如何将 JavaInputDStream JSON 转换为 ElasticSearch JAVA答案

【问题标题】：How to JavaInputDStream JSON to ElasticSearch JAVA如何将 JavaInputDStream JSON 转换为 ElasticSearch JAVA
【发布时间】：2018-01-12 10:09:20
【问题描述】：

大家好，我正在使用 kafka > spark streaming > Elasticsearch。但我不会将 Spark Streaming JavaInputDStream JSON 发送到 elasticsearch。

我的代码：

    SparkConf conf = new SparkConf()
            .setAppName("Streaming")
            .setMaster("local")
            .set("es.nodes","localhost:9200")
            .set("es.index.auto.create","true");
    JavaStreamingContext streamingContext = new JavaStreamingContext(conf, new Duration(5000));
    Map<String, Object> kafkaParams = new HashMap<>();
    kafkaParams.put("bootstrap.servers", "localhost:9092");
    kafkaParams.put("key.deserializer", StringDeserializer.class);
    kafkaParams.put("value.deserializer", StringDeserializer.class);
    kafkaParams.put("group.id", "exastax");
    kafkaParams.put("auto.offset.reset", "latest");
    kafkaParams.put("enable.auto.commit", false);

    Collection<String> topics = Arrays.asList("loglar");
    JavaInputDStream<ConsumerRecord<String, String>> stream =
            KafkaUtils.createDirectStream(
                    streamingContext,
                    LocationStrategies.PreferConsistent(),
                    ConsumerStrategies.<String, String>Subscribe(topics, kafkaParams)
            );

    JavaPairDStream<String, String> finisStream = stream.mapToPair(record -> new Tuple2<>("", record.value()));
    finisStream.print();
    JavaEsSparkStreaming.saveJsonToEs(finisStream,"spark/docs");
    streamingContext.start();
    streamingContext.awaitTermination();


}

JavaEsSparkStreaming.saveJsonToEs(finisStream,"spark/docs"); >> finisStream 不起作用，因为它不是 JavaDStream。如何转换JavaDStream？

【问题讨论】：

标签： apache-spark elasticsearch apache-kafka spark-streaming

【解决方案1】：

非常感谢您的回答！但我解决了这段代码：

 JavaDStream<String> stream1 = stream.map(
                new Function<ConsumerRecord<String, String>, String>() {
                    @Override
                    public String call(ConsumerRecord<String, String> r) {
                        return r.value();
                    }
                }
        );
           JavaEsSparkStreaming.saveJsonToEs(stream1,"spark/docs");

【讨论】：

【解决方案2】：

JavaEsSparkStreaming.saveJsonToEs 与 JavaDStream 一起使用

JavaEsSparkStreaming.saveToEsWithMeta 与 JavaPairDStream 一起使用

修复您的代码：

JavaDStream<String> finisStream = stream.map(new Function<Tuple2<String, String>, String>() {
    public String call(Tuple2<String, String> stringStringTuple2) throws Exception {
        return stringStringTuple2._2();
    }
});

JavaEsSparkStreaming.saveJsonToEs(finisStream,"");

【讨论】：