librdkafka - the Apache Kafka C/C++ client library

Copyright (c) 2012-2019, Magnus Edenhill.

https://github.com/edenhill/librdkafka

librdkafka is a C library implementation of the Apache Kafka protocol, providing Producer, Consumer and Admin clients. It was designed with message delivery reliability and high performance in mind, current figures exceed 1 million msgs/second for the producer and 3 million msgs/second for the consumer.

librdkafka is licensed under the 2-clause BSD license.

Features

• High-level producer
• High-level balanced KafkaConsumer (requires broker >= 0.9)
• Simple (legacy) consumer
• Admin client
• Compression: snappy, gzip, lz4, zstd
• SSL support
• SASL (GSSAPI/Kerberos/SSPI, PLAIN, SCRAM, OAUTHBEARER) support
• Full list of supported KIPs
• Broker version support: >=0.8 (see Broker version compatibility)
• Guaranteed API stability for C & C++ APIs (ABI safety guaranteed for C)
• Statistics metrics
• Debian package: librdkafka1 and librdkafka-dev in Debian and Ubuntu
• RPM package: librdkafka and librdkafka-devel
• Gentoo package: dev-libs/librdkafka
• Portable: runs on Linux, OSX, Win32, Solaris, FreeBSD, AIX, ...

Documentation

• Public API in C header and C++ header.
• Introduction and manual in INTRODUCTION.md.
• Configuration properties in CONFIGURATION.md.
• Statistics metrics in STATISTICS.md.
• Frequently asked questions.

NOTE: The master branch is actively developed, use latest release for production use.

Installation

Installing prebuilt packages

On Mac OSX, install librdkafka with homebrew:

$ brew install librdkafka

On Debian and Ubuntu, install librdkafka from the Confluent APT repositories, see instructions here and then install librdkafka:

$ apt install librdkafka-dev

On RedHat, CentOS, Fedora, install librdkafka from the Confluent YUM repositories, instructions here and then install librdkafka:

$ yum install librdkafka-devel

On Windows, reference librdkafka.redist NuGet package in your Visual Studio project.

For other platforms, follow the source building instructions below.

Build from source

Requirements

The GNU toolchain
GNU make
pthreads
zlib-dev (optional, for gzip compression support)
libssl-dev (optional, for SSL and SASL SCRAM support)
libsasl2-dev (optional, for SASL GSSAPI support)
libzstd-dev (optional, for ZStd compression support)

NOTE: Static linking of ZStd (requires zstd >= 1.2.1) in the producer enables encoding the original size in the compression frame header, which will speed up the consumer. Use STATIC_LIB_zstd=/path/to/libzstd.a ./configure --enable-static to enable static ZStd linking. MacOSX example: STATIC_LIB_zstd=$(brew ls -v zstd | grep libzstd.a$) ./configure --enable-static

Building

  ./configure
  # Or, to automatically install dependencies using the system's package manager:
  # ./configure --install-deps
  # Or, build dependencies from source:
  # ./configure --install-deps --source-deps-only

  make
  sudo make install

NOTE: See README.win32 for instructions how to build on Windows with Microsoft Visual Studio.

NOTE: See CMake instructions for experimental CMake build (unsupported).

Usage in code

1. Refer to the examples directory for code using:

• Producers: basic producers, idempotent producers
• Consumers: basic consumers, reading batches of messages
• Performance tester

2. Refer to the examples GitHub repo for code connecting to a cloud streaming data service based on Apache Kafka

3. Link your program with -lrdkafka (C) or -lrdkafka++ (C++).

Commercial support

Commercial support is available from Confluent Inc

Community support

Only the last official release is supported for community members.

File bug reports, feature requests and questions using GitHub Issues

Questions and discussions are also welcome on the Confluent Community slack #clients channel, or irc.freenode.org #apache-kafka channel.

Language bindings

• C#/.NET: confluent-kafka-dotnet (based on rdkafka-dotnet)
• C++: cppkafka
• Common Lisp: cl-rdkafka
• D (C-like): librdkafka
• D (C++-like): librdkafkad
• Erlang: erlkaf
• Go: confluent-kafka-go
• Haskell (kafka, conduit, avro, schema registry): hw-kafka
• Lua: luardkafka
• Node.js: node-rdkafka
• OCaml: ocaml-kafka
• PHP: phpkafka
• PHP: php-rdkafka
• Python: confluent-kafka-python
• Python: PyKafka
• Ruby: Hermann
• Ruby: rdkafka-ruby
• Rust: rust-rdkafka
• Tcl: KafkaTcl
• Swift: Perfect-Kafka

Users of librdkafka

• kafkacat - Apache Kafka swiss army knife
• Wikimedia's varnishkafka - Varnish cache web log producer
• Wikimedia's kafkatee - Kafka multi consumer with filtering and fanout
• rsyslog
• syslog-ng
• collectd
• logkafka - Collect logs and send to Kafka
• redBorder
• Headweb
• Produban's log2kafka - Web log producer
• fuse_kafka - FUSE file system layer
• node-kafkacat
• OVH - AntiDDOS
• otto.de's trackdrd - Varnish log reader
• Microwish has a range of Kafka utilites for log aggregation, HDFS integration, etc.
• aidp - kafka consumer embedded Lua scripting language in data process framework
• Yandex ClickHouse
• NXLog - Enterprise logging system, Kafka input/output plugin.
• large unnamed financial institutions
• and many more..
• Let me know if you are using librdkafka