AWS Lambda:识别冷启动 [英] AWS Lambda: Identifying cold starts

问题描述

是否有明确的方法来识别冷启动"?是在Lambda本身中还是在运行时中，还是通过日志?我知道冷启动的特点是运行时间更长，实际上我可以看到，但是我正在寻找一种清晰的方法. 如果那很重要，我正在使用Node.js.

Is there a clear way to identify "cold starts"? Either in runtime in the Lambda itself, or via the logs? I know that cold starts are characterized by longer runtimes, which I can actually see, but I'm looking for a clear cut way. I'm using Node.js if that matters.

更新:对于两个用例，下面有两个很好的答案: -在lambda运行时识别冷启动. -从CloudWatch日志中识别冷启动.

Update: There are two good answers below, for two use cases: - Identifying the cold start as the lambda runs. - Identifying the cold start from the CloudWatch log.

推荐答案

如果在NodeJS脚本的顶部添加一些初始化代码，则可以在代码中告诉您这是一个冷门，并且您将然后就可以记录下来，如果您想在日志中看到它.例如:

If you add some initialization code to the top of your NodeJS script, you will be able to tell in the code that it is a cold start, and you will then be able to log that if you want to see it in the logs. For example:

var coldStart = true;
console.log("This line of code exists outside the handler, and only executes on a cold start");


exports.myHandler = function(event, context, callback) {
  if (coldStart) {
    console.log("First time the handler was called since this function was deployed in this container");
  }
  coldStart = false;

   ...

  callback(...);
}

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