pdutil(ticdc): split tidb_ddl_job table (#6673)

[ti-chi-bot]

This is an automated cherry-pick of #6673

What problem does this PR solve?

Issue Number: close #4756

What is changed and how it works?

Split the table tidb_ddl_job.

Check List

Tests

• Unit test
• Manual test

Logs from PD leader.

[2022/08/09 08:33:44.514 +00:00] [INFO] [operator_controller.go:450] ["add operator"] [region-id=8978001] [operator="\"labeler-split-region {split: region 8978001 use policy USEKEY and keys [748000FFFFFFFFFFFFFE00000000000000F8 748000FFFFFFFFFFFFFF00000000000000F8]} (kind:split, region:8978001(4850, 5), createAt:2022-08-09 08:33:44.512985722 +0000 UTC m=+1131983.134539904, startAt:0001-01-01 00:00:00 +0000 UTC, currentStep:0, size:2, steps:[split region with policy USEKEY])\""] [additional-info="{\"region-end-key\":\"\",\"region-start-key\":\"7480000000000003FF5F5F728000000000FF436EF30000000000FA\"}"]
[2022/08/09 08:33:44.516 +00:00] [INFO] [operator_controller.go:652] ["send schedule command"] [region-id=8978001] [step="split region with policy USEKEY"] [source=create]
[2022/08/09 08:33:44.519 +00:00] [INFO] [cluster_worker.go:139] ["alloc ids for region split"] [region-id=10365001] [peer-ids="[10365002,10365003,10365004]"]
[2022/08/09 08:33:44.519 +00:00] [INFO] [cluster_worker.go:139] ["alloc ids for region split"] [region-id=10365005] [peer-ids="[10365006,10365007,10365008]"]
[2022/08/09 08:33:44.524 +00:00] [INFO] [region.go:580] ["region Version changed"] [region-id=8978001] [detail="StartKey Changed:{7480000000000003FF5F5F728000000000FF436EF30000000000FA} -> {748000FFFFFFFFFFFFFF00000000000000F8}, EndKey:{}"] [old-version=4850] [new-version=4852]
[2022/08/09 08:33:44.527 +00:00] [INFO] [operator_controller.go:566] ["operator finish"] [region-id=8978001] [takes=11.372527ms] [operator="\"labeler-split-region {split: region 8978001 use policy USEKEY and keys [748000FFFFFFFFFFFFFE00000000000000F8 748000FFFFFFFFFFFFFF00000000000000F8]} (kind:split, region:8978001(4850, 5), createAt:2022-08-09 08:33:44.512985722 +0000 UTC m=+1131983.134539904, startAt:2022-08-09 08:33:44.516296175 +0000 UTC m=+1131983.137850403, currentStep:1, size:2, steps:[split region with policy USEKEY]) finished\""] [additional-info="{\"region-end-key\":\"\",\"region-start-key\":\"7480000000000003FF5F5F728000000000FF436EF30000000000FA\"}"]
[2022/08/09 08:33:44.526 +00:00] [INFO] [cluster_worker.go:231] ["region batch split, generate new regions"] [region-id=8978001] [origin="id:10365001 start_key:\"7480000000000003FF5F5F728000000000FF436EF30000000000FA\" end_key:\"748000FFFFFFFFFFFFFE00000000000000F8\" region_epoch:<conf_ver:5 version:4852 > peers:<id:10365002 store_id:1 > peers:<id:10365003 store_id:4 > peers:<id:10365004 store_id:5 > id:10365005 start_key:\"748000FFFFFFFFFFFFFE00000000000000F8\" end_key:\"748000FFFFFFFFFFFFFF00000000000000F8\" region_epoch:<conf_ver:5 version:4852 > peers:<id:10365006 store_id:1 > peers:<id:10365007 store_id:4 > peers:<id:10365008 store_id:5 >"] [total=2]

$ pd-ctl region 10365001
{
  "id": 10365001,
  "start_key": "7480000000000003FF5F5F728000000000FF436EF30000000000FA",
  "end_key": "748000FFFFFFFFFFFFFE00000000000000F8",
  "epoch": {
    "conf_ver": 5,
    "version": 4852
  },
  "peers": [
    {
      "id": 10365002,
      "store_id": 1,
      "role_name": "Voter"
    },
    {
      "id": 10365003,
      "store_id": 4,
      "role_name": "Voter"
    },
    {
      "id": 10365004,
      "store_id": 5,
      "role_name": "Voter"
    }
  ],
  "leader": {
    "id": 10365002,
    "store_id": 1,
    "role_name": "Voter"
  },
  "written_bytes": 0,
  "read_bytes": 0,
  "written_keys": 0,
  "read_keys": 0,
  "approximate_size": 2,
  "approximate_keys": 10813
}

$ pd-ctl region 8978001
{
  "id": 8978001,
  "start_key": "748000FFFFFFFFFFFFFF00000000000000F8",
  "end_key": "",
  "epoch": {
    "conf_ver": 5,
    "version": 4852
  },
  "peers": [
    {
      "id": 8978002,
      "store_id": 1,
      "role_name": "Voter"
    },
    {
      "id": 8978003,
      "store_id": 4,
      "role_name": "Voter"
    },
    {
      "id": 8978004,
      "store_id": 5,
      "role_name": "Voter"
    }
  ],
  "leader": {
    "id": 8978002,
    "store_id": 1,
    "role_name": "Voter"
  },
  "written_bytes": 362,
  "read_bytes": 0,
  "written_keys": 6,
  "read_keys": 0,
  "approximate_size": 1,
  "approximate_keys": 0
}

Questions

Will it cause performance regression or break compatibility?

No.

Do you need to update user documentation, design documentation or monitoring documentation?

No.

Release note

None

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