{"id":46945,"date":"2023-09-29T11:58:37","date_gmt":"2023-02-02T04:04:31","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8kafka-streams%e5%af%b9sensortag%e8%bf%9b%e8%a1%8c%e7%aa%97%e5%8f%a3%e8%81%9a%e5%90%88%e3%80%82\/"},"modified":"2024-05-04T02:03:36","modified_gmt":"2024-05-03T18:03:36","slug":"%e4%bd%bf%e7%94%a8kafka-streams%e5%af%b9sensortag%e8%bf%9b%e8%a1%8c%e7%aa%97%e5%8f%a3%e8%81%9a%e5%90%88%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8kafka-streams%e5%af%b9sensortag%e8%bf%9b%e8%a1%8c%e7%aa%97%e5%8f%a3%e8%81%9a%e5%90%88%e3%80%82\/","title":{"rendered":"\u4f7f\u7528Kafka Streams\u5bf9SensorTag\u8fdb\u884c\u7a97\u53e3\u805a\u5408"},"content":{"rendered":"

\u6211\u5011\u5728Jupyter\u7684\u904b\u884c\u74b0\u5883\u4e2d\u4f7f\u7528PySpark Streaming\u4f86\u8a66\u9a57SensorTag\u7684\u6578\u64da\u9032\u884c\u7a97\u53e3\u805a\u5408\u3002\u5118\u7ba1\u6709\u5e7e\u500b\u5176\u4ed6\u7684\u6d41\u8655\u7406\u6846\u67b6\u53ef\u4f9b\u9078\u64c7\uff0c\u4f46\u4e0b\u4e00\u6b65\u6211\u5011\u5c07\u5617\u8a66\u4f7f\u7528Kafka Streams\u3002\u8207Spark\u4e0d\u540c\u7684\u662f\uff0cKafka Streams\u4e0d\u662f\u4e00\u500b\u96c6\u7fa4\uff0c\u800c\u662f\u4e00\u500b\u5eab\u3002\u76ee\u524d\uff0c\u5b98\u65b9\u53ea\u652f\u6301Java\u4f5c\u70ba\u958b\u767c\u8a9e\u8a00\u3002<\/p>\n

Java\u73af\u5883<\/h2>\n

\u6211\u6253\u7b97\u4f7f\u7528Maven\u5728Ubuntu 16.04\u4e0a\u642d\u5efa\u7684Eclim\u6765\u7f16\u5199\u4ee3\u7801\u3002<\/p>\n

\u9879\u76ee<\/h2>\n

\u5728\u9879\u76ee\u76ee\u5f55\u4e2d\u521b\u5efa\u4ee5\u4e0b\u6587\u4ef6\u3002\u5b8c\u6574\u7684\u4ee3\u7801\u5728\u8fd9\u4e2a\u5b58\u50a8\u5e93\u4e2d\u3002<\/p>\n

$ <\/span> tree\r\n.<\/span>\r\n\u251c\u2500\u2500 pom.xml\r\n\u2514\u2500\u2500 src\r\n    \u2514\u2500\u2500 main\r\n        \u251c\u2500\u2500 java\r\n        \u2502\u00a0\u00a0 \u2514\u2500\u2500 com\r\n        \u2502\u00a0\u00a0     \u2514\u2500\u2500 github\r\n        \u2502\u00a0\u00a0         \u2514\u2500\u2500 masato\r\n        \u2502\u00a0\u00a0             \u2514\u2500\u2500 streams\r\n        \u2502\u00a0\u00a0                 \u2514\u2500\u2500 kafka\r\n        \u2502\u00a0\u00a0                     \u251c\u2500\u2500 App.java\r\n        \u2502\u00a0\u00a0                     \u251c\u2500\u2500 SensorSumDeserializer.java\r\n        \u2502\u00a0\u00a0                     \u251c\u2500\u2500 SensorSum.java\r\n        \u2502\u00a0\u00a0                     \u2514\u2500\u2500 SensorSumSerializer.java\r\n        \u2514\u2500\u2500 resources\r\n            \u2514\u2500\u2500 logback.xml\r\n\r\n9 directories, 7 files\r\n<\/code><\/pre>\n
App.java\u7684\u6c49\u8bed\u7ffb\u8bd1\u9009\u9879\uff1a\u4e3b\u7a0b\u5e8f.java<\/h2>\n
\u5c06\u4ee3\u7801\u5206\u6210\u51e0\u4e2a\u90e8\u5206\u8fdb\u884c\u8bf4\u660e\u3002<\/p>\n
\u6570\u503c\u7684\u8bbe\u5b9a<\/h3>\n
\u4e3b\u9898\u540d\u79f0\u7b49\u5c06\u4ecepom.xml\u4e2d\u5b9a\u4e49\u7684\u73af\u5883\u53d8\u91cf\u4e2d\u83b7\u53d6\u3002WINDOWS_MINUTES\u662f\u7a97\u53e3\u805a\u5408\u7684\u65f6\u95f4\u95f4\u9694\u3002COMMIT_MINUTES\u662fKafka\u81ea\u52a8\u63d0\u4ea4\u7f13\u5b58\u7684\u65f6\u95f4\u95f4\u9694\uff0c\u540e\u9762\u4f1a\u8be6\u7ec6\u8bf4\u660e\u3002\u5728\u8fd9\u91cc\u4ee5\u5206\u949f\u4e3a\u5355\u4f4d\u6307\u5b9a\u3002<\/p>\n
