Question

要下载为csv文件，我不知道这是什么问题，当用户有40,000条记录时，当我试图打入api（80,000条记录）时，它的显示过程内存不足，它的工作正常。请帮助我解决这个问题

  app.get('/excelData', function (req, result) {
 var fields = ['firstName','lastName','catalina_cardStatus','deviceType','appVerison','phoneNumber','emailAddress','language','state','lastLogin','dateOfBirth']
 var data = [];
   var status = true;
   User.find({accountType:'user',isDeleted: {$ne:{status}}}).sort({created: -1}).exec((err, res) => {
     var resultData = [];
         var len = res.length;
         res.map((user,key) =>{
       var resData = {};
       if(user) {
         resData.firstName = user.firstName;
         resData.lastName = user.lastName;
         resData.catalina_cardStatus = user.catalina_cardStatus;
         resData.language = user.language;
         resData.phoneNumber = user.phoneNumber;
         resData.deviceType = user.deviceType;
         resData.appVerison = user.appVerison;
         resData.emailAddress = user.emailAddress;
         resData.state = user.state;
         resData.dateOfBirth = user.dateOfBirth;
         if(user.lastLogin){
           var date = new Date(user.lastLogin);
           var utcDate = new Date(date.toISOString());
           var utc = utcDate.setHours(utcDate.getHours()-8);
           var usDate = utc;
             var time = moment(utc).format("DD-MM-YYYY");
             resData.lastLogin = time;
         }
 }
          resultData.push(resData);
          len--;
          if(len==0){
                var csv = json2csv({ data:resultData , fields: fields });
                fs.writeFile('path', csv, function(err,data) {
                  setTimeout(function () {
                      fs.unlinkSync('path'.csv');
                    }, 30000);
                    result.send({msg: "saved sucessfully",path :'path.csv'});
                  if (err)
                  {
                    throw err;
                    console.log("Error: "+err);
                  }
                })
          }

     })
 })

 });

Answer 1

当为执行应用程序分配的内存小于运行应用程序时所需的内存时，会发生此错误。

默认情况下，Node.js中的内存限制为512 mb，要解决此问题，您需要增加使用命令—- max-old-space-size的内存限制。可以避免内存限制问题。

node --max-old-space-size=1024 index.js #increase to 1gb
node --max-old-space-size=2048 index.js #increase to 2gb
node --max-old-space-size=3072 index.js #increase to 3gb
node --max-old-space-size=4096 index.js #increase to 4gb
node --max-old-space-size=5120 index.js #increase to 5gb
node --max-old-space-size=6144 index.js #increase to 6gb
node --max-old-space-size=7168 index.js #increase to 7gb
node --max-old-space-size=8192 index.js #increase to 8gb

严重错误：CALL_AND_RETRY_LAST分配失败-进程内存不足

1 个答案: