feat(autoscaling): support warm pools

[jungseoklee]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

Summary

This PR adds an interface to create a warm pool easily, which gives an ability to decrease latency for applications that have exceptionally long boot times: https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-warm-pools.html

Test

• Run unit test and integration test.

PASS test/warm-pool.test.js
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=============================== Coverage summary ===============================
Statements   : 93.22% ( 413/443 )
Branches     : 87% ( 288/331 )
Functions    : 93.39% ( 99/106 )
Lines        : 92.95% ( 396/426 )
================================================================================
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Verifying integ.warm-pool.js against integ.warm-pool.expected.json ... OK.
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Notes

• I borrowed description from AWS public doc for docstring.

[gitpod-io]

[jungseoklee]

Here are changes since the first revision:

• Added document link on hibernation prerequisites.
• Rebased on top of the latest HEAD of master branch.

[kaizencc]

Hi @jungseoklee, this looks like a good start. A few preliminary comments for my first iteration.

[jungseoklee]

Hi @jungseoklee, this looks like a good start. A few preliminary comments for my first iteration.

Thanks for all comments!

Pull request has been modified.

[jungseoklee]

The PR Linter failure is related to this commit. Could CDK maintainer check if the following regex is correct?

/^integ.*.ts$/

Do we need to change regex as below because of file path?

/integ.*.ts$/

[jungseoklee]

Here are changes since the second revision:

• Addressed comments from Kaizen.
• Rebased on top of the latest HEAD of master branch.

[kaizencc]

@jungseoklee This is almost good to go. I will update the defaults myself, but leave the conversation about minSize and poolState up for you to see/discuss.

Re: pr-linter, looks like we changed it already so it should be correct when we merge from master.

Pull request has been modified.

[kaizencc]

Thanks @jungseoklee!

[jungseoklee]

Thanks @jungseoklee!

Thanks for reviewing the PR, @kaizen3031593 !

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: a1b1628
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).