Version 1.20.0 (2018-12-10)

New Features:

• Add support for zstd compression (#1170).
• Add support for Idempotent Producer (#1152).
• Add support support for Kafka 2.1.0 (#1229).
• Add support support for OffsetCommit request/response pairs versions v1 to v5 (#1201).
• Add support support for OffsetFetch request/response pair up to version v5 (#1198).

Improvements:

• Export broker's Rack setting (#1173).
• Always use latest patch version of Go on CI (#1202).
• Add error codes 61 to 72 (#1195).

Bug Fixes:

• Fix build without cgo (#1182).
• Fix go vet suggestion in consumer group file (#1209).
• Fix typos in code and comments (#1228).

Version 1.19.0 (2018-09-27)

New Features:

• Implement a higher-level consumer group (#1099).

Improvements:

• Add support for Go 1.11 (#1176).

Bug Fixes:

• Fix encoding of MetadataResponse with version 2 and higher (#1174).
• Fix race condition in mock async producer (#1174).

Version 1.18.0 (2018-09-07)

New Features:

• Make Partitioner.RequiresConsistency vary per-message (#1112).
• Add customizable partitioner (#1118).
• Add ClusterAdmin support for CreateTopic, DeleteTopic, CreatePartitions, DeleteRecords, DescribeConfig, AlterConfig, CreateACL, ListAcls, DeleteACL (#1055).

Improvements:

• Add support for Kafka 2.0.0 (#1149).
• Allow setting LocalAddr when dialing an address to support multi-homed hosts (#1123).
• Simpler offset management (#1127).

Bug Fixes:

• Fix mutation of ProducerMessage.MetaData when producing to Kafka (#1110).
• Fix consumer block when response did not contain all the expected topic/partition blocks (#1086).
• Fix consumer block when response contains only constrol messages (#1115).
• Add timeout config for ClusterAdmin requests (#1142).
• Add version check when producing message with headers (#1117).
• Fix MetadataRequest for empty list of topics (#1132).
• Fix producer topic metadata on-demand fetch when topic error happens in metadata response (#1125).

Version 1.17.0 (2018-05-30)

New Features:

• Add support for gzip compression levels (#1044).
• Add support for Metadata request/response pairs versions v1 to v5 (#1047, #1069).
• Add versioning to JoinGroup request/response pairs (#1098).
• Add support for CreatePartitions, DeleteGroups, DeleteRecords request/response pairs (#1065, #1096, #1027).
• Add Controller() method to Client interface (#1063).

Improvements:

• ConsumerMetadataReq/Resp has been migrated to FindCoordinatorReq/Resp (#1010).
• Expose missing protocol parts: msgSet and recordBatch (#1049).
• Add support for v1 DeleteTopics Request (#1052).
• Add support for Go 1.10 (#1064).
• Claim support for Kafka 1.1.0 (#1073).

Bug Fixes:

• Fix FindCoordinatorResponse.encode to allow nil Coordinator (#1050, #1051).
• Clear all metadata when we have the latest topic info (#1033).
• Make PartitionConsumer.Close idempotent (#1092).

Version 1.16.0 (2018-02-12)

New Features:

• Add support for the Create/Delete Topics request/response pairs (#1007, #1008).
• Add support for the Describe/Create/Delete ACL request/response pairs (#1009).
• Add support for the five transaction-related request/response pairs (#1016).

Improvements:

• Permit setting version on mock producer responses (#999).
• Add NewMockBrokerListener helper for testing TLS connections (#1019).
• Changed the default value for Consumer.Fetch.Default from 32KiB to 1MiB which results in much higher throughput in most cases (#1024).
• Reuse the time.Ticker across fetch requests in the PartitionConsumer to reduce CPU and memory usage when processing many partitions (#1028).
• Assign relative offsets to messages in the producer to save the brokers a recompression pass (#1002, #1015).