public<\/span> class<\/span> App<\/span> {<\/span>\r\n\r\n    private<\/span> static<\/span> final<\/span> Logger<\/span> LOG<\/span> =<\/span> LoggerFactory<\/span>.<\/span>getLogger<\/span>(<\/span>App<\/span>.<\/span>class<\/span>);<\/span>\r\n\r\n    private<\/span> static<\/span> final<\/span> String<\/span> SOURCE_TOPIC<\/span> =<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"SOURCE_TOPIC\"<\/span>);<\/span>\r\n    private<\/span> static<\/span> final<\/span> String<\/span> SINK_TOPIC<\/span> =<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"SINK_TOPIC\"<\/span>);<\/span>\r\n    private<\/span> static<\/span> final<\/span> long<\/span> WINDOWS_MINUTES<\/span> =<\/span> 2L<\/span>;<\/span>\r\n    private<\/span> static<\/span> final<\/span> long<\/span> COMMIT_MINUTES<\/span> =<\/span> 3L<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5e8f\u5217\u5316<\/h3>\n
\u521b\u5efa\u8bb0\u5f55\u7684\u5e8f\u5217\u5316\u5668\u548c\u53cd\u5e8f\u5217\u5316\u5668\u3002\u5728Kafka Streams\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5c06\u5904\u7406\u7684\u4e2d\u95f4\u7ed3\u679c\u4fdd\u5b58\u5230\u4e3b\u9898\u4e2d\uff0c\u5e76\u5b9e\u73b0\u6d41\u7a0b\u3002\u5b9a\u4e49\u4e00\u4e2aSerDe\u6765\u540c\u65f6\u5904\u7406\u4ece\u4e3b\u9898\u4e2d\u8bfb\u53d6\u8bb0\u5f55\u7684\u53cd\u5e8f\u5217\u5316\u5668\u548c\u5199\u5165\u8bb0\u5f55\u7684\u5e8f\u5217\u5316\u5668\u3002SerDe\u9700\u8981\u6839\u636e\u4e3b\u9898\u7684\u952e\u548c\u503c\u7684\u7c7b\u578b\u6765\u5b9a\u4e49\u3002<\/p>\n
    \n
  • \n
      jsonSerde<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          SensorTag\u306e\u30ec\u30b3\u30fc\u30c9\u306f\u30ad\u30fc\u306f\u6587\u5b57\u5217\u3001\u5024\u306fJackson\u306eJsonNode\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \n
          • \n
              sensorSumSerde<\/ul>\n<\/li>\n<\/ul>\n
               <\/p>\n
                \n
              • \n
                  SenroSum\u306f\u30ab\u30b9\u30bf\u30e0\u3067\u4f5c\u6210\u3057\u305f\u5468\u56f2\u6e29\u5ea6 (ambient)\u3068\u30a6\u30a3\u30f3\u30c9\u30a6\u96c6\u8a08\u306e\u72b6\u614b\u3092\u4fdd\u6301\u3059\u308b\u30af\u30e9\u30b9\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    \n
                  • \n
                      stringSerde<\/ul>\n<\/li>\n<\/ul>\n
                       <\/p>\n
                        \n
                      • \n
                          \u30c7\u30d5\u30a9\u30eb\u30c8\u306eString\u7528\u306eSerDe\u3067\u3059\u3002\u4eca\u56de\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30ad\u30fc\u306f\u3059\u3079\u3066String\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
                           <\/p>\n
                            \n
                          • \n
                              doubleSerde<\/ul>\n<\/li>\n<\/ul>\n
                               <\/p>\n
                                \u30c7\u30d5\u30a9\u30eb\u30c8\u306edouble\u7528\u306eSerDe\u3067\u3059\u3002SensorTag\u306e\u5468\u56f2\u6e29\u5ea6 (ambient)\u306fdouble\u3067\u30a6\u30a3\u30f3\u30c9\u30a6\u96c6\u8a08\u3057\u307e\u3059\u3002<\/ul>\n
