├── .gitignore ├── .travis.yml ├── LICENSE ├── README.md ├── dev-resources └── log4j.properties ├── doc ├── clj-kafka.admin.html ├── clj-kafka.consumer.simple.html ├── clj-kafka.consumer.zk.html ├── clj-kafka.core.html ├── clj-kafka.new.producer.html ├── clj-kafka.producer.html ├── clj-kafka.zk.html ├── css │ └── default.css ├── index.html └── js │ ├── jquery.min.js │ └── page_effects.js ├── project.clj ├── src └── clj_kafka │ ├── admin.clj │ ├── consumer │ ├── simple.clj │ └── zk.clj │ ├── core.clj │ ├── new │ └── producer.clj │ ├── offset.clj │ ├── producer.clj │ └── zk.clj ├── test └── clj_kafka │ └── test │ ├── consumer │ ├── simple.clj │ └── zk.clj │ ├── offset.clj │ ├── producer.clj │ ├── utils.clj │ └── zk.clj └── update-docs.sh /.gitignore: -------------------------------------------------------------------------------- 1 | /pom.xml 2 | *jar 3 | /lib 4 | /classes 5 | /native 6 | /.lein-failures 7 | /checkouts 8 | /.lein-deps-sum 9 | autodoc/** 10 | /target 11 | .lein-repl-history 12 | /tmp 13 | /logs 14 | .nrepl-port 15 | .idea 16 | *.iml 17 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: clojure 2 | lein: lein2 3 | script: lein2 expectations 4 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Eclipse Public License - v 1.0 2 | 3 | THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC 4 | LICENSE ("AGREEMENT"). 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No party to this 201 | Agreement will bring a legal action under this Agreement more than one year 202 | after the cause of action arose. Each party waives its rights to a jury trial in 203 | any resulting litigation. 204 | 205 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # clj-kafka 2 | 3 | Clojure library for [Kafka](https://kafka.apache.org). 4 | 5 | Current build status: [![Build Status](https://travis-ci.org/pingles/clj-kafka.png)](https://travis-ci.org/pingles/clj-kafka) 6 | 7 | Development is against the 0.8 release of Kafka. 8 | 9 | ## Installing 10 | 11 | Add the following to your [Leiningen](http://github.com/technomancy/leiningen) `project.clj`: 12 | 13 | ![latest clj-kafka version](https://clojars.org/clj-kafka/latest-version.svg) 14 | 15 | ## Usage 16 | 17 | ### Producer 18 | 19 | Discovery of Kafka brokers from Zookeeper: 20 | 21 | ```clj 22 | (brokers {"zookeeper.connect" "127.0.0.1:2181"}) 23 | ;; ({:host "localhost", :jmx_port -1, :port 9999, :version 1}) 24 | ``` 25 | 26 | ```clj 27 | (use 'clj-kafka.producer) 28 | 29 | (def p (producer {"metadata.broker.list" "localhost:9999" 30 | "serializer.class" "kafka.serializer.DefaultEncoder" 31 | "partitioner.class" "kafka.producer.DefaultPartitioner"})) 32 | 33 | (send-message p (message "test" (.getBytes "this is my message"))) 34 | ``` 35 | 36 | See: [clj-kafka.producer](https://pingles.github.io/clj-kafka/clj-kafka.producer.html) 37 | 38 | 39 | ### New Producer 40 | 41 | As of 0.3.1 we also support the "new" pure-Java producer. The 42 | interface is superficially similar but we've chosen to keep names 43 | close to their Java equivalent. 44 | 45 | ```clj 46 | (use 'clj-kafka.new.producer) 47 | 48 | (with-open [p (producer {"bootstrap.servers" "127.0.0.1:9092"} (byte-array-serializer) (byte-array-serializer))] 49 | (send p (record "test-topic" (.getBytes "hello world!")))) 50 | ``` 51 | 52 | One key difference is that sending is asynchronous by default. `send` 53 | returns a `Future` immediately. If you want synchronous behaviour 54 | you can deref it right away: 55 | 56 | ```clj 57 | (with-open [p (producer {"bootstrap.servers" "127.0.0.1:9092"} (byte-array-serializer) (byte-array-serializer))] 58 | @(send p (record "test-topic" (.getBytes "hello world!")))) 59 | ``` 60 | 61 | See: [clj-kafka.new.producer](https://pingles.github.io/clj-kafka/clj-kafka.new.producer.html) 62 | 63 | 64 | ### Zookeeper Consumer 65 | 66 | The Zookeeper consumer uses broker information contained within 67 | Zookeeper to consume messages. This consumer also allows the client to 68 | automatically commit consumed offsets so they're not retrieved again. 