PROSAGA码农传奇-ONOS/AWS Lambda/Kappa-AWS Lambda帐户并发，限制

<div class =“post-text”itemprop =“text”>
  <P>
    你所描述的一种保护形式的节流是完全可行的:)
而无需创建第二个
    <EM>
      虚函数
    </EM>
     如你所描述的那样
  </p>
  <P>
    Lambdas带来了
    <EM>
      保留并发
    </EM>
     限制，使您可以设置最大并发接受的lambdas数。如果请求数超过该限制，则溢出请求将收到错误500响应。
  </p>
  <P>
    要设置并发限制，您有以下几种选择：
  </p>
  <H2>
    控制台
  </H2>
  <P>
    在AWS控制台内导航到lambda，在配置页面中向下滚动到
    <EM>
      并发
    </EM>
     框，然后选择
    <EM>
      保留并发
    </EM>
     （输入您想要的号码50）
  </p>
  <P>
    <a href="https://i.stack.imgur.com/ps4HM.png" rel="nofollow noreferrer">
      <img src =“https://i.stack.imgur.com/ps4HM.png”alt =“在此处输入图片说明”/>
    </A>
  </p>
  <H2>
    命令行
  </H2>
  <P>
    要修改
    <EM>
      保留并发
    </EM>
     通过命令行使用以下内容
    <a href="https://docs.aws.amazon.com/lambda/latest/dg/concurrent-executions.html" rel="nofollow noreferrer">
      命令
    </A>
    ：
  </p>
   <pre>
    <code>
      aws lambda put-function-concurrency --function-name YOUR_FUNCTION_NAME_HERE --reserved-concurrent-executions 50

</code>
  </pre>
  <H2>
    无服务器框架文件
  </H2>
  <P>
    如果使用无服务器框架部署功能，则可以修改
    <EM>
      保留并发
    </EM>
     对于任何内部的lambda
     <code>
      function
    </code>
     你文件的一部分。
  </p>
   <pre>
    <code>
      service: stackoverflow # NOTE: update this with your service name

provider:
  name: aws
  runtime: python3.7
  stage: ${opt:stage, 'dev'}
  region: ${opt:region, 'us-east-1'}
  profile: ${opt:profile, 'default'}
  environment:
    region: ${self:provider.region}
    stage: ${self:provider.stage}
  stackTags:
    Owner : krapes
    Project : concurrencyLimits
    Service : concurrencyLimits
    Team : brokenLeg
  stackPolicy: # This policy allows updates to all resources
    - Effect: Allow
      Principal: "*"
      Action: "Update:*"
      Resource: "*"

iamRoleStatements:

functions:
  dummy:
    handler: dummy.main
    timeout: 10
    ## This parameter sets the reserved concurrency for the lambda 'dummy'
    reservedConcurrency: 50
#    events:
#      - http:
#          method: GET
#          path: /dummy
#          resp: json

#plugins:
#  - serverless-python-requirements

custom:
  pythonRequirements:
     dockerizePip: non-linux

</code>
  </pre>
  <P>
    现在，当
    <a href="https://aws.amazon.com/blogs/compute/managing-aws-lambda-function-concurrency/" rel="nofollow noreferrer">
      测试
    </A>
     你的lambda，你会看到的
    <EM>
      同
    </EM>
     该
    <EM>
      保留并发
    </EM>
     设置超额请求时返回错误500代码，从而保护系统。
  </p>

没有
  <EM>
    保留并发
  </EM>
   限制：

<pre>
    <code>
      Details (average, fastest, slowest):
  DNS+dialup:   0.0009 secs, 2.0200 secs, 6.0415 secs
  DNS-lookup:   0.0002 secs, 0.0000 secs, 0.0185 secs
  req write:    0.0000 secs, 0.0000 secs, 0.0030 secs
  resp wait:    3.5561 secs, 2.0199 secs, 6.0414 secs
  resp read:    0.0001 secs, 0.0000 secs, 0.0032 secs

Status code distribution:
  [200] 5000 responses

</code>
  </pre>

同
  <EM>
    保留并发
  </EM>
   限制：

<pre>
    <code>
      Details (average, fastest, slowest):
  DNS+dialup:   0.0007 secs, 0.0094 secs, 5.6580 secs
  DNS-lookup:   0.0000 secs, 0.0000 secs, 0.0119 secs
  req write:    0.0000 secs, 0.0000 secs, 0.0033 secs
  resp wait:    1.1845 secs, 0.0093 secs, 5.5826 secs
  resp read:    0.0000 secs, 0.0000 secs, 0.0032 secs

Status code distribution:
  [200] 1638 responses
  [500] 3362 responses

</code>
  </pre>
</DIV>