                                    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n\r\n        final<\/span> Serializer<\/span><<\/span>JsonNode<\/span>><\/span> jsonSerializer<\/span> =<\/span> new<\/span> JsonSerializer<\/span>();<\/span>\r\n        final<\/span> Deserializer<\/span><<\/span>JsonNode<\/span>><\/span> jsonDeserializer<\/span> =<\/span> new<\/span> JsonDeserializer<\/span>();<\/span>\r\n        final<\/span> Serde<\/span><<\/span>JsonNode<\/span>><\/span> jsonSerde<\/span> =<\/span>\r\n            Serdes<\/span>.<\/span>serdeFrom<\/span>(<\/span>jsonSerializer<\/span>,<\/span> jsonDeserializer<\/span>);<\/span>\r\n\r\n        final<\/span> Serializer<\/span><<\/span>SensorSum<\/span>><\/span> sensorSumSerializer<\/span> =<\/span>\r\n            new<\/span> SensorSumSerializer<\/span>();<\/span>\r\n        final<\/span> Deserializer<\/span><<\/span>SensorSum<\/span>><\/span> sensorSumDeserializer<\/span> =<\/span>\r\n            new<\/span> SensorSumDeserializer<\/span>();<\/span>\r\n        final<\/span> Serde<\/span><<\/span>SensorSum<\/span>><\/span> sensorSumSerde<\/span> =<\/span>\r\n            Serdes<\/span>.<\/span>serdeFrom<\/span>(<\/span>sensorSumSerializer<\/span>,<\/span>\r\n                             sensorSumDeserializer<\/span>);<\/span>\r\n\r\n        final<\/span> Serde<\/span><<\/span>String<\/span>><\/span> stringSerde<\/span> =<\/span> Serdes<\/span>.<\/span>String<\/span>();<\/span>\r\n        final<\/span> Serde<\/span><<\/span>Double<\/span>><\/span> doubleSerde<\/span> =<\/span> Serdes<\/span>.<\/span>Double<\/span>();<\/span>\r\n<\/code><\/pre>\n
                                \u521b\u5efaKStream<\/h3>\n
                                \u9996\u5148\u8c03\u7528KStreamBuilder\u7684stream()\u51fd\u6570\u6765\u521b\u5efaKStream\u3002\u5176\u4e2d\uff0ctopic\u7684\u952e\u662f\u5b57\u7b26\u4e32\uff0c\u5e76\u6307\u5b9a\u4e86\u503c\u4e3aJsonNode\u7684SerDe\u3002<\/p>\n
                                        final<\/span> KStreamBuilder<\/span> builder<\/span> =<\/span> new<\/span> KStreamBuilder<\/span>();<\/span>\r\n\r\n        LOG<\/span>.<\/span>info<\/span>(<\/span>\"Starting Sorting Job\"<\/span>);<\/span>\r\n\r\n        final<\/span> KStream<\/span><<\/span>String<\/span>,<\/span> JsonNode<\/span>><\/span> source<\/span> =<\/span>\r\n            builder<\/span>.<\/span>stream<\/span>(<\/span>stringSerde<\/span>,<\/span> jsonSerde<\/span>,<\/span> SOURCE_TOPIC<\/span>);<\/span>\r\n<\/code><\/pre>\n
                                \u521b\u5efaKGroupedStream<\/h3>\n
                                SensorTag\u7684\u6570\u636e\u4ee5JSON\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u4ece\u6811\u8393\u6d3e3\u53d1\u9001\u5230Kafka\u4e3b\u9898\u3002<\/p>\n
                                {<\/span>'<\/span>bid<\/span>'<\/span>:<\/span> '<\/span>B0:B4:48:BE:5E:00<\/span>'<\/span>,<\/span> '<\/span>time<\/span>'<\/span>:<\/span> 1502152524<\/span>,<\/span> '<\/span>humidity<\/span>'<\/span>:<\/span> 27.26287841796875<\/span>,<\/span> '<\/span>objecttemp<\/span>'<\/span>:<\/span> 21.1875<\/span>,<\/span> '<\/span>ambient<\/span>'<\/span>:<\/span> 27.03125<\/span>,<\/span> '<\/span>rh<\/span>'<\/span>:<\/span> 75.311279296875<\/span>}<\/span>\r\n<\/code><\/pre>\n
                                KStream\u7684\u8bb0\u5f55\u662f\u5177\u6709\u952e\u548c\u503c\u7684KeyValue\u5bf9\u8c61\u3002\u5728\u793a\u4f8b\u4e2d\uff0c\u4e3a\u4e86\u4ec5\u5bf9\u73af\u5883\u6e29\u5ea6\u7684\u5e73\u5747\u503c\u8fdb\u884c\u7a97\u53e3\u805a\u5408\uff0c\u6211\u4eec\u8c03\u7528map()\u751f\u6210\u4e00\u4e2a\u65b0\u7684KStream\uff0c\u5b83\u53ea\u5305\u542b\u952e\u548c\u73af\u5883\u6e29\u5ea6\u7684\u5bf9\u3002<\/p>\n
