (#950).
  • Support for Offset types on Offset.Set() (#962, @jdockerty).
  • Added example for using rebalance callback with manual commit.

confluent-kafka-go is based on librdkafka v2.1.0, see the librdkafka v2.1.0 release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

v2.0.2

This is a feature release:

  • Added SetSaslCredentials. This new method (on the Producer, Consumer, and AdminClient) allows modifying the stored SASL PLAIN/SCRAM credentials that will be used for subsequent (new) connections to a broker.
  • Channel based producer (Producer ProduceChannel()) and channel based consumer (Consumer Events()) are deprecated.
  • Added IsTimeout() on Error type. This is a convenience method that checks if the error is due to a timeout.
  • The timeout parameter on Seek() is now ignored and an infinite timeout is used, the method will block until the fetcher state is updated (typically within microseconds).
  • The minimum version of Go supported has been changed from 1.11 to 1.14.
  • KIP-222 Add Consumer Group operations to Admin API.
  • KIP-518 Allow listing consumer groups per state.
  • KIP-396 Partially implemented: support for AlterConsumerGroupOffsets.
  • As result of the above KIPs, added (#923)
    • ListConsumerGroups Admin operation. Supports listing by state.
    • DescribeConsumerGroups Admin operation. Supports multiple groups.
    • DeleteConsumerGroups Admin operation. Supports multiple groups (@vsantwana).
    • ListConsumerGroupOffsets Admin operation. Currently, only supports 1 group with multiple partitions. Supports the requireStable option.
    • AlterConsumerGroupOffsets Admin operation. Currently, only supports 1 group with multiple offsets.
  • Added SetRoundtripDuration to the mock broker for setting RTT delay for a given mock broker (@kkoehler, #892).
  • Built-in support for Linux/ arm64. (#933).

Fixes

  • The SpecificDeserializer.Deserialize method was not returning its result result correctly, and was hence unusable. The return has been fixed (#849).
  • The schema ID to use during serialization, specified in SerializerConfig, was ignored. It is now used as expected (@perdue, #870).
  • Creating a new schema registry client with an SSL CA Certificate led to a panic. This was due to a nil pointer, fixed with proper initialization (@HansK-p, @ju-popov, #878).

Upgrade considerations

  • OpenSSL 3.0.x upgrade in librdkafka requires a major version bump, as some legacy ciphers need to be explicitly configured to continue working, but it is highly recommended not to use them. The rest of the API remains backward compatible, see the librdkafka release notes below for details.
  • As required by the Go module system, a suffix with the new major version has been added to the module name, and package imports must reflect this change.

confluent-kafka-go is based on librdkafka v2.0.2, see the librdkafka v2.0.0 release notes and later ones for a complete list of changes, enhancements, fixes and upgrade considerations.

Note: There were no confluent-kafka-go v2.0.0 or v2.0.1 releases.

v1.9.2

This is a maintenance release:

  • Bundles librdkafka v1.9.2.
  • Example for using go clients with AWS lambda (@jliunyu, #823).
  • OAUTHBEARER unsecured producer, consumer and OIDC examples.

confluent-kafka-go is based on librdkafka v1.9.2, see the librdkafka release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

v1.9.1

This is a feature release:

confluent-kafka-go is based on librdkafka v1.9.1, see the librdkafka release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

v1.9.0

This is a feature release:

  • OAUTHBEARER OIDC support
  • KIP-140 Admin API ACL support
  • Added MockCluster for functional testing of applications without the need for a real Kafka cluster (by @SourceFellows and @kkoehler, #729). See examples/mock_cluster.

Fixes

  • Fix Rebalance events behavior for static membership (@jliunyu, #757, #798).
  • Fix consumer close taking 10 seconds when there's no rebalance needed (@jliunyu, #757).

confluent-kafka-go is based on librdkafka v1.9.0, see the librdkafka release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

v1.8.2

This is a maintenance release:

  • Bundles librdkafka v1.8.2
  • Check termination channel while reading delivery reports (by @zjj)
  • Added convenience method Consumer.StoreMessage() (@finncolman, #676)

confluent-kafka-go is based on librdkafka v1.8.2, see the librdkafka release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

Note: There were no confluent-kafka-go v1.8.0 and v1.8.1 releases.

v1.7.0

Enhancements

  • Experimental Windows support (by @neptoess).
  • The produced message headers are now available in the delivery report Message.Headers if the Producer's go.delivery.report.fields configuration property is set to include headers, e.g.: "go.delivery.report.fields": "key,value,headers" This comes at a performance cost and are thus disabled by default.

Fixes

  • AdminClient.CreateTopics() previously did not accept default value(-1) of ReplicationFactor without specifying an explicit ReplicaAssignment, this is now fixed.

confluent-kafka-go is based on librdkafka v1.7.0, see the librdkafka release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

v1.6.1

v1.6.1 is a feature release:

  • KIP-429: Incremental consumer rebalancing - see cooperative_consumer_example.go for an example how to use the new incremental rebalancing consumer.
  • KIP-480: Sticky producer partitioner - increase throughput and decrease latency by sticking to a single random partition for some time.
  • KIP-447: Scalable transactional producer - a single transaction producer can now be used for multiple input partitions.

confluent-kafka-go is based on and bundles librdkafka v1.6.1, see the librdkafka release notes for a complete list of changes, enhancements, fixes and upgrade considerations.

Enhancements

  • go.delivery.report.fields=all,key,value,none can now be used to avoid copying message key and/or value to the delivery report, improving performance in high-throughput applications (by @kevinconaway).

Fixes

  • Consumer.Close() previously did not trigger the final RevokePartitions callback, this is now fixed.

v1.5.2

v1.5.2 is a maintenance release with the following fixes and enhancements:

  • Bundles librdkafka v1.5.2 - see release notes for all enhancements and fixes.
  • Documentation fixes

confluent-kafka-go is based on librdkafka v1.5.2, see the librdkafka release notes for a complete list of changes, enhancements, fixes and upgrade considerations.