如何配置Spring Boot和AWS Keyspaces的一致性级别?

Question

我希望你能帮助我，我正在做一个与spring启动和键空间(cassandra aws)的crud, spring在ONE中具有默认的一致性级别，我无法写入数据，因为我得到以下错误:

"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几种解决方案，但都不适合我。

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

有几种配置一致性级别的方法。您可以使用以下命令在application.conf文件中定义默认一致性:

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

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

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

您也可以使用@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

下面是一个Spring Boot和Amazon Keyspaces的例子

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);

}

}