Question

我使用pubsub应用程序编写了一个简单的appEngine。查看appEngine日志时，我看到内存在不断增加和减少，并且一直在重复发生。当我看着日志。我收到以下错误消息。基本上我在做什么，我已经设置了一个cron任务，每分钟触发一次此路由，快速路由会将消息发布到pubsub。对于这个简单的任务，我看到内存使用量从89MB不断增加到131MB，并且在下一个即将到来的触发器中它将失败。请建议我如何解决此内存泄漏。

2018-07-22 10:51:00.266 IST
Exceeded soft private memory limit of 128 MB with 130 MB after servicing 9 requests total. Consider setting a larger instance class in app.yaml.
2018-07-22 10:51:00.266 IST
After handling this request, the process that handled this request was found to be using too much memory and was terminated. This is likely to cause a new process to be used for the next request to your application. If you see this message frequently, you may have a memory leak in your application or may be using an instance with insufficient memory. Consider setting a larger instance class in app.yaml.

下面是代码示例 index.js

const express = require('express');
const app = express();
const pubsub = require('./pubsub1.js');

app.get('/', (req, res) => {
  res.send('Hi!');
});

app.get('/hello', (req, res) => {
  var planet = req.query.planet || 'Earth';
  res.send(`Hello Planet ${planet}!`);
});

app.get('/helloAppengineFROMcron', (req, res) => {

  var message = req.query.date || 'no date';
  //res.status(200).send(`Hello ${name || 'World'}!`);
  res.send(`Hello from Express app, just triggered a pubsub messsage @ ${message}`);  
  console.log(`Hello from Express app, just triggered a pubsub messsage @ ${message}`);
  pubsub.publishMessage('helloPubsubFROMappengine', '--> appEngine');
});

//const server = app.listen(process.env.PORT || 8080, "localhost", () => {
const server = app.listen(process.env.PORT || 8080, () => {
  const host = server.address().address;
  const port = server.address().port;  
  console.log(`Express cron http://${host}:${port}`);
});

pubsub1.js

//Program : pubsub1.js
// Imports the Google Cloud client library
const PubSub = require(`@google-cloud/pubsub`);

function getCurrentISTdt(format){
    var cDT = new Date();
    var currentOffset = cDT.getTimezoneOffset();
    var ISTOffset = 330;   // IST offset UTC +5:30 
    var ISTTime = new Date(cDT.getTime() + (ISTOffset + currentOffset)*60000);

    var day = ISTTime.getDate() > 9 ? ISTTime.getDate() : '0'+ISTTime.getDate();
    var months = ["January","February","March","April","May","June","July","August","September","October","November","December"];
    var month = months[cDT.getMonth()];
    var mm = (ISTTime.getMonth()+1) > 9 ? (ISTTime.getMonth()+1) : '0'+(ISTTime.getMonth()+1); 
    var year = ISTTime.getFullYear();
    var h = ISTTime.getHours() > 9 ? ISTTime.getHours() : '0'+ISTTime.getHours();
    var m = ISTTime.getMinutes() > 9 ? ISTTime.getMinutes() : '0'+ISTTime.getMinutes();
    var s = ISTTime.getSeconds() > 9 ? ISTTime.getSeconds() : '0'+ISTTime.getSeconds();

    var cISTdt;
    if(format == "yyyymmdd"){
        cISTdt = year+''+mm+''+day;
    }else if(format == "yyyymm"){
        cISTdt = year+''+mm;
    }else if(format == "yyyy"){
        cISTdt = year;
    }else if(format == "yyyy-mmm-dd hh:mm:ss"){
        cISTdt = year+'-'+month+'-'+day+' '+h+':'+m+':'+s;
    }else if(format == "dd/mm/yyyy hh:mm:ss"){
        cISTdt = day+'/'+mm+'/'+year+' '+h+':'+m+':'+s;
    }
    else{
        cISTdt = year+'/'+mm+'/'+day+' '+h+':'+m+':'+s;
    }

    return cISTdt;    
}

function publishMessage(topicName, data) {
  // [START pubsub_publish]
  // [START pubsub_quickstart_publisher]

  // Creates a client
  const pubsub = new PubSub();

  /**
   * TODO(developer): Uncomment the following lines to run the sample.
   */
  // const topicName = 'your-topic';
  // const data = JSON.stringify({ foo: 'bar' });

  // Publishes the message as a string, e.g. "Hello, world!" or JSON.stringify(someObject)
  data = data?data:' missed appEngine data ';
  data = data + ' --> Pubsub';
  const dataBuffer = Buffer.from(data);

  pubsub
    .topic(topicName)
    .publisher()
    .publish(dataBuffer)
    .then(messageId => {
      console.log(`Message triggered from pubsub() @ ${getCurrentISTdt("yyyy-mmm-dd hh:mm:ss")} - ID:${messageId} published.`);
    })
    .catch(err => {
      console.error('ERROR:', err);
    });
  // [END pubsub_publish]
  // [END pubsub_quickstart_publisher]
}

//publishMessage('pubsubTest1', 'Helo Testing');

module.exports = {
    //functionName there : functionName here
    publishMessage,
    getCurrentISTdt
};

package.json

{
  "name": "gae-hello",
  "version": "1.0.0",
  "description": "HelloWorlds GAE",
  "main": "app.js",
  "scripts": {
    "start": "node app.js",
    "deploy": "gcloud app deploy --quiet",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "engines": {
    "node": "8.x.x"
  },  
  "keywords": [
    "express.js",
    "cron",
    "GAE",
    "appEngine"
  ],
  "author": "Sushanth Bobby Lloyds",
  "license": "ISC",
  "dependencies": {
    "@google-cloud/pubsub": "^0.19.0",
    "express": "^4.16.3"
  }
}

Answer 1

您可能没有遇到内存泄漏，但是可能受到可用内存的限制。

App Engine的默认实例类具有非常低的RAM（128Mo）。您可以尝试将即时通讯类至少增加到F2：

在您app.yaml中，添加以下内容：instance_class: F2（在the docs中了解更多信息）

GAE-Nodejs-一个简单的pubsub应用程序发生内存泄漏-超出了软私有内存限制

1 个答案: