data_prep/importfunc/generate_user_id_map.go

package importfunc

import (
	"bufio"
	"fmt"
	"math/rand"
	"os"
)

func GenerateUserIdMap() {

	list := make([]int64, 0)
	for i := int64(1000000); i < 10000000; i++ {
		list = append(list, i)
	}
	rand.Shuffle(9000000, func(i, j int) {
		list[i], list[j] = list[j], list[i]
	})

	pathurl := "/Users/Caeru/Desktop/file/user_id_map.txt"
	outfile, err := os.OpenFile(pathurl, os.O_WRONLY|os.O_CREATE, 0666)
	if err != nil {
		fmt.Printf("Open File Err : %v", err)
	}

	defer outfile.Close()

	writer := bufio.NewWriter(outfile)

	for i := range list {
		outfile.WriteString(fmt.Sprintf("%v:%v\n", 1000000+i, list[i]))
	}
	writer.Flush()
}