Enhance-Split-Table-Stability

[hzh0425]

Description

Currently, the split table(regions) in tidb is constructed by following 2 steps:

1. Notify tikv to split regions
2. Notify pd to scatter regions

But this will let the time cost for the whole splitting table become unstable and rather time-consuming.

So we want to split and scatter regions in pd directly, that means I should add new method : SplitAndScatterRegions()

Tidb can directly send a splitAndScatterRegions instruction to PD, and deliver PD to split and scatter without sending two requests (split first and then scatter)

Tasks

• Discussion PR: Enhance Split Table Stability and Usability tikv/pd#4095

• Detail design : docs: add the design of Enhance Split Table Stability and Usability #29036

• kvproto : Add splitAndScatterRegions method in pdpb.proto add splitAndScatterRegions in pdpb.proto kvproto#826

• PD : Implement splitAndScatterRegions in grpc_service, client/client.go grpc-service: Add_split_and_scatter_region tikv/pd#4333

• client-go: Add SplitAndScatterRegions in tikv/split-regions.go add splitAndScatterRegions in split_region.go tikv/client-go#343

• tidb : Use SplitAndScatterRegions in executor/split.go executor: use splitAndScatterRegions #28989

Mentor

• @Yisaer

Recommended Skills

• go

[nolouch]

ref tikv/pd#6426