Spring Batch如何向Elasticsearch批量導入數據

這篇文章主要介紹了Spring Batch如何向Elasticsearch批量導入數據，具有一定借鑒價值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。

1.介紹

當系統有大量數據需要從數據庫導入Elasticsearch時，使用Spring Batch可以提高導入的效率。Spring Batch使用ItemReader分頁讀取數據，ItemWriter批量寫數據。由于Spring Batch沒有提供Elastisearch的ItemWriter和ItemReader，本示例中自定義一個ElasticsearchItemWriter(ElasticsearchItemReader)，用于批量導入。

2.示例

2.1 pom.xml

本文使用spring data jest連接ES（也可以使用spring data elasticsearch連接ES）,ES版本為5.5.3

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.hfcsbc.estl</groupId>
  <artifactId>es-etl</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>es-etl</name>
  <description>Demo project for Spring Boot</description>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.M7</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <dependency>
      <groupId>org.postgresql</groupId>
      <artifactId>postgresql</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-batch</artifactId>
    </dependency>

    <dependency>
      <groupId>com.github.vanroy</groupId>
      <artifactId>spring-boot-starter-data-jest</artifactId>
      <version>3.0.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>io.searchbox</groupId>
      <artifactId>jest</artifactId>
      <version>5.3.2</version>
    </dependency>

    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

  <repositories>
    <repository>
      <id>spring-snapshots</id>
      <name>Spring Snapshots</name>
      <url>https://repo.spring.io/snapshot</url>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </repository>
    <repository>
      <id>spring-milestones</id>
      <name>Spring Milestones</name>
      <url>https://repo.spring.io/milestone</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>

  </repositories>

  <pluginRepositories>
    <pluginRepository>
      <id>spring-snapshots</id>
      <name>Spring Snapshots</name>
      <url>https://repo.spring.io/snapshot</url>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
    </pluginRepository>
    <pluginRepository>
      <id>spring-milestones</id>
      <name>Spring Milestones</name>
      <url>https://repo.spring.io/milestone</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>
</project>

2.2 實體類及repository

package com.hfcsbc.esetl.domain;
import lombok.Data;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;

/**
 * Create by pengchao on 2018/2/23
 */
@Document(indexName = "person", type = "person", shards = 1, replicas = 0, refreshInterval = "-1")
@Entity
@Data
public class Person {
  @Id
  private Long id;
  private String name;
  @OneToOne
  @Field(type = FieldType.Nested)
  private Address address;
}

package com.hfcsbc.esetl.domain;
import lombok.Data;
import javax.persistence.Entity;
import javax.persistence.Id;
/**
 * Create by pengchao on 2018/2/23
 */
@Entity
@Data
public class Address {
  @Id
  private Long id;
  private String name;
}

package com.hfcsbc.esetl.repository.jpa;
import com.hfcsbc.esetl.domain.Person;
import org.springframework.data.jpa.repository.JpaRepository;
/**
 * Create by pengchao on 2018/2/23
 */
public interface PersonRepository extends JpaRepository<Person, Long> {
}

package com.hfcsbc.esetl.repository.es;
import com.hfcsbc.esetl.domain.Person;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
/**
 * Create by pengchao on 2018/2/23
 */
public interface EsPersonRepository extends ElasticsearchRepository<Person, Long> {
}

2.3 配置elasticsearchItemWriter

package com.hfcsbc.esetl.itemWriter;
import com.hfcsbc.esetl.repository.es.EsPersonRepository;
import com.hfcsbc.esetl.domain.Person;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.ItemWriteListener;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.StepExecutionListener;
import org.springframework.batch.item.ItemWriter;
import java.util.List;
/**
 * Create by pengchao on 2018/2/23
 */
public class ElasticsearchItemWriter implements ItemWriter<Person>, ItemWriteListener<Person>, StepExecutionListener {

  private EsPersonRepository personRepository;

  public ElasticsearchItemWriter(EsPersonRepository personRepository) {
    this.personRepository = personRepository;
  }

  @Override
  public void beforeWrite(List<? extends Person> items) {

  }

  @Override
  public void afterWrite(List<? extends Person> items) {

  }

  @Override
  public void onWriteError(Exception exception, List<? extends Person> items) {

  }

  @Override
  public void beforeStep(StepExecution stepExecution) {

  }

  @Override
  public ExitStatus afterStep(StepExecution stepExecution) {
    return null;
  }

  @Override
  public void write(List<? extends Person> items) throws Exception {
    //實現類AbstractElasticsearchRepository的saveAll方法調用的是elasticsearchOperations.bulkIndex(queries)，為批量索引
    personRepository.saveAll(items);
  }
}

