{"id":46711,"date":"2023-02-27T23:36:33","date_gmt":"2023-02-04T16:25:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/46711-2\/"},"modified":"2024-04-29T16:37:40","modified_gmt":"2024-04-29T08:37:40","slug":"46711-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/46711-2\/","title":{"rendered":""},"content":{"rendered":"

\u3053\u306e\u8a18\u4e8b\u306f Kafka Advent Calendar 2021 \u306e11\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n

\u524d\u56de\u306e\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f Kafka Streams \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092Clojure\u3067\u66f8\u3044\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n

Jackdaw\u3068\u3044\u3046 Kafka Streams \u306e Clojure \u30e9\u30c3\u30d1\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u30c6\u30b9\u30c8\u74b0\u5883\u69cb\u7bc9<\/h2>\n

\u624b\u8efd\u306b\u624b\u5143\u3067\u8a66\u3057\u305f\u3044\u306e\u3067\u3001Kafka \u306e Quick start \u306b\u5f93\u3044\u74b0\u5883\u69cb\u7bc9\u3057\u307e\u3059\u3002<\/p>\n

$ <\/span>tar<\/span> -xzf<\/span> kafka_2.13-3.0.0.tgz\r\n$ <\/span>cd <\/span>kafka_2.13-3.0.0\r\n<\/code><\/pre>\n
ZooKeeper \u3068 Kafka broker \u3092\u305d\u308c\u305e\u308c\u5225\u306e\u30bf\u30fc\u30df\u30ca\u30eb\u304b\u3089\u8d77\u52d5\u3057\u307e\u3059\u3002<\/p>\n
# Start the ZooKeeper service<\/span>\r\n# Note: Soon, ZooKeeper will no longer be required by Apache Kafka.<\/span>\r\nbin\/zookeeper-server-start.sh config\/zookeeper.properties\r\n<\/code><\/pre>\n
# Start the Kafka broker service<\/span>\r\nbin\/kafka-server-start.sh config\/server.properties\r\n<\/code><\/pre>\n
\u5fc5\u8981\u306a\u30c8\u30d4\u30c3\u30af\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
bin\/kafka-topics.sh --create<\/span> --bootstrap-server<\/span> localhost:9092 --partitions<\/span> 2 --replication-factor<\/span> 1 --topic<\/span> event\r\nbin\/kafka-topics.sh --create<\/span> --bootstrap-server<\/span> localhost:9092 --partitions<\/span> 2 --replication-factor<\/span> 1 --topic<\/span> entity\r\n<\/code><\/pre>\n
\u52d5\u4f5c\u78ba\u8a8d<\/h2>\n
kafka-streams-demo \u3092\u30af\u30ed\u30fc\u30f3\u3057\u3066\u4e0b\u3055\u3044\u3002<\/p>\n
git clone https:\/\/github.com\/223kazuki\/kafka-streams-demo\r\ncd <\/span>kafka-streams-demo\r\n<\/code><\/pre>\n
dev \u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3067nrepl\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3059\u308b\u3088\u3046\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u597d\u304d\u306a\u958b\u767a\u74b0\u5883\u304b\u3089\u63a5\u7d9a\u3057\u3066\u4e0b\u3055\u3044\u3002\u666e\u901a\u306b repl \u3092\u8d77\u52d5\u3057\u3066\u3082\u53ef\u3002<\/p>\n
clj -A<\/span>:dev\r\n<\/code><\/pre>\n
kafka_streams_demo.clj \u306e\u4e0b\u90e8\u306b\u30c6\u30b9\u30c8\u7528\u306e\u30b3\u30fc\u30c9\u304c\u3042\u308b\u306e\u3067 comment \u5185\u3067 eval \u3057\u3066\u4e0b\u3055\u3044\u3002\u4e0b\u8a18\u3067 Kafka Streams \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8d77\u52d5\u3057\u307e\u3059\u3002<\/p>\n
(<\/span>def<\/span> app<\/span> (<\/span>start-app<\/span> (<\/span>app-config<\/span>)))<\/span>\r\n(<\/span>stop-app<\/span> app<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u8d77\u52d5\u5f8c\u3001\u4e0b\u8a18\u3067\u30c8\u30d4\u30c3\u30af\u306b\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/p>\n
(<\/span>def<\/span> p<\/span> (<\/span>jc\/producer<\/span> {<\/span>:bootstrap.servers<\/span> \"localhost:9092\"<\/span>}<\/span>\r\n                    {<\/span>:key-serde<\/span> (<\/span>jse\/serde<\/span>)<\/span>\r\n                     :value-serde<\/span> (<\/span>jse\/serde<\/span>)}))<\/span>\r\n@<\/span>(<\/span>jc\/produce!<\/span> p<\/span> {<\/span>:topic-name<\/span> \"event\"<\/span>}<\/span> :id-1<\/span> {<\/span>:type<\/span> :update-entity<\/span>\r\n                                             :data<\/span> {<\/span>:inc<\/span> 1<\/span>}})<\/span>\r\n@<\/span>(<\/span>jc\/produce!<\/span> p<\/span> {<\/span>:topic-name<\/span> \"event\"<\/span>}<\/span> :id-1<\/span> {<\/span>:type<\/span> :update-entity<\/span>\r\n                                             :data<\/span> {<\/span>:inc<\/span> 10<\/span>}})<\/span>\r\n<\/code><\/pre>\n
