The difference between region-schedule-limit and leader-schedule-limit

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Original topic: region-schedule-limit和leader-schedule-limit的区别

| username: andone

The difference between region-schedule-limit and leader-schedule-limit in PD

Does region-schedule-limit include both leader nodes and follower nodes?

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| username: andone | Original post link

I hope the expert can clear up my confusion. :pray:

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| username: 小龙虾爱大龙虾 | Original post link

The leader-schedule-limit can control the number of leader scheduling tasks being executed simultaneously. The region-schedule-limit can control the number of Region scheduling tasks being executed simultaneously. The operators generated by the scheduler may contain multiple operations. These two limits restrict the overall scheduling speed from different perspectives of leader and region. Leader scheduling does not involve data movement, while region scheduling involves data movement.

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| username: h5n1 | Original post link

These two things limit the generation speed of operators on the PD side. The actual speed will also be limited by the store limit consumption speed on the TiKV side.

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| username: 魔人逗逗 | Original post link

The configuration in tikv/pd limits the concurrency during actual scheduling.

regionAllowed := s.OpController.OperatorCount(operator.OpRegion) < conf.GetRegionScheduleLimit()
leaderAllowed := s.OpController.OperatorCount(operator.OpLeader) < conf.GetLeaderScheduleLimit()
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| username: dba远航 | Original post link

The leader-schedule-limit can control the number of leader scheduling tasks that are performed simultaneously. The region-schedule-limit can control the number of Region scheduling tasks that are performed simultaneously. These parameters manage scheduling objects from two different perspectives.

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| username: system | Original post link

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