c606237b1c
To ensure client code has explicit control over the reading of messages This change removes the ability to listen to multiple topics at once, as it is not feasible to build this functionality in at the library level while still giving client code total control and knowledge over which messages have been read / what the current offset is.
1.7 KiB
1.7 KiB
clj-kafka
Clojure library for Kafka.
Development is against the 0.8 release of Kafka. The protocols for 0.7 and 0.8 are incompatible so this will only work when connecting to a 0.8 cluster. Earlier releases of clj-kafka support the earlier 0.7 release if you need it.
Installing
Add the following to your Leiningen project.clj
:
[clj-kafka "0.1.2-0.8"]
Usage
Producer
Discovery of Kafka brokers from Zookeeper:
(brokers {"zookeeper.connect" "127.0.0.1:2181"})
;; ({:host "localhost", :jmx_port -1, :port 9999, :version 1})
(use 'clj-kafka.producer)
(def p (producer {"metadata.broker.list" "localhost:9999"
"serializer.class" "kafka.serializer.DefaultEncoder"
"partitioner.class" "kafka.producer.DefaultPartitioner"}))
(send-message p (message "test" (.getBytes "this is my message")))
Zookeeper Consumer
The Zookeeper consumer uses broker information contained within Zookeeper to consume messages. This consumer also allows the client to automatically commit consumed offsets so they're not retrieved again.
(use 'clj-kafka.consumer.zk)
(use 'clj-kafka.core)
(def config {"zookeeper.connect" "localhost:2182"
"group.id" "clj-kafka.consumer"
"auto.offset.reset" "smallest"
"auto.commit.enable" "false"})
(with-resource [c (consumer config)]
shutdown
(take 2 (messages c "test")))
License
Copyright © 2013 Paul Ingles
Distributed under the Eclipse Public License, the same as Clojure.