Tarun Sapra Tarun Sapra - 1 month ago 20
Java Question

Apache Flink integration with Elasticsearch

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>


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));
}
}

Answer

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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