func write_in_batches(data []string, client *client.Client, size int, db string, wg *sync.WaitGroup) {
start := time.Now()
n := len(data)
for index := 0; index < n; {
end := index + size
if end >= n {
end = n - 1
}
txt := strings.Join(data[index:end], "\n")
_, err := client.WriteLineProtocol(txt, db, "", "", "")
if err != nil {
panic(err)
}
index = index + size
}
seelog.Infof("Write done in %s", time.Since(start))
wg.Done()
}