Bug Fixes:

• Fix producing uncompressed batches with the new protocol format (#1032).
• Fix consuming compacted topics with the new protocol format (#1005).
• Fix consuming topics with a mix of protocol formats (#1021).
• Fix consuming when the broker includes multiple batches in a single response (#1022).
• Fix detection of PartialTrailingMessage when the partial message was truncated before the magic value indicating its version (#1030).
• Fix expectation-checking in the mock of SyncProducer.SendMessages (#1035).

Version 1.15.0 (2017-12-08)

New Features:

• Claim official support for Kafka 1.0, though it did already work (#984).
• Helper methods for Kafka version numbers to/from strings (#989).
• Implement CreatePartitions request/response (#985).

Improvements:

• Add error codes 45-60 (#986).

Bug Fixes:

• Fix slow consuming for certain Kafka 0.11/1.0 configurations (#982).
• Correctly determine when a FetchResponse contains the new message format (#990).
• Fix producing with multiple headers (#996).
• Fix handling of truncated record batches (#998).
• Fix leaking metrics when closing brokers (#991).

Version 1.14.0 (2017-11-13)

New Features:

• Add support for the new Kafka 0.11 record-batch format, including the wire protocol and the necessary behavioural changes in the producer and consumer. Transactions and idempotency are not yet supported, but producing and consuming should work with all the existing bells and whistles (batching, compression, etc) as well as the new custom headers. Thanks to Vlad Hanciuta of Arista Networks for this work. Part of (#901).

Bug Fixes:

• Fix encoding of ProduceResponse versions in test (#970).
• Return partial replicas list when we have it (#975).

Version 1.13.0 (2017-10-04)

New Features:

• Support for FetchRequest version 3 (#905).
• Permit setting version on mock FetchResponses (#939).
• Add a configuration option to support storing only minimal metadata for extremely large clusters (#937).
• Add PartitionOffsetManager.ResetOffset for backtracking tracked offsets (#932).

Improvements:

• Provide the block-level timestamp when consuming compressed messages (#885).
• Client.Replicas and Client.InSyncReplicas now respect the order returned by the broker, which can be meaningful (#930).
• Use a Ticker to reduce consumer timer overhead at the cost of higher variance in the actual timeout (#933).

Bug Fixes:

• Gracefully handle messages with negative timestamps (#907).
• Raise a proper error when encountering an unknown message version (#940).

Version 1.12.0 (2017-05-08)

New Features:

• Added support for the ApiVersions request and response pair, and Kafka version 0.10.2 (#867). Note that you still need to specify the Kafka version in the Sarama configuration for the time being.
• Added a Brokers method to the Client which returns the complete set of active brokers (#813).
• Added an InSyncReplicas method to the Client which returns the set of all in-sync broker IDs for the given partition, now that the Kafka versions for which this was misleading are no longer in our supported set (#872).
• Added a NewCustomHashPartitioner method which allows constructing a hash partitioner with a custom hash method in case the default (FNV-1a) is not suitable (#837, #841).

Improvements:

• Recognize more Kafka error codes (#859).

Bug Fixes:

• Fix an issue where decoding a malformed FetchRequest would not return the correct error (#818).
• Respect ordering of group protocols in JoinGroupRequests. This fix is transparent if you're using the AddGroupProtocol or AddGroupProtocolMetadata helpers; otherwise you will need to switch from the GroupProtocols field (now deprecated) to use OrderedGroupProtocols (#812).
• Fix an alignment-related issue with atomics on 32-bit architectures (#859).

Version 1.11.0 (2016-12-20)

New Features:

• Metrics! Thanks to Sébastien Launay for all his work on this feature
  (#701,
  #746,
  #766).
• Add support for LZ4 compression
  (#786).
• Add support for ListOffsetRequest v1 and Kafka 0.10.1
  (#775).
• Added a HighWaterMarks method to the Consumer which aggregates the
  HighWaterMarkOffset values of its child topic/partitions
  (#769).

Bug Fixes:

• Fixed producing when using timestamps, compression and Kafka 0.10
  (#759).
• Added missing decoder methods to DescribeGroups response
  (#756).
• Fix producer shutdown when Return.Errors is disabled
  (#787).
• Don't mutate configuration in SyncProducer
  (#790).
• Fix crash on SASL initialization failure
  (#795).