PCP: Support to pause a scheduler

[shafreeck]

PCP Issue

• difficult: easy
• score: 100
• min score required: 0
• Recommended Skills: Go, PD Schedulers

Description

Sometimes we want to pause a scheduler for debugging purposes. Add a command in pd-ctl to support to pause a scheduler for delay seconds. After the delay running out, the scheduler should recover to work again. Add another command to resume a paused scheduler which can be used if the user does not want to wait so long.

schedule pause <name> <delay>
schedule resume <name>

For example
> schedule pause balance-region-scheduler 10s // pause for 10s
> schedule pause all 10s // pause all scheduler for 10s
> schedule resume balance-region-scheduler // resume before 10s running out.

Requirements:

• No scheduler operator created during the pause.  
• The scheduler recover to work after the delay.

[hrbeuyz24]

/pick-up-challenge

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@hrbeuyz24 pick up issue success

[hrbeuyz24]

/pick-up-challenge

[sre-bot]

@hrbeuyz24 pick up issue success