Firebase:第一次写入很慢 [英] Firebase: First write is slow

问题描述

当前正在开发使用离子技术的混合移动应用程序.当应用启动时，并且用户首次写入实时数据库，它总是会延迟大约10秒钟或更长时间.但是随后的所有写入几乎都是瞬时的(不到1秒).

Currently developing a hybrid mobile app using ionic. When the app starts up, and a user writes to the Realtime Database for the first time, it's always delayed by around 10 or more seconds. But any subsequent writes are almost instantaneous (less than 1 second).

我的延迟计算基于在Firebase控制台中查看数据库.

My calculation of delay is based on watching the database in the Firebase console.

这是一个已知问题，还是我做错了什么.请分享您的看法.

Is this a known issue, or maybe I am doing something wrong. Please share your views.

写入操作是通过Firebase Cloud Function进行的.

The write is happening via Firebase Cloud Function.

这是对Firebase Cloud函数的调用

This is the call to the Firebase Cloud function

this.http.post(url+"/favouritesAndNotes", obj, this.httpOptions)
  .subscribe((data) => {
    console.log(data);
  },(error)=>{
    console.log(error);
  });

这是实际功能

 app.post('/favouritesAndNotes', (request, response) => {
  var db = admin.database().ref("users/" + request.body.uid);
  var favourites = request.body.favourites;
  var notes = request.body.notes;
  if(favourites!==undefined){
    db.child("favourites/").set(favourites);
  }
  if(notes!==undefined){
    db.child("notes/").set(notes);
  }
  console.log("Write successfull");
  response.status(200).end();
});

推荐答案

首次在客户端实例中与Firebase数据库进行交互时，客户端/SDK必须做一些事情:

The first time you interact with the Firebase Database in a client instance, the client/SDK has to do quite some things:

1. 如果您使用的是身份验证，则需要检查其所拥有的令牌是否仍然有效，如果没有，请刷新它.
2. 它需要找到数据库当前所在的服务器.
3. 它需要建立一个Web套接字连接.

其中的每一个都可能需要多次往返，因此，即使您离服务器只有几百毫秒的路程，它的总和也会增加.

Each of these may take multiple round trips, so even if you're a few hundred ms from the servers, it adds up.

来自同一客户端的后续操作不必执行这些步骤，因此会更快.

Subsequent operations from the same client don't have to perform these steps, so are going to be much faster.

如果您想查看实际情况，建议您查看浏览器的网络"选项卡.对于实时数据库，我建议检查网络"选项卡的"WS/Web套接字"面板，您可以在其中查看实际的数据帧.

If you want to see what's actually happening, I recommend checking the Network tab of your browser. For the realtime database specifically, I recommend checking the WS/Web Socket panel of the Network tab, where you can see the actual data frames.

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