如何使用 Spring Boot 和 AWS Keyspaces 配置一致性级别？

Question

我希望你能帮助我，我正在用 spring boot 和 keyspaces (cassandra aws) 做一个 crud，spring 的 Consistency level 默认级别为 ONE，自从出现以下错误后我无法写入数据：

"message": "Query; CQL [INSERT INTO tabledemoach (address,ciiu,creation_date,email,id,name,phone,state,user_activation_status) VALUES (?,?,?,?,?,?,?,?,?)]; Consistency level LOCAL_ONE is not supported for this operation. Supported consistency levels are: LOCAL_QUORUM; nested exception is com.datastax.oss.driver.api.core.servererrors.InvalidQueryException: Consistency level LOCAL_ONE is not supported for this operation. Supported consistency levels are: LOCAL_QUORUM",

我不知道如何配置一致性级别，我在互联网上尝试了多种解决方案，但没有一个对我有用。

我有以下代码

@Configuration
@EnableCassandraRepositories(basePackages = "com.demo")
public class AppConfig {

private final static String KEYSPACE = "demo";

@Primary
public @Bean CqlSession session() {
    return CqlSession.builder().withKeyspace(KEYSPACE).build();
}

}


@Table(value = "tabledemoach")
@Data
public class User {

@PrimaryKey
private int id;
private String phone;
private String name;
private String address;
private String email;
private int ciiu;
private String state;
private String user_activation_status;
private LocalDate creation_date;
} 


    @Override
    public void createUser(User user) {
    List<User> userFind = (List<User>) userRepository.findAll();

    var userList =userFind.stream().map(x -> x.getPhone());
    var repeated = (userList.filter(x -> 
    x.contains(user.getPhone()))).collect(Collectors.toList());

    if(repeated.size() <= 0){
        userRepository.save(user);
    }
}

Answer 1

有几种方法可以配置一致性级别。您可以在 application.conf 文件中定义默认一致性：

datastax-java-driver {
  basic {
    request {
      consistency = LOCAL_QUORUM
    }
  }
}

您也可以在使用InsertOptions和UpdateOptions时配置它。例如：

InsertOptions insertOptions = 
    org.springframework.data.cassandra.core.InsertOptions.builder()
        .consistencyLevel(ConsistencyLevel.LOCAL_QUORUM)
        .build();

您还可以使用 @Consistency 注释，例如：

    @Consistency(ConsistencyLevel.LOCAL_QUORUM)
    List<Person> findByLastname(String lastname);

最后与QueryOptions：

QueryOptions queryOptions = 
    newQueryOptions.setConsistencyLevel(ConsistencyLevel.LOCAL_QUORUM);

Answer 2

这是 Spring Boot 和 Amazon Keyspaces 的示例

https://github.com/aws-samples/amazon-keyspaces-examples/tree/main/java/datastax-v4/spring

package com.example.demo;

import com.datastax.oss.driver.api.core.CqlSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.cql.CqlTemplate;
import org.springframework.data.cassandra.repository.config.EnableCassandraRepositories;


@SpringBootApplication
@EnableCassandraRepositories(basePackages="com.example.model")
public class DemoApplication implements CommandLineRunner {


    @Autowired
    private CassandraOperations cassandraTemplate;

    public static void main(String[] args) {

        SpringApplication.run(DemoApplication.class, args);

    }

    @Override
    public void run(String... args) throws Exception {

        CqlTemplate cqlTemplate = (CqlTemplate) cassandraTemplate.getCqlOperations();

        CqlSession session = cqlTemplate.getSession();

        int count = session.execute ("SELECT * FROM system.peers").all().size();

        System.out.println("Number of hosts: "+  count);

        
    }



}