                                \u7136\u540e\u8c03\u7528groupByKey()\u65b9\u6cd5\uff0c\u6839\u636e\u952e\u8fdb\u884c\u5206\u7ec4\u5e76\u521b\u5efa\u4e00\u4e2aKGroupedStream\u3002\u8bb0\u5f55\u7684\u952e\u662f\u5b57\u7b26\u4e32\uff0c\u503c\u662f\u5468\u56f4\u6e29\u5ea6\u7684double\uff0c\u56e0\u6b64\u9700\u8981\u6307\u5b9a\u5404\u81ea\u7684SerDe\u3002<\/p>\n
                                        final<\/span> KGroupedStream<\/span><<\/span>String<\/span>,<\/span> Double<\/span>><\/span> sensors<\/span> =<\/span>\r\n            source<\/span>\r\n            .<\/span>map<\/span>((<\/span>k<\/span>,<\/span> v<\/span>)<\/span> -><\/span> {<\/span>\r\n                    double<\/span> ambient<\/span> =<\/span> v<\/span>.<\/span>get<\/span>(<\/span>\"ambient\"<\/span>).<\/span>asDouble<\/span>();<\/span>\r\n                    return<\/span> KeyValue<\/span>.<\/span>pair<\/span>(<\/span>k<\/span>,<\/span> ambient<\/span>);<\/span>\r\n                })<\/span>\r\n            .<\/span>groupByKey<\/span>(<\/span>stringSerde<\/span>,<\/span> doubleSerde<\/span>);<\/span>\r\n<\/code><\/pre>\n
                                \u4f7f\u7528KStram\u521b\u5efaKTable<\/h3>\n
                                \u8c03\u7528KGroupedStream\u7684aggregate()\u65b9\u6cd5\u5c06\u521b\u5efa\u4e00\u4e2aKTable\u3002KTable\u5c06\u6309\u952e\u548c\u6307\u5b9a\u7684\u7a97\u53e3\u95f4\u9694\u4fdd\u6301\u8bb0\u5f55\u7684\u603b\u548c\u548c\u8bb0\u5f55\u6570\u7684\u72b6\u6001\u3002<\/p>\n
                                \u5728`aggregate()`\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570`Initializer`\u88ab\u7528\u4e8e\u521d\u59cb\u5316\u5728\u6d41\u805a\u5408\u4e2d\u4f7f\u7528\u7684\u805a\u5408\u5668\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u521d\u59cb\u5316\u4e86\u7528\u4e8e\u7a97\u53e3\u805a\u5408\u72b6\u6001\u7684`SensorSum`\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5b9e\u73b0\u4e86\u805a\u5408\u5668\u3002\u5b83\u63a5\u6536\u5f53\u524d\u8bb0\u5f55\u7684\u952e\u503c\u3001\u4e0a\u4e00\u6b21\u8bb0\u5f55\u5904\u7406\u4e2d\u521b\u5efa\u7684`SensorSum`\u3002\u6bcf\u6b21\u6570\u636e\u5230\u8fbe\u65f6\uff0c\u5b83\u4f1a\u5c06\u603b\u548c\u548c\u8bb0\u5f55\u6570\u76f8\u52a0\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684`SensorSum`\u3002\u7b2c\u4e09\u4e2a\u53c2\u6570\u5b9a\u4e49\u4e86\u4e00\u4e2a2\u5206\u949f\u7684`TimeWindows`\u3002\u7b2c\u56db\u4e2a\u53c2\u6570\u662f`SensorSum`\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u5668\uff0c\u7b2c\u4e94\u4e2a\u53c2\u6570\u662f\u7528\u4e8e\u4fdd\u6301\u72b6\u6001\u7684\u4e3b\u9898\u540d\u79f0\u3002<\/p>\n
                                        final<\/span> KTable<\/span><<\/span>Windowed<\/span><<\/span>String<\/span>>,<\/span> SensorSum<\/span>><\/span> sensorAgg<\/span> =<\/span>\r\n            sensors<\/span>\r\n            .<\/span>aggregate<\/span>(()<\/span> -><\/span> new<\/span> SensorSum<\/span>(<\/span>0<\/span>D<\/span>,<\/span> 0<\/span>)<\/span>\r\n                       ,<\/span> (<\/span>aggKey<\/span>,<\/span> value<\/span>,<\/span> agg<\/span>)<\/span> -><\/span> new<\/span> SensorSum<\/span>(<\/span>agg<\/span>.<\/span>sum<\/span> +<\/span> value<\/span>,<\/span> agg<\/span>.<\/span>count<\/span> +<\/span> 1<\/span>)<\/span>\r\n                       ,<\/span> TimeWindows<\/span>.<\/span>of<\/span>(<\/span>TimeUnit<\/span>.<\/span>MINUTES<\/span>.<\/span>toMillis<\/span>(<\/span>WINDOWS_MINUTES<\/span>))<\/span>\r\n                       ,<\/span> sensorSumSerde<\/span>,<\/span>\r\n                       \"sensorSum\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
