Apache Flink 與 Elasticsearch 的集成

Question

我正在嘗試將 Flink 與 Elasticsearch 2.1.1 集成，我正在使用 maven 依賴項

     <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-connector-elasticsearch2_2.10</artifactId>
        <version>1.1-SNAPSHOT</version>
    </dependency>

這是我從 Kafka 隊列中讀取事件的 Java 代碼（工作正常），但不知何故，事件沒有在 Elasticsearch 中發布，也沒有錯誤，如果我更改任何相關設置，則在下面的代碼中到 ElasticSearch 的端口、主機名、集群名稱或索引名稱，然后我立即看到一個錯誤，但目前它沒有顯示任何錯誤，也沒有在 ElasticSearch 中創建任何新文檔

       StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

    // parse user parameters
    ParameterTool parameterTool = ParameterTool.fromArgs(args);

    DataStream<String> messageStream = env.addSource(new FlinkKafkaConsumer082<>(parameterTool.getRequired("topic"), new SimpleStringSchema(), parameterTool.getProperties()));

    messageStream.print();

    Map<String, String> config = new HashMap<>();
    config.put(ElasticsearchSink.CONFIG_KEY_BULK_FLUSH_MAX_ACTIONS, "1");
    config.put(ElasticsearchSink.CONFIG_KEY_BULK_FLUSH_INTERVAL_MS, "1");

    config.put("cluster.name", "FlinkDemo");

    List<InetSocketAddress> transports = new ArrayList<>();
    transports.add(new InetSocketAddress(InetAddress.getByName("localhost"), 9300));

    messageStream.addSink(new ElasticsearchSink<String>(config, transports, new TestElasticsearchSinkFunction()));

    env.execute();
}
private static class TestElasticsearchSinkFunction implements ElasticsearchSinkFunction<String> {
    private static final long serialVersionUID = 1L;

    public IndexRequest createIndexRequest(String element) {
        Map<String, Object> json = new HashMap<>();
        json.put("data", element);

        return Requests.indexRequest()
                .index("flink").id("hash"+element).source(json);
    }

    @Override
    public void process(String element, RuntimeContext ctx, RequestIndexer indexer) {
        indexer.add(createIndexRequest(element));
    }
}

Answer 1

我確實在本地機器上運行它並進行調試，但是，我唯一缺少的是正確配置日志記錄，因為大多數彈性問題都在“log.warn”語句中描述。 問題是 elasticsearch-2.2.1 客戶端 API 中“BulkRequestHandler.java”中的異常，它拋出錯誤 -“org.elasticsearch.action.ActionRequestValidationException: Validation Failed: 1: type is missing;” 因為我創建了索引但不是我覺得很奇怪的類型，因為它應該主要關注索引並默認創建類型。

Answer 2

我找到了一個很好的 Flink & Elasticsearch Connector例子

第一個 Maven 依賴項：

<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-connector-elasticsearch2_2.10</artifactId>
  <version>1.1-SNAPSHOT</version>
</dependency>

第二個示例 Java 代碼

public static void writeElastic(DataStream<String> input) {

    Map<String, String> config = new HashMap<>();

    // This instructs the sink to emit after every element, otherwise they would be buffered
    config.put("bulk.flush.max.actions", "1");
    config.put("cluster.name", "es_keira");

    try {
        // Add elasticsearch hosts on startup
        List<InetSocketAddress> transports = new ArrayList<>();
        transports.add(new InetSocketAddress("127.0.0.1", 9300)); // port is 9300 not 9200 for ES TransportClient

        ElasticsearchSinkFunction<String> indexLog = new ElasticsearchSinkFunction<String>() {
            public IndexRequest createIndexRequest(String element) {
                String[] logContent = element.trim().split("\t");
                Map<String, String> esJson = new HashMap<>();
                esJson.put("IP", logContent[0]);
                esJson.put("info", logContent[1]);

                return Requests
                        .indexRequest()
                        .index("viper-test")
                        .type("viper-log")
                        .source(esJson);
            }

            @Override
            public void process(String element, RuntimeContext ctx, RequestIndexer indexer) {
                indexer.add(createIndexRequest(element));
            }
        };

        ElasticsearchSink esSink = new ElasticsearchSink(config, transports, indexLog);
        input.addSink(esSink);
    } catch (Exception e) {
        System.out.println(e);
    }
}