kafka-streams-demo \u306e\u30ed\u30b0\u3088\u308a\u3001Input event \u3068 Updated entity \u304c\u78ba\u8a8d\u51fa\u6765\u308b\u306e\u3067\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u671f\u5f85\u901a\u308a\u306b\u66f4\u65b0\u3055\u308c\u3066\u3044\u304f\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u4e0b\u3055\u3044\u3002\u30c8\u30dd\u30ed\u30b8\u30fc\u5185\u3067\u610f\u56f3\u7684\u306b (Thread\/sleep 3000) \u3057\u3066\u304a\u308a\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9023\u7d9a\u3067\u751f\u6210\u3057\u305f\u5834\u5408\u3001\u524d\u56de\u306e\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f\u7af6\u5408\u72b6\u614b\u3092\u5f15\u304d\u8d77\u3053\u3057\u3048\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u540c\u69d8\u306b\u8aac\u660e\u3057\u305f\u901a\u308a StateStore \u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u5b9f\u969b\u306b\u306f\u7af6\u5408\u72b6\u614b\u3092\u9632\u3052\u3066\u3044\u307e\u3059\u3002<\/p>\n
INFO  kafka-streams-demo - Input: {:key :id-1, :value {:type :update-entity, :data {:inc 1}, :entity nil}}\r\nINFO  kafka-streams-demo - Updated entity: {:count 1}\r\nINFO  kafka-streams-demo - Input: {:key :id-1, :value {:type :update-entity, :data {:inc 10}, :entity {:count 1}}}\r\nINFO  kafka-streams-demo - Updated entity: {:count 11}\r\n<\/code><\/pre>\n
\u30c8\u30dd\u30ed\u30b8\u30fc<\/h2>\n
Jackdaw \u306b\u3088\u308a\u3001Streams DSL \u304c clojure \u95a2\u6570\u306b\u30e9\u30c3\u30d7\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u308c\u3089\u306f builder \u304b kstreams \u3092\u7b2c\u4e00\u5f15\u6570\u306b\u53d6\u308b\u305f\u3081\u3001\u30b9\u30ec\u30c3\u30c7\u30a3\u30f3\u30b0\u30de\u30af\u30ed\u3067\u7c21\u6f54\u306b\u306b\u30c8\u30dd\u30ed\u30b8\u30fc\u3092\u66f8\u304d\u4e0b\u305b\u307e\u3059\u3002\u307e\u305f\u3001\u5909\u63db\u81ea\u4f53\u3082\u7c21\u5358\u306a\u3082\u306e\u3067\u3042\u308c\u3070\u7121\u540d\u95a2\u6570\u3067\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u898b\u901a\u3057\u304c\u3088\u304f\u306a\u308a\u307e\u3059\u3002\u30c8\u30dd\u30ed\u30b8\u30fc\u306e\u5206\u5c90\u3082\u30de\u30af\u30ed\u3092\u3046\u307e\u304f\u5229\u7528\u3059\u308c\u3070\u3042\u308b\u7a0b\u5ea6\u53ef\u8aad\u6027\u3092\u4fdd\u3066\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
(<\/span>defn<\/span> build-topology<\/span>\r\n  [<\/span>builder<\/span>]<\/span>\r\n  (<\/span>let<\/span> [<\/span>event-topic<\/span> (<\/span>topic-config<\/span> \"event\"<\/span>)<\/span>\r\n        entity-topic<\/span> (<\/span>topic-config<\/span> \"entity\"<\/span>)<\/span>\r\n        store-name<\/span> \"entity-store\"<\/span>]<\/span>\r\n    (<\/span>-><\/span> builder<\/span>\r\n        ;; Add state store to the application<\/span>\r\n        (<\/span>j\/with-kv-state-store<\/span> {<\/span>:store-name<\/span> store-name<\/span>})<\/span>\r\n\r\n        ;; Start streams<\/span>\r\n        (<\/span>j\/kstream<\/span> event-topic<\/span>)<\/span>\r\n\r\n        ;; Filter by message type<\/span>\r\n        (<\/span>j\/filter<\/span> (<\/span>fn<\/span> [[<\/span>_<\/span> {<\/span>:keys<\/span> [<\/span>type<\/span>]}]]<\/span>\r\n                    (<\/span>=<\/span> :update-entity<\/span> type<\/span>)))<\/span>\r\n\r\n        ;; Left join entity from ktable then state store<\/span>\r\n        ;; Event -> Event + Entity<\/span>\r\n        (<\/span>j\/left-join<\/span> (<\/span>j\/ktable<\/span> builder<\/span> entity-topic<\/span>)<\/span> #<\/span>(<\/span>assoc<\/span> %1<\/span> :entity<\/span> %2<\/span>))<\/span>\r\n        (<\/span>j\/transform<\/span> (<\/span>lambdas\/transformer-with-ctx<\/span>\r\n                      (<\/span>fn<\/span> [<\/span>ctx<\/span> k<\/span> v<\/span>]<\/span>\r\n                        (<\/span>let<\/span> [<\/span>store<\/span> (<\/span>.getStateStore<\/span> ctx<\/span> store-name<\/span>)<\/span>\r\n                              stored-entity<\/span> (<\/span>.get<\/span> store<\/span> k<\/span>)]<\/span>\r\n                          (<\/span>key-value<\/span> [<\/span>k<\/span> (<\/span>update<\/span> v<\/span> :entity<\/span> #<\/span>(<\/span>or<\/span> stored-entity<\/span> %<\/span>))]))))<\/span>\r\n                     [<\/span>store-name<\/span>])<\/span>\r\n\r\n        ;; Process input message and existing entity to updated entity<\/span>\r\n        ;; Event + Entity -> Entity'<\/span>\r\n        (<\/span>j\/peek<\/span> (<\/span>fn<\/span> [[<\/span>k<\/span> v<\/span>]]<\/span>\r\n                  (<\/span>log\/info<\/span> \"Input:\"<\/span> {<\/span>:key<\/span> k<\/span> :value<\/span> v<\/span>})))<\/span>\r\n        (<\/span>j\/map-values<\/span> (<\/span>fn<\/span> [{<\/span>:keys<\/span> [<\/span>data<\/span> entity<\/span>]}]<\/span>\r\n                        ;; Simulate long processing time that can cause race condition<\/span>\r\n                        (<\/span>Thread\/sleep<\/span> 3000<\/span>)<\/span>\r\n                        (<\/span>update<\/span> entity<\/span> :count<\/span> (<\/span>fnil<\/span> +<\/span> 0<\/span> 0<\/span>)<\/span> (<\/span>:inc<\/span> data<\/span>))))<\/span>\r\n        (<\/span>j\/peek<\/span> (<\/span>fn<\/span> [[<\/span>_<\/span> v<\/span>]]<\/span>\r\n                  (<\/span>log\/info<\/span> \"Updated entity:\"<\/span> v<\/span>)))<\/span>\r\n\r\n        ;; Put updated entity to state store<\/span>\r\n        (<\/span>j\/transform<\/span>  (<\/span>lambdas\/transformer-with-ctx<\/span>\r\n                       (<\/span>fn<\/span> [<\/span>ctx<\/span> k<\/span> v<\/span>]<\/span>\r\n                         (<\/span>let<\/span> [<\/span>store<\/span> (<\/span>.getStateStore<\/span> ctx<\/span> store-name<\/span>)]<\/span>\r\n                           (<\/span>.put<\/span> store<\/span> k<\/span> v<\/span>)<\/span>\r\n                           (<\/span>key-value<\/span> [<\/span>k<\/span> v<\/span>]))))<\/span>\r\n                      [<\/span>store-name<\/span>])<\/span>\r\n        (<\/span>doto<\/span> #<\/span>_branch<\/span>\r\n          ;; Publish updated entity to Entity topic<\/span>\r\n          (<\/span>j\/to<\/span> entity-topic<\/span>)<\/span>\r\n          ;; Publish output event to Event topic<\/span>\r\n          (<\/span>-><\/span> (<\/span>j\/map-values<\/span> (<\/span>fn<\/span> [<\/span>v<\/span>]<\/span> {<\/span>:type<\/span> :entity-updated<\/span> :data<\/span> v<\/span>}))<\/span>\r\n              (<\/span>j\/to<\/span> event-topic<\/span>)))))<\/span>\r\n  builder<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u30c8\u30dd\u30ed\u30b8\u30fc\u304c\u5927\u898f\u6a21\u306b\u306a\u3063\u3066\u304f\u308b\u3068\u3001\u751f\u306e Streams DSL \u3067\u306f\u5168\u4f53\u306e\u30c8\u30dd\u30ed\u30b8\u30fc\u69cb\u6210\u3092\u898b\u901a\u3059\u306e\u304c\u96e3\u3057\u304f\u306a\u3063\u3066\u304d\u307e\u3059\u304c\u3001Clojure \u3067\u66f8\u304f\u3068\u3042\u308b\u7a0b\u5ea6\u5168\u4f53\u306e\u69cb\u9020\u304c\u898b\u901a\u3057\u6613\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002\u305d\u3082\u305d\u3082 Clojure \u306e Immutable \u306e\u601d\u60f3\u304c Kafka \u3068\u76f8\u6027\u304c\u3044\u3044\u3067\u3059\u3057\u3001Code as Data \u306e\u9762\u76ee\u8e8d\u5982\u3068\u3044\u3063\u305f\u3068\u3053\u308d\u3067\u3059\u306d\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
Clojure \u3067 Kafka Streams \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u66f8\u304f\u3068\u6c17\u6301\u3061\u304c\u826f\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u306e\u8a18\u4e8b\u306f Kafka Advent Calendar 2021 \u306e11\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002 \u524d\u56de\u306e\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-46711","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/46711-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u306f Kafka Advent Calendar 2021 \u306e11\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002 \u524d\u56de\u306e\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/46711-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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