Sled Experiment for watching the consumed disk_space

sled_experiment.rs

use sled;

fn main() {
    let db = sled::open("/path/to/sled").unwrap();
    //let db = sled::Config::default().temporary(true).open().unwrap();
    let tree = db.open_tree("events").unwrap();

    let mut cnt = 0_u64;
    let mut size = 0_u64;
    let mut last_id: Option<u64> = None;
    while cnt < 1_000_000_000 {
        let id = db.generate_id().unwrap();
        let write: [u8; 8] = unsafe { std::mem::transmute(id.to_be()) };

        let payload = vec![100; 10000];
        tree.insert(write, payload).unwrap();

        if let Some(last) = last_id {
            let last_key: [u8; 8] = unsafe { std::mem::transmute(last.to_be()) };
            tree.remove(last_key).unwrap();
        }
        last_id = Some(id);

        if cnt % 1_000 == 0 {
            let cur_size = db.size_on_disk().unwrap();
            if cnt % 1_000_000 == 0 {
                println!("{}", cur_size);
            }
            if cur_size < size {
                println!("db shrunk! From {} to {} bytes", size, cur_size);
            }
            size = cur_size;
        }
        cnt += 1;
    }