                                \u4eceKTable\u521b\u5efaKStream\u3002<\/h3>\n
                                \u4f7f\u7528KTable\u7684mapValues()\u51fd\u6570\u8ba1\u7b97\u5e73\u5747\u503c\u3002\u5c06\u603b\u548c\u9664\u4ee5\u8bb0\u5f55\u6570\u5f97\u5230\u7684\u5e73\u5747\u503c\u662f\u4e00\u4e2a\u65b0\u7684Double\u7c7b\u578b\u8bb0\u5f55\u7684KTable\u3002\u7136\u540e\u8c03\u7528toStream()\u51fd\u6570\u521b\u5efaKStream\u3002\u5c06\u8bb0\u5f55\u683c\u5f0f\u5316\u4e3a\u65f6\u95f4\u6233\u3001\u952e\u3001\u5e73\u5747\u503c\u7684JSON\u5b57\u7b26\u4e32\u5e76\u8f93\u51fa\u5230\u6d41\u4e2d\u3002\u65f6\u95f4\u6233\u91c7\u7528ISO 8601\u683c\u5f0f\uff0c\u4ee5\u4fbf\u5728\u4e0d\u540c\u7cfb\u7edf\u4e4b\u95f4\u65b9\u4fbf\u8fdb\u884c\u6570\u636e\u4ea4\u6362\u3002\u6700\u540e\u5c06\u8bb0\u5f55\u4fdd\u5b58\u5230\u6307\u5b9a\u7684\u4e3b\u9898\uff0c\u5e76\u7ed3\u675f\u3002<\/p>\n
                                        final<\/span> DateTimeFormatter<\/span> fmt<\/span> =<\/span>\r\n            DateTimeFormatter<\/span>.<\/span>ISO_OFFSET_DATE_TIME<\/span>;<\/span>\r\n\r\n        sensorAgg<\/span>\r\n            .<<\/span>Double<\/span>><\/span>mapValues<\/span>((<\/span>v<\/span>)<\/span> -><\/span> ((<\/span>double<\/span>)<\/span> v<\/span>.<\/span>sum<\/span> \/<\/span> v<\/span>.<\/span>count<\/span>))<\/span>\r\n            .<\/span>toStream<\/span>()<\/span>\r\n            .<\/span>map<\/span>((<\/span>key<\/span>,<\/span> avg<\/span>)<\/span> -><\/span> {<\/span>\r\n                    long<\/span> end<\/span> =<\/span> key<\/span>.<\/span>window<\/span>().<\/span>end<\/span>();<\/span>\r\n                    ZonedDateTime<\/span> zdt<\/span> =<\/span>\r\n                        new<\/span> Date<\/span>(<\/span>end<\/span>).<\/span>toInstant<\/span>()<\/span>\r\n                        .<\/span>atZone<\/span>(<\/span>ZoneId<\/span>.<\/span>systemDefault<\/span>());<\/span>\r\n                    String<\/span> time<\/span> =<\/span> fmt<\/span>.<\/span>format<\/span>(<\/span>zdt<\/span>);<\/span>\r\n                    String<\/span> bid<\/span> =<\/span> key<\/span>.<\/span>key<\/span>();<\/span>\r\n                    String<\/span> retval<\/span> =<\/span>\r\n                        String<\/span>.<\/span>format<\/span>(<\/span>\"{\\\"time\\\": \\\"%s\\\", \\\"bid\\\": \\\"%s\\\", \\\"ambient\\\": %f}\"<\/span>,<\/span>\r\n                                      time<\/span>,<\/span> bid<\/span>,<\/span> avg<\/span>);<\/span>\r\n                    LOG<\/span>.<\/span>info<\/span>(<\/span>retval<\/span>);<\/span>\r\n                    return<\/span> new<\/span> KeyValue<\/span><<\/span>String<\/span>,<\/span>String<\/span>>(<\/span>bid<\/span>,<\/span> retval<\/span>);<\/span>\r\n             })<\/span>\r\n            .<\/span>to<\/span>(<\/span>SINK_TOPIC<\/span>);<\/span>\r\n<\/code><\/pre>\n
                                \u5f00\u59cbKafka Streams<\/h3>\n
                                \u4f7f\u7528\u8bbe\u7f6e\u5bf9\u8c61\u548c\u6784\u5efa\u5668\u521b\u5efaKafkaStreams\uff0c\u5e76\u542f\u52a8Kafka Streams\u5e94\u7528\u7a0b\u5e8f\u3002\u8fd8\u9700\u8981\u5728SIGTERM\u65f6\u5c06Kafka Stream\u6ce8\u518c\u5230\u5173\u95ed\u6302\u94a9\u4e2d\u4ee5\u505c\u6b62\u5b83\u3002<\/p>\n
