tikv:move split region request to pd

[qidi1]

Signed-off-by: qidi1 1083369179@qq.com

What problem does this PR solve?

Issue Number: tikv/pd/issues/4095
Proposal PR: pingcap/tidb/pull/33664
The original region split and scatter are handled by tikv and pd respectively, in order to improve efficiency, the split is also changed to be handled and controlled by PD.

What is changed and how it works?

In SplitRegions function,Using split api provide by PD instead of TiKV

Code changes based on this work
Thanks to hzh0435

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has configuration change
• Has HTTP API interfaces change (Don't forget to add the declarative for API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

[disksing]

would you like to explain why do you want to move it to using PD?

[qidi1]

would you like to explain why do you want to move it to using PD?

we are working in this issue,In Tikv,In tikv, it does not have the ability to check the current condition of the region, leading to the problem of unstable splitting. We move it to pd which having the global state of the region will reduce the probability of the problem in the above issue

[qidi1]

would you like to explain why do you want to move it to using PD?

I updated the description of the PR,PTAL

[disksing]

It seems that the integration tests (run with tikv) are failed.

[qidi1]

Sorry, I can't run integration tests locally，Because the tidb package is not available to me

[qidi1]

Sorry, I can't run integration tests locally，Because the tidb package is not available to me

I change pd.RegionSplit like tikv.RegionSplit,please try to run it

[disksing]

Hi @qidi1 , would like to fix the lint warnings? (some of them can be fixed by merging master)

[disksing]

Hi, it is nearly mergable! but there is still a lint warning:

Error: S1011: should replace loop with `regionIDs = append(regionIDs, resp.RegionsId...)` (gosimple)

[qidi1]

Hi, it is nearly mergable! but there is still a lint warning:

Error: S1011: should replace loop with `regionIDs = append(regionIDs, resp.RegionsId...)` (gosimple)

OK, I have changed

[disksing]

Thanks @qidi1