69 | 70 | ```clj 71 | (use 'clj-kafka.consumer.zk) 72 | (use 'clj-kafka.core) 73 | 74 | (def config {"zookeeper.connect" "localhost:2182" 75 | "group.id" "clj-kafka.consumer" 76 | "auto.offset.reset" "smallest" 77 | "auto.commit.enable" "false"}) 78 | 79 | (with-resource [c (consumer config)] 80 | shutdown 81 | (take 2 (messages c "test"))) 82 | ``` 83 | 84 | The `messages` function provides the easy-case of single topic and single thread consumption. This 85 | is a stricter form of the same API that was in earlier releases. `messages` is built on two key 86 | other functions: `create-message-streams` and `stream-seq` that create the underlying streams and 87 | turn them into lazy sequences respectively; this change makes it easier to consume across multiple 88 | partitions and threads. 89 | 90 | See: [clj-kafka.consumer.zk](https://pingles.github.io/clj-kafka/clj-kafka.consumer.zk.html) 91 | 92 | #### Usage with transducers 93 | 94 | An alternate way of consuming is using `create-message-stream` or 95 | `create-message-streams` to obtain `KafkaStream` instances. These are 96 | `Iterable` which means, amongst other things, that they work nicely 97 | with transducers. 98 | 99 | Continuing previous example: 100 | 101 | ```clj 102 | ;; hypothetical transformation 103 | (def xform (comp (map deserialize-message) 104 | (filter production-traffic) 105 | (map parse-user-agent-string))) 106 | 107 | (with-resource [c (consumer config)] 108 | shutdown 109 | (let [stream (create-message-stream c "test-topic")] 110 | (run! write-to-database! (eduction xform stream)))) 111 | ``` 112 | 113 | 114 | ### Administration Operations 115 | 116 | There is support the following simple administration operations: 117 | 118 | - checking if a topic exists 119 | - creating a topic 120 | - deleting a topic (requires that the Kafka cluster supports deletion 121 | and has `delete.topic.enable` set to `true`) 122 | - retrieving topic configuration 123 | - changing topic configuration 124 | 125 | ```clj 126 | (require '[clj-kafka.admin :as admin]) 127 | 128 | (with-open [zk (admin/zk-client "127.0.0.1:2181")] 129 | (if-not (admin/topic-exists? zk "test-topic") 130 | (admin/create-topic zk "test-topic" 131 | {:partitions 3 132 | :replication-factor 1 133 | :config {"cleanup.policy" "compact"}}))) 134 | ``` 135 | 136 | See: [clj-kafka.admin](https://pingles.github.io/clj-kafka/clj-kafka.admin.html) 137 | 138 | 139 | ### Kafka Offset Manager Operations 140 | 141 | There is support the following simple Kafka offset management operations: 142 | 143 | - fetch the current offsets of a consumer group 144 | - reset the current offsets of a consumer group 145 | 146 | ```clj 147 | (require '[clj-kafka.offset :as offset]) 148 | 149 | (fetch-consumer-offsets "broker1:9092,broker1:9092" {"zookeeper.connect" "zkhost:2182"} "my-topic" "my-consumer") 150 | (reset-consumer-offsets "broker1:9092,broker1:9092" {"zookeeper.connect" "zkhost:2182"} "my-topic" "my-consumer" :earliest) 151 | (reset-consumer-offsets "broker1:9092,broker1:9092" {"zookeeper.connect" "zkhost:2182"} "my-topic" "my-consumer" :latest) 152 | ``` 153 | 154 | See: [clj-kafka.admin](https://pingles.github.io/clj-kafka/clj-kafka.offset.html) 155 | 156 | 157 | ## License 158 | 159 | Copyright © 2013 Paul Ingles 160 | 161 | Distributed under the Eclipse Public License, the same as Clojure. 162 | 163 | ## Thanks 164 | 165 | YourKit is kindly supporting this open source project with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. Take a look at YourKit's leading software products: 166 | [YourKit Java Profiler](http://www.yourkit.com/java/profiler/index.jsp) and 167 | [YourKit .NET Profiler](http://www.yourkit.com/.net/profiler/index.jsp). 168 | -------------------------------------------------------------------------------- /dev-resources/log4j.properties: -------------------------------------------------------------------------------- 1 | # Root logger option 2 | log4j.rootLogger=INFO, file 3 | 4 | log4j.appender.console=org.apache.log4j.ConsoleAppender 5 | log4j.appender.console.layout=org.apache.log4j.PatternLayout 6 | log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n 7 | 8 | log4j.appender.file=org.apache.log4j.FileAppender 9 | log4j.appender.file.File=./logs/kafka.log 10 | log4j.appender.file.layout=org.apache.log4j.PatternLayout 11 | log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n -------------------------------------------------------------------------------- /doc/clj-kafka.admin.html: -------------------------------------------------------------------------------- 1 | 2 | clj-kafka.admin documentation

