node js series VS parallel

js_series_vs_parallel.js

    // in Series
    const result = await rows.reduce((p, album, i) => p.then(async () => {
      var hotlink_url = '';
      try {
        hotlink_url = await Helper.getHotlink(album.post_url, browser);
        const r  = await pool.query(state, [ album.id, null, moment(new Date()) ]);
        return r.rows[0];
      } catch(e){
        console.log('erro ocorrido:', e);
      }
    }), Promise.resolve()); // reduce end
// --------------------------------------------------------    
    // in Parallel
    const result = await rows.map(async album => {
      var hotlink_url = '';
      try {
        hotlink_url = await Helper.getHotlink(album.post_url, browser);
        const r = await pool.query(state, [album.id, null, moment(new Date())]);
        return r.rows[0];
      } catch (e) {
        console.log('erro ocorrido:', e);
      }
    }); // map end