我在一个云函数里有大量的数据要插入，由于插入数据库时有request body大小的限制，所以我做了一个循环让数据能够分批插入，但是每次云函数都报错，不太明白报错信息都含义。

  const MAXPAYLOAD = 2000000;
  let pList = [];
  let totalSize = JSON.stringify(vals).length;
  if (totalSize < MAXPAYLOAD) {
    pList.push(db.collection("testCollection").add({
      data:vals
    }));
  } else {
    let percent = Math.floor(MAXPAYLOAD/totalSize*100);
    let i = 0; 
    while (i < vals.length) {
      var batchSize = Math.floor(vals.length*percent/100);
      var tempList = vals.slice(i, batchSize);
      var checkLength = JSON.stringify(tempList).length;
      while (checkLength > MAXPAYLOAD) {
        batchSize = Math.floor(batchSize * percent / 100);
        tempList = vals.slice(i, batchSize);
        checkLength = JSON.stringify(tempList).length;
      }
      tempList = vals.slice(i, batchSize);
      i += batchSize;
      console.log(batchSize);
      pList.push(db.collection("testCollenction").add({
        data:tempList
      }));
    }
  } 
  console.log(pList.length);
  let res = await Promise.all(pList);

报错信息如下：