Enable parallel apply

[rquitales]

To enable parallel apply, we can loop our apply logic in separate Go threads instead of a synchronous loop.

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[seans3]

/ok-to-test

[rquitales]

/retest

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[karlkfi]

Looks like a good start. Nice to see it passes tests.

I think we're gonna want to be able to limit the number of concurrent applies tho. There's a couple options discussed here: https://www.tegh.net/2020/04/29/semaphored-wait-group/

Then we're want to pipe that through the ApplyOptions with something like MaxConcurrentRequests.

And then we're gonna need a way to cancel the whole group, or at least cause each goroutine to cancel. I think we can do this by passing through the Context, which we've been meaning to do for a while. That can be done by adding the Context to the TaskContext. Then at the beginning of each go routine, we can check if the context is done to exit early. That way the WaitGroup will drain nicely when cancelled, effectively skipping unstarted goroutines.

Perhaps you can attempt the TaskContext.Context refactor first in a separate PR?

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@rquitales: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
cli-utils-presubmit-master-stress	6331a10c0c9494089b59ce1fdb82fc768cd42d84	link	true	/test cli-utils-presubmit-master-stress

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/lifecycle rotten

[karlkfi]

/remove-lifecycle rotten

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/lifecycle stale

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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