Tag: connect

ElasticSearch: High Level Rest Client Connection

This entry is part 1 of 4 in the series ElasticSearch High Level Rest Client

In this tutorial I will show you how to use the ElasticSearch high level rest client.

First you will need to add the low level rest to the pom.

<properties>
	<elasticSearch.version>6.2.4</elasticSearch.version>
</properties>

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>${elasticSearch.version}</version>
</dependency>

Next you will need to specify the imports.

import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;

Now you can connect to ElasticSearch.

final List hosts = new ArrayList<>(Arrays.asList("localhost"));
final Integer port = 9200;
final String scheme = "http";
		
final HttpHost[] httpHosts = hosts.stream().map(host -> new HttpHost(host, port, scheme)).toArray(HttpHost[]::new);

final RestClientBuilder restClientBuilder = RestClient.builder(httpHosts);
final RestHighLevelClient restHighLevelClient = new RestHighLevelClient(restClientBuilder);

Now you can do whatever you need to!

ElasticSearch: Low Level Rest Client Connection

This entry is part 1 of 3 in the series ElasticSearch Low Level Rest Client

In this tutorial I will show you how to use the ElasticSearch low level rest client.

First you will need to add the low level rest to the pom.

<properties>
	<elasticSearch.version>6.2.4</elasticSearch.version>
</properties>

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-client</artifactId>
    <version>${elasticSearch.version}</version>
</dependency>

Next you will need to specify the imports.

import org.apache.http.HttpHost;
import org.elasticsearch.client.Response;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;

Now you can connect to ElasticSearch.

final RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost("localhost", 9200, "http"));
 
final RestClient restClient = builder.build();

Now you can do whatever you need to!

Hadoop & Java: Connect Remote Unsecured HDFS

In this tutorial I will show you how to connect to remote unsecured HDFS cluster using Java. If you haven’t install hdfs yet follow the tutorial.

POM.xml:

<dependency>
	<groupId>org.apache.hadoop</groupId>
	<artifactId>hadoop-client</artifactId>
	<version>2.9.1</version>
</dependency>

Imports:

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import java.net.URI;

Connect:

//Setup the configuration object.
final Configuration config = new Configuration();

//If you want you can add any properties you want here.

//Setup the hdfs file system object.
final FileSystem fs = FileSystem.get(new URI("hdfs://localhost:50070"), config);

//Do whatever you need to.