我正在尝试使用spring向cassandra插入1500条记录。我有一个pojo列表，其中保存着这1500条记录，当我调用saveall或insert处理这些数据时，完成这个操作需要30秒。有人能给我建议一个更快完成这件事的方法吗？我目前正在运行cassandra3.11.2作为一个单节点测试集群。
实体pojo：

package com.samplepoc.pojo;

import static org.springframework.data.cassandra.core.cql.PrimaryKeyType.PARTITIONED;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import org.springframework.data.cassandra.core.mapping.Column;
import org.springframework.data.cassandra.core.mapping.PrimaryKeyColumn;
import org.springframework.data.cassandra.core.mapping.Table;

@Table("health")
public class POJOHealth
{
    @PrimaryKeyColumn(type=PARTITIONED)
    UUID primkey;
    @Column
    String col1;
    @Column
    String col2;
    @Column
    String col3;
    @Column
    String col4;
    @Column
    String col5;
    @Column
    Date ts;
    @Column
    boolean stale;
    @Column
    String col6;
    @Column
    String col7;
    @Column
    String col8;
    @Column
    String col9;
    @Column
    Map<String,String> data_map = new HashMap<String,String>();

    public POJOHealth(
             String col1,
             String col2,
             String col3,
             String col4,
             String col5,
             String col6,
             String col7,
             String col8,
             String col9,
             boolean stale,
             Date ts,
             Map<String,String> data_map
             )
    {
        this.primkey = UUID.randomUUID();
        this.col1=col1;
        this.col2=col2;
        this.col3=col3;
        this.col4=col4;
        this.col5=col5;
        this.col6=col6;
        this.col7=col7;
        this.col8=col8;
        this.col9=col9;
        this.ts=ts;
        this.data_map = data_map;
        this.stale=stale;
    }

    //getters & setter ommitted
}

持久化服务代码段：

public void persist(List<POJO> l_POJO)
{
        System.out.println("Enter Persist: "+new java.util.Date());

        List<l_POJO> l_POJO_stale = repository_name.findBycol1AndStale("sample",false);
        System.out.println("Retrieve Old: "+new java.util.Date());

        l_POJO_stale.forEach(s -> s.setStale(true));
        System.out.println("Set Stale: "+new java.util.Date());

        repository_name.saveAll(l_POJO_stale);
        System.out.println("Save stale: "+new java.util.Date());

        try 
        {
            repository_name.insert(l_POJO);
        } 
        catch (Exception e) 
        {
            System.out.println("Error in persisting new data");
        }
        System.out.println("Insert complete: "+new java.util.Date());
}