[GLCC] SidecarSet support pre-download image

[Hanmengnan]

Ⅰ. Describe what this PR does

Add the feature that SidecarSet support pre-download image.

The SidecarSet controller will automatically pre download your new version image on all nodes where the old version pod is located. It will be very helpful for accelerating application release.

The following situations will skip image pre downloading:

1. ignore if update type is NotUpdate
2. ignore if all Pods update in one batch

The parallelism of each new image pre-downloading by SidecarSet is 1, which means the image is downloaded on nodes one by one. You can change the parallelism using apps.kruise.io/image-predownload-parallelism annotation on SidecarSet according to the capability of image registry.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[kruise-bot]

Welcome @Hanmengnan! It looks like this is your first PR to openkruise/kruise 🎉

[codecov-commenter]

Codecov Report

Merging #1318 (b066b1b) into master (e6205a5) will decrease coverage by 0.25%.
The diff coverage is 19.87%.

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@@            Coverage Diff             @@
##           master    #1318      +/-   ##
==========================================
- Coverage   48.28%   48.04%   -0.25%     
==========================================
  Files         152      153       +1     
  Lines       21469    21619     +150     
==========================================
+ Hits        10366    10386      +20     
- Misses       9969    10093     +124     
- Partials     1134     1140       +6     

Flag	Coverage Δ
unittests	48.04% <19.87%> (-0.25%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...troller/sidecarset/sidecarset_predownload_image.go	11.92% <11.92%> (ø)
pkg/controller/sidecarset/sidecarset_controller.go	13.79% <14.28%> (-1.60%)	⬇️
pkg/controller/sidecarset/sidecarset_processor.go	66.13% <40.00%> (-1.95%)	⬇️

... and 5 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[zmberg]

#1221

[zmberg]

@Hanmengnan Can you join kruise dingding group to communicate with me?

[Hanmengnan]

@Hanmengnan Can you join kruise dingding group to communicate with me?

Sure, I have joined kruise dingding group, can you tell me your name in the groupso that I can contact you.

[zmberg]

@Hanmengnan Can you join kruise dingding group to communicate with me?

Sure, I have joined kruise dingding group, can you tell me your name in the groupso that I can contact you.

立衡

[cubxxw]

/lgtm

[kruise-bot]

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In response to this:

/lgtm

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[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Hanmengnan]

I have add the apps.kruise.io/image-predownload-min-updated-ready-pods to make sure the new image starting pre-download after a few new Pods have been updated ready.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.