when br restored 3000k regions data, tikv regions distributed unevenly

[AkiraXie]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

cluster setup:

1. tidb cluster: 1 tidb 8U 16G; 1 pd 16C 32G; 15 tikv 8C 32G
2. br: 8U 16G

step:

br restores 3000k regions data to tidb cluster

2. What did you expect to see? (Required)

1. br restored successfully
2. tikv regions distributed evenly

3. What did you see instead (Required)

1. br restored successfully
2. tikv regions distributed unevenly , and ratio was 30%
   

4. What is your TiDB version? (Required)

tidb version:
v5.4.1
br version:
v5.4.1

[AkiraXie]

/component br

[AkiraXie]

/label affect-5.4

[ti-chi-bot]

@AkiraXie: The label(s) affect-5.4 cannot be applied. These labels are supported: challenge-program, compatibility-breaker, first-time-contributor, contribution, require-LGT3, good first issue, correctness, duplicate, proposal, security, needs-more-info, needs-cherry-pick-4.0, needs-cherry-pick-5.0, needs-cherry-pick-5.1, needs-cherry-pick-5.2, needs-cherry-pick-5.3, needs-cherry-pick-5.4, needs-cherry-pick-6.0, needs-cherry-pick-6.1, needs-cherry-pick-6.2, affects-4.0, affects-5.0, affects-5.1, affects-5.2, affects-5.3, affects-5.4, affects-6.0, affects-6.1, affects-6.2, may-affects-4.0, may-affects-5.0, may-affects-5.1, may-affects-5.2, may-affects-5.3, may-affects-5.4, may-affects-6.0, may-affects-6.1, may-affects-6.2.

In response to this:

/label affect-5.4

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[AkiraXie]

/label affects-5.4

[AkiraXie]

/severity major