clj-kafka.admin

Administration operations.

change-topic-config

(change-topic-config zk topic config)
view source

create-topic

(create-topic zk topic)(create-topic zk topic {:keys [partitions replication-factor config], :or {partitions 1, replication-factor 1, config nil}})
view source

delete-topic

(delete-topic zk topic)
view source

topic-config

(topic-config zk topic)
view source

topic-exists?

(topic-exists? zk topic)
view source

zk-client

(zk-client servers)(zk-client servers {:keys [session-timeout-ms connection-timeout-ms], :as opts, :or {session-timeout-ms 10000, connection-timeout-ms 10000}})

Create a ZkClient for use with the functions in this namespace. Servers is a Zookeeper connection string.

view source
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clj-kafka.consumer.simple

consumer

(consumer host port client-id & {:keys [timeout buffer-size], :or {timeout 100000, buffer-size 10000}})

Create a consumer to connect to host and port. Port will normally be 9092.

view source

fetch-request

(fetch-request client-id topic partition offset fetch-size)
view source

latest-topic-offset

(latest-topic-offset consumer topic partition)
view source

messages

(messages consumer client-id topic partition offset fetch-size)
view source

topic-meta-data

(topic-meta-data consumer topics)
view source

topic-offset

(topic-offset consumer topic partition offset-position)
view source
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clj-kafka.consumer.zk

consumer

(consumer m)

Uses information in Zookeeper to connect to Kafka. More info on settings is available here: https://kafka.apache.org/08/configuration.html

Recommended for using with with-resource: (with-resource [c (consumer m)] shutdown (take 5 (messages c “test”)))

Keys: zookeeper.connect : host:port for Zookeeper. e.g: 127.0.0.1:2181 group.id : consumer group. e.g. group1 auto.offset.reset : what to do if an offset is out of range, e.g. smallest, largest auto.commit.interval.ms : the frequency that the consumed offsets are committed to zookeeper. auto.commit.enable : if set to true, the consumer periodically commits to zookeeper the latest consumed offset of each partition

view source

create-message-stream

(create-message-stream consumer topic)(create-message-stream consumer topic key-decoder value-decoder)

Creates a single message stream for given topic.

view source

create-message-streams

(create-message-streams consumer topic-count-map)(create-message-streams consumer topic-count-map key-decoder value-decoder)

Creates multiple message streams for consuming multiple topics, or a single topic cusing multiple threads. topic-count-map is a map from a topic name to the number of streams desired for that topic.

view source

default-decoder

(default-decoder)

Creates the default decoder that reads message keys and values as byte arrays.