                                        final<\/span> StreamsConfig<\/span> config<\/span> =<\/span> new<\/span> StreamsConfig<\/span>(<\/span>getProperties<\/span>());<\/span>\r\n        final<\/span> KafkaStreams<\/span> streams<\/span> =<\/span> new<\/span> KafkaStreams<\/span>(<\/span>builder<\/span>,<\/span> config<\/span>);<\/span>\r\n        streams<\/span>.<\/span>start<\/span>();<\/span>\r\n\r\n        Runtime<\/span>.<\/span>getRuntime<\/span>().<\/span>addShutdownHook<\/span>(<\/span>new<\/span> Thread<\/span>(<\/span>streams:<\/span>:<\/span>close<\/span>));<\/span>\r\n<\/code><\/pre>\n
                                \u5173\u4e8eKafka Streams\u7684\u8bbe\u7f6e\u548c\u8d85\u65f6\u95ee\u9898<\/h3>\n
                                \u4ece\u73af\u5883\u53d8\u91cf\u7b49\u521b\u5efa\u7528\u4e8eKafka Streams\u8bbe\u7f6e\u7684\u5c5e\u6027\u3002<\/p>\n
                                    private<\/span> static<\/span> Properties<\/span> getProperties<\/span>()<\/span> {<\/span>\r\n        Properties<\/span> props<\/span> =<\/span> new<\/span> Properties<\/span>();<\/span>\r\n        props<\/span>.<\/span>put<\/span>(<\/span>StreamsConfig<\/span>.<\/span>APPLICATION_ID_CONFIG<\/span>,<\/span>\r\n                  System<\/span>.<\/span>getenv<\/span>(<\/span>\"APPLICATION_ID_CONFIG\"<\/span>));<\/span>\r\n        props<\/span>.<\/span>put<\/span>(<\/span>StreamsConfig<\/span>.<\/span>BOOTSTRAP_SERVERS_CONFIG<\/span>,<\/span>\r\n                  System<\/span>.<\/span>getenv<\/span>(<\/span>\"BOOTSTRAP_SERVERS_CONFIG\"<\/span>));<\/span>\r\n        props<\/span>.<\/span>put<\/span>(<\/span>StreamsConfig<\/span>.<\/span>KEY_SERDE_CLASS_CONFIG<\/span>,<\/span>\r\n                  Serdes<\/span>.<\/span>String<\/span>().<\/span>getClass<\/span>().<\/span>getName<\/span>());<\/span>\r\n        props<\/span>.<\/span>put<\/span>(<\/span>StreamsConfig<\/span>.<\/span>VALUE_SERDE_CLASS_CONFIG<\/span>,<\/span>\r\n                  Serdes<\/span>.<\/span>String<\/span>().<\/span>getClass<\/span>().<\/span>getName<\/span>());<\/span>\r\n        props<\/span>.<\/span>put<\/span>(<\/span>StreamsConfig<\/span>.<\/span>TIMESTAMP_EXTRACTOR_CLASS_CONFIG<\/span>,<\/span>\r\n                  WallclockTimestampExtractor<\/span>.<\/span>class<\/span>.<\/span>getName<\/span>());<\/span>\r\n        props<\/span>.<\/span>put<\/span>(<\/span>StreamsConfig<\/span>.<\/span>COMMIT_INTERVAL_MS_CONFIG<\/span>,<\/span>\r\n                  TimeUnit<\/span>.<\/span>MINUTES<\/span>.<\/span>toMillis<\/span>(<\/span>COMMIT_MINUTES<\/span>));<\/span>\r\n\r\n        return<\/span> props<\/span>;<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                                COMMIT_INTERVAL_MS_CONFIG\u7684\u4e2d\u6587\u91ca\u4e49\u4e3a\u201c\u63d0\u4ea4\u95f4\u9694\u6beb\u79d2\u914d\u7f6e\u201d\u3002<\/h3>\n
                                \u5728\u6700\u521d\u7684\u65f6\u5019\uff0cStreamsConfig.COMMIT_INTERVAL_MS_CONFIG\u6ca1\u6709\u8fdb\u884c\u66f4\u6539\u3002\u5728\u5c06\u8bb0\u5f55\u4fdd\u5b58\u5230\u4e3b\u9898\u4e4b\u524d\uff0c\u6211\u4eec\u5728KStream\u7684map()\u4e2d\u8f93\u51fa\u4e86\u65e5\u5fd7\u3002\u6211\u60f3\u8981\u57282\u5206\u949f\u7684\u7a97\u53e3\u95f4\u9694\u5185\u53ea\u8f93\u51fa\u4e00\u6b21\u6700\u540e\u7684\u805a\u5408\u7ed3\u679c\uff0c\u4f46\u7ed3\u679c\u5374\u91cd\u590d\u51fa\u73b0\u4e864-5\u6b21\uff0c\u4e14\u6b21\u6570\u4e0d\u786e\u5b9a\u3002<\/p>\n
