Apache Flink 与 Elasticsearch 的集成 [英] Apache Flink integration with Elasticsearch

问题描述

我正在尝试将 Flink 与 Elasticsearch 2.1.1 集成，我正在使用 maven 依赖项

I am trying to integrate Flink with Elasticsearch 2.1.1, I am using the maven dependency

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

这是我从 Kafka 队列中读取事件的 Java 代码(工作正常)但不知何故这些事件没有在 Elasticsearch 中发布并且也没有错误，如果我更改了以下代码中的任何一个与 ElasticSearch 的端口、主机名、集群名称或索引名称相关的设置，然后我立即看到一个错误，但目前它没有显示任何错误，也没有在 ElasticSearch 中创建任何新文档

and here's the Java Code where I am reading the events from a Kafka queue (which works fine) but somehow the events are not getting posted in the Elasticsearch and there is no error either, in the below code if I change any of the settings related to port, hostname, cluster name or index name of ElasticSearch then immediately I see an error but currently it doesn't show any error nor any new documents get created in ElasticSearch

       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));
    }
}

推荐答案

我确实在本地机器上运行它并进行调试，但是，我唯一缺少的是正确配置日志记录，因为大多数弹性问题都是在log.warn"语句中描述.问题是 elasticsearch-2.2.1 客户端 API 中BulkRequestHandler.java"中的异常，它抛出错误 -org.elasticsearch.action.ActionRequestValidationException: Validation Failed: 1: type is missing;"因为我创建了索引但不是我觉得很奇怪的类型，因为它应该主要关注索引并默认创建类型.

I was indeed running it on the local machine and debugging as well but, the only thing I was missing is to properly configure logging, as most of elastic issues are described in "log.warn" statement. The issue was the exception inside "BulkRequestHandler.java" in elasticsearch-2.2.1 client API, which was throwing the error -"org.elasticsearch.action.ActionRequestValidationException: Validation Failed: 1: type is missing;" As I had created the index but not an type which I find pretty strange as it should be primarily be concerned with index and create the type by default.

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