[close #231] TiKV-BR support v5.x.x

[haojinming]

Signed-off-by: haojinming jinming.hao@pingcap.com

What problem does this PR solve?

Issue Number: close #231

Problem Description: =

What is changed and how does it work?

Code changes

• Has exported function/method change

Check List for Tests

This PR has been tested by at least one of the following methods:

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Side effects

• No side effects

Related changes

• No related changes

[codecov]

Codecov Report

Merging #282 (45b6f8d) into main (c4c08d6) will decrease coverage by 0.0878%.
The diff coverage is 12.3188%.

❗ Current head 45b6f8d differs from pull request most recent head 81bb104. Consider uploading reports for the commit 81bb104 to get more accurate results

Additional details and impacted files

@@               Coverage Diff                @@
##               main       #282        +/-   ##
================================================
- Coverage   54.4448%   54.3570%   -0.0879%     
================================================
  Files           238        239         +1     
  Lines         20237      20312        +75     
================================================
+ Hits          11018      11041        +23     
- Misses         8341       8393        +52     
  Partials        878        878                

Flag	Coverage Δ		*Carryforward flag
br	39.4736% <20.4819%> (-0.0624%)	⬇️
cdc	61.2383% <0.0000%> (-0.0693%)	⬇️	Carriedforward from 80f7a2d

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
br/cmd/br/debug.go	26.9841% <0.0000%> (-1.0379%)	⬇️
br/pkg/backup/push.go	32.5581% <0.0000%> (-3.5764%)	⬇️
br/pkg/task/backup_raw.go	0.0000% <0.0000%> (ø)
br/pkg/task/restore_raw.go	0.0000% <0.0000%> (ø)
br/pkg/version/version.go	82.9268% <ø> (ø)
cdc/cdc/capture/capture.go	0.0000% <0.0000%> (ø)
cdc/cdc/capture/http_handler.go	0.0000% <0.0000%> (ø)
cdc/cdc/server.go	36.0189% <0.0000%> (ø)
br/pkg/feature/feature_gate.go	100.0000% <100.0000%> (ø)
br/pkg/pdutil/pd.go	40.2777% <100.0000%> (+0.3336%)	⬆️
... and 13 more

[pingyu]

Have we verified that the failpoint is effective ? This failpoint should cause an incomplete range and enter procedure fineGrainedBackup. I remember that there was a message "start fine grained backup" in log printed here, but I can't find it in CI logs.

[haojinming]

It seems be an issue. Now it works, see following:

[pingyu]

This change will change the original behavior, as all regions will fail, other than only one of them. In real scenarios, there should be only a small number of regions will fail.

I think we can change FAILPOINTS of rawkv test from return("region error") to 1*return("region error") to control how many times the failpoint takes effective.
Refer to here (this change add a "one region fail" case in addition to "all regions").

[haojinming]

Done, thanks.

[zeminzhou]

LGTM～

[pingyu]

Rest LGTM.

[pingyu]

Nit: add a space before ?= and align other lines.

[haojinming]

Done

[pingyu]

LGTM~

[haojinming]

/verify

[pingyu]

Force merge. Fix cdc integrated tests in another PR.
See the log:
https://ci.pingcap.net/blue/organizations/jenkins/common-check/detail/common-check/112025/pipeline/