2.4 配置ElasticsearchItemReader(本示例未使用，僅供參考)

package com.hfcsbc.esetl.itemReader;
import org.springframework.batch.item.data.AbstractPaginatedDataItemReader;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.query.SearchQuery;
import java.util.Iterator;
/**
 * Create by pengchao on 2018/2/24
 */
public class ElasticsearchItemReader<Person> extends AbstractPaginatedDataItemReader<Person> implements InitializingBean {

  private final ElasticsearchOperations elasticsearchOperations;

  private final SearchQuery query;

  private final Class<? extends Person> targetType;

  public ElasticsearchItemReader(ElasticsearchOperations elasticsearchOperations, SearchQuery query, Class<? extends Person> targetType) {
    this.elasticsearchOperations = elasticsearchOperations;
    this.query = query;
    this.targetType = targetType;
  }

  @Override
  protected Iterator<Person> doPageRead() {
    return (Iterator<Person>)elasticsearchOperations.queryForList(query, targetType).iterator();
  }

  @Override
  public void afterPropertiesSet() throws Exception {
  }
}

2.5 配置spring batch需要的配置

package com.hfcsbc.esetl.config;
import com.hfcsbc.esetl.itemWriter.ElasticsearchItemWriter;
import com.hfcsbc.esetl.repository.es.EsPersonRepository;
import com.hfcsbc.esetl.domain.Person;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.launch.support.RunIdIncrementer;
import org.springframework.batch.core.repository.JobRepository;
import org.springframework.batch.core.repository.support.JobRepositoryFactoryBean;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.database.JpaPagingItemReader;
import org.springframework.batch.item.database.orm.JpaNativeQueryProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.PlatformTransactionManager;
import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
/**
 * Create by pengchao on 2018/2/23
 */
@Configuration
@EnableBatchProcessing
public class BatchConfig {
  @Autowired
  private EsPersonRepository personRepository;

  @Bean
  public ItemReader<Person> orderItemReader(EntityManagerFactory entityManagerFactory){
    JpaPagingItemReader<Person> reader = new JpaPagingItemReader<Person>();
    String sqlQuery = "select * from person";
    try {
      JpaNativeQueryProvider<Person> queryProvider = new JpaNativeQueryProvider<Person>();
      queryProvider.setSqlQuery(sqlQuery);
      queryProvider.setEntityClass(Person.class);
      queryProvider.afterPropertiesSet();
      reader.setEntityManagerFactory(entityManagerFactory);
      reader.setPageSize(10000);
      reader.setQueryProvider(queryProvider);
      reader.afterPropertiesSet();
      reader.setSaveState(true);
    } catch (Exception e) {
      e.printStackTrace();
    }

    return reader;
  }

  @Bean
  public ElasticsearchItemWriter itemWriter(){
    return new ElasticsearchItemWriter(personRepository);
  }

  @Bean
  public Step step(StepBuilderFactory stepBuilderFactory,
           ItemReader itemReader,
           ItemWriter itemWriter){
    return stepBuilderFactory
        .get("step1")
        .chunk(10000)
        .reader(itemReader)
        .writer(itemWriter)
        .build();
  }

  @Bean
  public Job job(JobBuilderFactory jobBuilderFactory, Step step){
    return jobBuilderFactory
        .get("importJob")
        .incrementer(new RunIdIncrementer())
        .flow(step)
        .end()
        .build();
  }

  /**
   * spring batch執行時會創建一些自身需要的表，這里指定表創建的位置：dataSource
   * @param dataSource
   * @param manager
   * @return
   */
  @Bean
  public JobRepository jobRepository(DataSource dataSource, PlatformTransactionManager manager){
    JobRepositoryFactoryBean jobRepositoryFactoryBean = new JobRepositoryFactoryBean();
    jobRepositoryFactoryBean.setDataSource(dataSource);
    jobRepositoryFactoryBean.setTransactionManager(manager);
    jobRepositoryFactoryBean.setDatabaseType("postgres");
    try {
      return jobRepositoryFactoryBean.getObject();
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }
}

2.6配置數據庫及es的連接地址

spring:
 redis:
  host: 192.168.1.222
 data:
  jest:
   uri: http://192.168.1.222:9200
   username: elastic
   password: changeme

 jpa:
  database: POSTGRESQL
  show-sql: true
  hibernate:
   ddl-auto: update

 datasource:
  platform: postgres
  url: jdbc:postgresql://192.168.1.222:5433/person
  username: hfcb
  password: hfcb
  driver-class-name: org.postgresql.Driver
  max-active: 2

spring.batch.initialize-schema: always

2.7 配置入口類

package com.hfcsbc.esetl;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration;
import org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@SpringBootApplication(exclude = {ElasticsearchAutoConfiguration.class, ElasticsearchDataAutoConfiguration.class})
@EnableElasticsearchRepositories(basePackages = "com.hfcsbc.esetl.repository")
@EnableJpaRepositories(basePackages = "com.hfcsbc.esetl.repository.jpa")
public class EsEtlApplication {

  public static void main(String[] args) {
    SpringApplication.run(EsEtlApplication.class, args);
  }
}

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