                                {\"time\": \"2017-08-08T10:34:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.343750}\r\n{\"time\": \"2017-08-08T10:34:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.385417}\r\n{\"time\": \"2017-08-08T10:34:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.410156}\r\n{\"time\": \"2017-08-08T10:34:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.440341}\r\n{\"time\": \"2017-08-08T10:34:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.450521}\r\n{\"time\": \"2017-08-08T10:36:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.562500}\r\n{\"time\": \"2017-08-08T10:36:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.562500}\r\n<\/code><\/pre>\n
                                \u6839\u636e\u4ee5\u4e0b\u53c2\u8003\u6587\u7ae0\uff0c\u8fd9\u4f3c\u4e4e\u662f\u671f\u671b\u4eceKTable\u7684\u53d8\u66f4\u5c65\u5386\uff08changelog stream\uff09\u8fd9\u4e2a\u7279\u6027\u4e2d\u83b7\u5f97\u7684\u884c\u4e3a\u3002KTable\u6ca1\u6709\u7a97\u53e3\u805a\u5408\u7684\u6700\u7ec8\u7ed3\u679c\u72b6\u6001\uff0c\u66f4\u65b0\u540e\u7684\u503c\u4f1a\u6309\u4e00\u5b9a\u65f6\u95f4\u95f4\u9694\u8fdb\u884c\u63d0\u4ea4\u66f4\u65b0\u5230\u7f13\u5b58\u4e2d\u3002\u5728\u5c06KTable\u8f6c\u6362\u4e3aKStream\u540e\uff0c\u9700\u8981\u81ea\u5df1\u5b9e\u73b0\u4f7f\u7528transform()\u6216process()\u6765\u53bb\u9664\u8bb0\u5f55\u91cd\u590d\u7684\u4ee3\u7801\u3002<\/p>\n
                                \u867d\u7136\u65e0\u6cd5\u5b8c\u5168\u6d88\u9664\u91cd\u590d\u7684\u8bb0\u5f55\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u589e\u52a0StreamsConfig.COMMIT_INTERVAL_MS_CONFIG\u7684\u503c\u6765\u51cf\u5c11\u7f13\u5b58\u63d0\u4ea4\u7684\u6b21\u6570\u3002\u9ed8\u8ba4\u503c\u4e3a30\u79d2\u3002<\/p>\n
                                  \n
                                • \n
                                    How to send final kafka-streams aggregation result of a time windowed KTable?<\/ul>\n<\/li>\n<\/ul>\n
                                     <\/p>\n
                                      \n
                                    • \n
                                        Immutable Record with Kafka Stream<\/ul>\n<\/li>\n<\/ul>\n
                                         <\/p>\n
                                          \n
                                        • \n
                                            Kafka KStreams – processing timeouts<\/ul>\n<\/li>\n<\/ul>\n
                                             <\/p>\n
                                              \n
                                            • \n
                                                Kafka Streams for Stream processing A few words about how Kafka works.<\/ul>\n<\/li>\n<\/ul>\n
                                                 <\/p>\n
                                                  Memory management<\/ul>\n
                                                  \u5176\u4ed6\u7684\u73ed\u7ea7<\/h2>\n
                                                  \u51c6\u5907\u6a21\u578b\uff08SensorSum.java\uff09\u3001\u5e8f\u5217\u5316\u5668\uff08SensorSumSerializer.java\uff09\u548c\u53cd\u5e8f\u5217\u5316\u5668\uff08SensorSumDeserializer.java\uff09\u7684\u7c7b\u3002\u5e8f\u5217\u5316\u5668\u5b9e\u73b0serialize()\u65b9\u6cd5\uff0c\u5c06SensorSum\u7684\u5c5e\u6027\u8f6c\u6362\u4e3a\u5b57\u8282\u6570\u7ec4\u3002\u5b83\u5c06\u5206\u914d\u4e00\u4e2a8\u5b57\u8282\u7684Double\u7c7b\u578b\u7684\u5b57\u8282\u7f13\u51b2\u533a\u6765\u5b58\u50a8\u5468\u56f4\u6e29\u5ea6\u603b\u548c\uff0c\u5e76\u4f7f\u75284\u5b57\u8282\u7684Integer\u7c7b\u578b\u6765\u5b58\u50a8\u8bb0\u5f55\u6570\u3002<\/p>\n
                                                      public<\/span> byte<\/span>[]<\/span> serialize<\/span>(<\/span>String<\/span> topic<\/span>,<\/span> SensorSum<\/span> data<\/span>)<\/span> {<\/span>\r\n        ByteBuffer<\/span> buffer<\/span> =<\/span> ByteBuffer<\/span>.<\/span>allocate<\/span>(<\/span>8<\/span> +<\/span> 4<\/span>);<\/span>\r\n        buffer<\/span>.<\/span>putDouble<\/span>(<\/span>data<\/span>.<\/span>sum<\/span>);<\/span>\r\n        buffer<\/span>.<\/span>putInt<\/span>(<\/span>data<\/span>.<\/span>count<\/span>);<\/span>\r\n\r\n        return<\/span> buffer<\/span>.<\/span>array<\/span>();<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                                                  \u6267\u884c<\/h2>\n
                                                  \u7528Exec Maven Plugin\u6765\u6267\u884cKafka Streams\u3002<\/p>\n
                                                  $ <\/span>mvn clean install exec<\/span>:exec@json\r\n<\/code><\/pre>\n
                                                  \u6211\u5c1d\u8bd5\u5c06\u7a97\u53e3\u95f4\u9694\u8bbe\u7f6e\u4e3a2\u5206\u949f\uff0c\u5e76\u5c06\u7f13\u5b58\u63d0\u4ea4\u95f4\u9694\u6307\u5b9a\u4e3a3\u5206\u949f\u3002\u867d\u7136\u4f9d\u7136\u51fa\u73b0\u4e86\u51e0\u6b21\u91cd\u590d\u7684\u8f93\u51fa\uff0c\u4f46\u6210\u529f\u51cf\u5c11\u4e86\u91cd\u590d\u8f93\u51fa\u7684\u6b21\u6570\u3002<\/p>\n
                                                  {\"time\": \"2017-08-08T11:32:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.414773}\r\n{\"time\": \"2017-08-08T11:34:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.414063}\r\n{\"time\": \"2017-08-08T11:36:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.453125}\r\n{\"time\": \"2017-08-08T11:36:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.476563}\r\n{\"time\": \"2017-08-08T11:38:00+09:00\", \"bid\": \"B0:B4:48:BE:5E:00\", \"ambient\": 27.546875}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
                                                  \u6211\u5011\u5728Jupyter\u7684\u904b\u884c\u74b0\u5883\u4e2d\u4f7f\u7528PySpark Streaming\u4f86\u8a66\u9a57SensorTag\u7684\u6578\u64da\u9032\u884c\u7a97\u53e3\u805a […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-46945","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u4f7f\u7528Kafka Streams\u5bf9SensorTag\u8fdb\u884c\u7a97\u53e3\u805a\u5408 - 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\/\u4f7f\u7528kafka-streams\u5bf9sensortag\u8fdb\u884c\u7a97\u53e3\u805a\u5408\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528Kafka Streams\u5bf9SensorTag\u8fdb\u884c\u7a97\u53e3\u805a\u5408\" \/>\n<meta property=\"og:description\" content=\"\u6211\u5011\u5728Jupyter\u7684\u904b\u884c\u74b0\u5883\u4e2d\u4f7f\u7528PySpark Streaming\u4f86\u8a66\u9a57SensorTag\u7684\u6578\u64da\u9032\u884c\u7a97\u53e3\u805a […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528kafka-streams\u5bf9sensortag\u8fdb\u884c\u7a97\u53e3\u805a\u5408\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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