view source

messages

(messages consumer topic & {:keys [key-decoder value-decoder], :or {key-decoder (default-decoder), value-decoder (default-decoder)}})

Provides an easy way to consume a sequence of KafkaMessage messages from the named topic. Consumes on a single thread and returns a lazy sequence.

view source

shutdown

(shutdown consumer)

Closes the connection to Zookeeper and stops consuming messages.

view source

stream-seq

(stream-seq stream)

Returns a lazy sequence of KafkaMessage messages from the stream.

view source
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clj-kafka.core

->KafkaMessage

(->KafkaMessage topic offset partition key value)

Positional factory function for class clj_kafka.core.KafkaMessage.

view source

as-properties

(as-properties m)
view source

map->KafkaMessage

(map->KafkaMessage m__5818__auto__)

Factory function for class clj_kafka.core.KafkaMessage, taking a map of keywords to field values.

view source

ToClojure

protocol

members

to-clojure

(to-clojure x)

Converts type to Clojure structure

view source

with-resource

macro

(with-resource binding close-fn & body)
view source
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clj-kafka.new.producer

Clojure interface to the “new” Kafka Producer API. For complete JavaDocs, see: http://kafka.apache.org/082/javadoc/org/apache/kafka/clients/producer/package-summary.html

byte-array-serializer

(byte-array-serializer)
view source

producer

(producer config)(producer config key-serializer value-serializer)

Return a KafkaProducer for publishing records to Kafka. KafkaProducer instances are thread-safe and should generally be shared for best performance.

Implements Closeable, so suitable for use with with-open.

For available config options, see: http://kafka.apache.org/documentation.html#newproducerconfigs

view source

record

(record topic value)(record topic key value)(record topic partition key value)

Return a record that can be published to Kafka using send.

view source

send

(send producer record)(send producer record callback)

Asynchronously send a record to Kafka. Returns a Future of a map with :topic, :partition and :offset keys. Optionally provide a callback fn that will be called when the operation completes. Callback should be a fn of two arguments, a map as above, and an exception. Exception will be nil if operation succeeded.

For details on behaviour, see http://kafka.apache.org/082/javadoc/org/apache/kafka/clients/producer/KafkaProducer.html#send(org.apache.kafka.clients.producer.ProducerRecord,org.apache.kafka.clients.producer.Callback)

view source

string-serializer

(string-serializer)
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clj-kafka.producer

message

(message topic value)(message topic key value)
view source

producer

(producer m)

Creates a Producer. m is the configuration metadata.broker.list : “server:port,server:port”

view source

send-message

(send-message producer message)
view source

send-messages

(send-messages producer messages)
view source
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clj-kafka.zk

broker-list

(broker-list brokers)

Returns a comma separated list of Kafka brokers, as returned from clj-kafka.zk/brokers. e.g.: (broker-list (brokers {“zookeeper.connect” “127.0.0.1:2181”}))

view source

brokers

(brokers m)

Get brokers from zookeeper

view source

committed-offset

(committed-offset m consumer-group topic partition)
view source

controller

(controller m)

Get leader node

view source

offset-path

(offset-path consumer-group topic partition)
view source

partitions

(partitions m topic)

Returns a map of partitions and replica ids. e.g. {“1” [0], “0” [0]}

view source

set-offset!

(set-offset! m consumer-group topic partition offset)
view source

topics

(topics m)

Get topics

view source
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Clj-kafka 0.3.1

Clojure wrapper for Kafka's Java API

clj-kafka.admin

Administration operations.

Public variables and functions:

clj-kafka.consumer.simple

Public variables and functions:

clj-kafka.consumer.zk

Public variables and functions:

clj-kafka.core

Public variables and functions:

clj-kafka.new.producer

Clojure interface to the “new” Kafka Producer API. For complete JavaDocs, see: http://kafka.apache.org/082/javadoc/org/apache/kafka/clients/producer/package-summary.html

Public variables and functions:

clj-kafka.producer

Public variables and functions:

clj-kafka.zk

Public variables and functions:

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