GAE实例正在不同的网址上投放 [英] GAE instance is serving on different url

问题描述

我的Google应用引擎实例在默认的网址上投放的网址不同。最近，我将一个GAE项目上传到新创建的代码 foo-backend 的实例中。

在看到服务日志时，它显示

 > /_ah/spi/BackendService.getApiConfigs 
保存;键：__appstats __：031500，部分：57字节，完整：1452字节，开销：0.000 + 0.003;链接：http://1-dot-foo-backend.appspot.com/_ah/stats/details?time=1479812131572 
  

你看，服务网址是 http://1-dot-foo-backend.appspot.com 而不是 http： //foo-backend.appspot.com 。我想改变这个..任何想法？

解决方案

在您的 app.yaml 你有版本：1 。

为了看看这里发生了什么，以下情形：您的应用程序的版本n已部署，并且前端队列为后端工作。您部署版本n + 1并将其设为默认值。但是你在前端和后端之间做了协调一致的改变。如果n + 1版本的后端接收到由前端版本n排队的工作，现在会发生什么情况？根据变化，这可能会导致混乱。

唯一安全的做法是安排由版本n前端排队的工作由版本处理n后端，直到所有版本的n工作都耗尽。同时，由版本n + 1前端处理的工作由版本n + 1后端处理。这是如何保证的？通过在工作在URL中排队时对默认版本进行编码。

My google app engine instance is serving on different url than the default's one. Recently I uploaded an GAE project to the newly created instance of code foo-backend.

On seeing the serving logs, it shows

> /_ah/spi/BackendService.getApiConfigs
Saved; key: __appstats__:031500, part: 57 bytes, full: 1452 bytes, overhead: 0.000 + 0.003; link: http://1-dot-foo-backend.appspot.com/_ah/stats/details?time=1479812131572

You see, serving url is http://1-dot-foo-backend.appspot.com instead of http://foo-backend.appspot.com. I want to change this.. Any idea?

解决方案

In your app.yaml you have version: 1.

To see the 'why' of what's going on here, consider the following scenario: You have version n of your app deployed, with the front-end queuing work for the back-end. You deploy version n+1 and make it the default. But you made a coordinated change between front-ends and back-ends. What now happens if work queued by front-end version n is received by a version n+1 backend? Depending on the change, it might cause mayhem.

The only safe thing to do is to arrange for work queued by a version n front-end to be handled by a version n back-end until all version n work is drained. Meanwhile work queued by a version n+1 front-end get handled by a version n+1 backend. How does this be guaranteed? By encoding the default version at the time the work is queued in the URL.

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