├── .gitignore ├── LICENSE ├── README.md ├── doc └── intro.md ├── project.clj ├── resources └── log4j.properties ├── src └── kafka_streams │ ├── core.clj │ └── dictionary_words.clj └── test └── kafka_streams └── core_test.clj /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | /classes 3 | /checkouts 4 | pom.xml 5 | pom.xml.asc 6 | *.jar 7 | *.class 8 | /.lein-* 9 | /.nrepl-port 10 | .hgignore 11 | .hg/ 12 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC 2 | LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM 3 | CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT. 4 | 5 | 1. 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Each party waives its rights to a jury trial 214 | in any resulting litigation. 215 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # kafka-streams 2 | 3 | ## Quickstart 4 | 5 | ### Download confluent 6 | ``` 7 | wget http://packages.confluent.io/archive/3.0/confluent-3.0.0-2.11.zip 8 | unzip confluent-3.0.0-2.11.zip 9 | 10 | cd confluent-3.0.0/ 11 | ``` 12 | 13 | ### Start zookeeper and kafka 14 | ``` 15 | ./bin/zookeeper-server-start ./etc/kafka/zookeeper.properties 16 | ./bin/kafka-server-start ./etc/kafka/server.properties 17 | ``` 18 | 19 | ### Create input and output topics 20 | ``` 21 | ./bin/kafka-topics --create \ 22 | --zookeeper localhost:2181 \ 23 | --replication-factor 1 \ 24 | --partitions 1 \ 25 | --topic my-input-topic 26 | 27 | ./bin/kafka-topics --create \ 28 | --zookeeper localhost:2181 \ 29 | --replication-factor 1 \ 30 | --partitions 1 \ 31 | --topic my-output-topic 32 | ``` 33 | 34 | ### Compile and run the application 35 | ``` 36 | lein uberjar 37 | java -jar target/kafka_streams.jar 38 | ``` 39 | 40 | ### Produce some data 41 | ``` 42 | ./bin/kafka-console-producer \ 43 | --broker-list localhost:9092 \ 44 | --topic my-input-topic 45 | ``` 46 | 47 | ### See the output 48 | ``` 49 | ./bin/kafka-console-consumer \ 50 | --zookeeper localhost:2181 \ 51 | --topic my-output-topic \ 52 | --from-beginning \ 53 | --formatter kafka.tools.DefaultMessageFormatter \ 54 | --property print.key=true \ 55 | --property key.deserializer=org.apache.kafka.common.serialization.StringDeserializer \ 56 | --property value.deserializer=org.apache.kafka.common.serialization.StringDeserializer 57 | ``` 58 | 59 | ## License 60 | 61 | Copyright © 2016 FIXME 62 | 63 | Distributed under the Eclipse Public License either version 1.0 or (at 64 | your option) any later version. 65 | -------------------------------------------------------------------------------- /doc/intro.md: -------------------------------------------------------------------------------- 1 | # Introduction to kafka-streams 2 | 3 | TODO: write [great documentation](http://jacobian.org/writing/what-to-write/) 4 | -------------------------------------------------------------------------------- /project.clj: -------------------------------------------------------------------------------- 1 | (defproject kafka-streams "0.1.0-SNAPSHOT" 2 | :description "FIXME: write description" 3 | :url "http://example.com/FIXME" 4 | :license {:name "Eclipse Public License" 5 | :url "http://www.eclipse.org/legal/epl-v10.html"} 6 | 7 | :main kafka-streams.core 8 | 9 | :uberjar-name "kafka_streams.jar" 10 | 11 | :repositories {"confluent" {:url "http://packages.confluent.io/maven/"}} 12 | 13 | :dependencies [[org.apache.kafka/kafka-streams "0.10.0.0-cp1"] 14 | [org.clojure/clojure "1.7.0"]]) 15 | -------------------------------------------------------------------------------- /resources/log4j.properties: -------------------------------------------------------------------------------- 1 | log4j.rootLogger=debug, stdout 2 | log4j.appender.stdout=org.apache.log4j.ConsoleAppender 3 | log4j.appender.stdout.Target=System.out 4 | log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 5 | log4j.appender.stdout.layout.ConversionPattern=%t %-5p %c{2} - %m%n 6 | -------------------------------------------------------------------------------- /src/kafka_streams/core.clj: -------------------------------------------------------------------------------- 1 | (ns kafka-streams.core 2 | (:import [org.apache.kafka.streams.kstream KStreamBuilder ValueMapper] 3 | [org.apache.kafka.streams KafkaStreams StreamsConfig] 4 | [org.apache.kafka.common.serialization Serdes]) 5 | (:gen-class)) 6 | 7 | (def props 8 | {StreamsConfig/APPLICATION_ID_CONFIG, "my-stream-processing-application" 9 | StreamsConfig/BOOTSTRAP_SERVERS_CONFIG, "localhost:9092" 10 | StreamsConfig/KEY_SERDE_CLASS_CONFIG, (.getName (.getClass (Serdes/String))) 11 | StreamsConfig/VALUE_SERDE_CLASS_CONFIG, (.getName (.getClass (Serdes/String)))}) 12 | 13 | (def config 14 | (StreamsConfig. props)) 15 | 16 | (def builder 17 | (KStreamBuilder.)) 18 | 19 | (def input-topic 20 | (into-array String ["my-input-topic"])) 21 | 22 | (-> 23 | (.stream builder input-topic) 24 | (.mapValues (reify ValueMapper (apply [_ v] ((comp str count) v)))) 25 | (.to "my-output-topic")) 26 | 27 | (def streams 28 | (KafkaStreams. builder config)) 29 | 30 | (defn -main [& args] 31 | (prn "starting") 32 | (.start streams) 33 | (Thread/sleep (* 60000 10)) 34 | (prn "stopping")) -------------------------------------------------------------------------------- /src/kafka_streams/dictionary_words.clj: -------------------------------------------------------------------------------- 1 | (ns kafka-streams.dictionary-words 2 | (:import [org.apache.kafka.streams.kstream KStreamBuilder KGroupedTable KeyValueMapper ValueMapper] 3 | [org.apache.kafka.streams KafkaStreams StreamsConfig KeyValue] 4 | [org.apache.kafka.common.serialization Serdes]) 5 | (:gen-class)) 6 | 7 | (def props 8 | {StreamsConfig/APPLICATION_ID_CONFIG "dictionary-words-count" 9 | StreamsConfig/BOOTSTRAP_SERVERS_CONFIG "localhost:9092" 10 | StreamsConfig/KEY_SERDE_CLASS_CONFIG (.getName (.getClass (Serdes/String))) 11 | StreamsConfig/VALUE_SERDE_CLASS_CONFIG (.getName (.getClass (Serdes/String)))}) 12 | 13 | ; props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest"); 14 | 15 | (def config 16 | (StreamsConfig. props)) 17 | 18 | (def builder 19 | (KStreamBuilder.)) 20 | 21 | (def input-topics 22 | (into-array String ["dictionary-words-stream"])) 23 | 24 | (def input 25 | (.stream builder (Serdes/String) (Serdes/String) input-topics)) 26 | 27 | (def word-counts 28 | (-> 29 | input 30 | (.flatMapValues (reify ValueMapper (apply [_ value] (prn "value:::" value) [value]))) 31 | (.map (reify KeyValueMapper (apply [_ key word] (prn "key:::" key "value:::" word) 32 | (prn "KeyValue" (KeyValue. word word)) 33 | (KeyValue. word word)))) 34 | (.countByKey "Counts"))) 35 | 36 | (def job 37 | (KafkaStreams. builder config)) 38 | 39 | (defn -main [& args] 40 | (prn "starting...") 41 | (.start job)) 42 | 43 | ;./bin/kafka-console-consumer \ 44 | ;--zookeeper localhost:2181 \ 45 | ;--topic dictionary-words-count-dictionary-words-count-changelog \ 46 | ;--from-beginning \ 47 | ;--formatter kafka.tools.DefaultMessageFormatter \ 48 | ;--property print.key=true \ 49 | ;--property key.deserializer=org.apache.kafka.common.serialization.StringDeserializer \ 50 | ;--property value.deserializer=org.apache.kafka.common.serialization.LongDeserializer 51 | 52 | ;./bin/kafka-console-consumer --zookeeper localhost:2181 --topic dictionary-words-count-dictionary-words-count-changelog --from-beginning --formatter kafka.tools.DefaultMessageFormatter --property print.key=true --property key.deserializer=org.apache.kafka.common.serialization.StringDeserializer --property value.deserializer=org.apache.kafka.common.serialization.LongDeserializer -------------------------------------------------------------------------------- /test/kafka_streams/core_test.clj: -------------------------------------------------------------------------------- 1 | (ns kafka-streams.core-test 2 | (:require [clojure.test :refer :all] 3 | [kafka-streams.core :refer :all])) 4 | 5 | (deftest a-test 6 | (testing "FIXME, I fail." 7 | (is (= 0 1)))) 8 | --------------------------------------------------------------------------------