Abnormal output from "get regions by state"

[v01dstar]

Bug Report

What did you do?

Run get regions by state (pending peer) and get region by id commands while investigating #6559.

What did you expect to see?

Same region should have the same (or almost the same) info.

What did you see instead?

Inconsistent, and the output of get regions by state looks strange.

get regions by state's output comes from stats, while get region by id's output comes from "region info", the real question is probably why get regions by state is not up-to-date or wrong

Output of get regions by state

{
  "count": 3,
  "regions": [
    {
      "id": 55929554,
      "epoch": {
        "conf_ver": 6,
        "version": 109399
      },
      "peers": [
        {
          "id": 55929555,
          "store_id": 1,
          "role_name": "Voter"
        },
        {
          "id": 55929556,
          "store_id": 4,
          "role_name": "Voter"
        },
        {
          "id": 55929557,
          "store_id": 5,
          "role_name": "Voter"
        },
        {
          "id": 55929558,
          "store_id": 2751139,
          "role": 1,
          "role_name": "Learner",
          "is_learner": true
        }
      ],
      "leader": {
        "id": 55929555,
        "store_id": 1,
        "role_name": "Voter"
      },
      "pending_peers": [
        {
          "id": 55929556,
          "store_id": 4,
          "role_name": "Voter"
        },
        {
          "id": 55929557,
          "store_id": 5,
          "role_name": "Voter"
        },
        {
          "id": 55929558,
          "store_id": 2751139,
          "role": 1,
          "role_name": "Learner",
          "is_learner": true
        }
      ]
    },
    {
      "id": 638281173,
      "epoch": {
        "conf_ver": 6,
        "version": 109421
      },
      "peers": [
        {
          "id": 638281174,
          "store_id": 1,
          "role_name": "Voter"
        },
        {
          "id": 638281175,
          "store_id": 4,
          "role_name": "Voter"
        },
        {
          "id": 638281176,
          "store_id": 5,
          "role_name": "Voter"
        },
        {
          "id": 638281177,
          "store_id": 2751139,
          "role": 1,
          "role_name": "Learner",
          "is_learner": true
        }
      ],
      "leader": {
        "id": 638281176,
        "store_id": 5,
        "role_name": "Voter"
      },
      "pending_peers": [
        {
          "id": 638281174,
          "store_id": 1,
          "role_name": "Voter"
        },
        {
          "id": 638281175,
          "store_id": 4,
          "role_name": "Voter"
        },
        {
          "id": 638281177,
          "store_id": 2751139,
          "role": 1,
          "role_name": "Learner",
          "is_learner": true
        }
      ]
    },
    {
      "id": 614447770,
      "epoch": {
        "conf_ver": 6,
        "version": 109418
      },
      "peers": [
        {
          "id": 614447771,
          "store_id": 1,
          "role_name": "Voter"
        },
        {
          "id": 614447772,
          "store_id": 4,
          "role_name": "Voter"
        },
        {
          "id": 614447773,
          "store_id": 5,
          "role_name": "Voter"
        },
        {
          "id": 614447774,
          "store_id": 2751139,
          "role": 1,
          "role_name": "Learner",
          "is_learner": true
        }
      ],
      "leader": {
        "id": 614447773,
        "store_id": 5,
        "role_name": "Voter"
      },
      "pending_peers": [
        {
          "id": 614447771,
          "store_id": 1,
          "role_name": "Voter"
        },
        {
          "id": 614447772,
          "store_id": 4,
          "role_name": "Voter"
        },
        {
          "id": 614447774,
          "store_id": 2751139,
          "role": 1,
          "role_name": "Learner",
          "is_learner": true
        }
      ]
    }
  ]
}

and Output of get region by id

{
  "id": 55929554,
  "epoch": {
    "conf_ver": 6,
    "version": 109399
  },
  "peers": [
    {
      "id": 55929555,
      "store_id": 1,
      "role_name": "Voter"
    },
    {
      "id": 55929556,
      "store_id": 4,
      "role_name": "Voter"
    },
    {
      "id": 55929557,
      "store_id": 5,
      "role_name": "Voter"
    },
    {
      "id": 55929558,
      "store_id": 2751139,
      "role": 1,
      "role_name": "Learner",
      "is_learner": true
    }
  ],
  "leader": {
    "id": 55929555,
    "store_id": 1,
    "role_name": "Voter"
  },
  "down_peers": [
    {
      "down_seconds": 40307,
      "peer": {
        "id": 55929556,
        "store_id": 4,
        "role_name": "Voter"
      }
    }
  ],
  "pending_peers": [
    {
      "id": 55929556,
      "store_id": 4,
      "role_name": "Voter"
    }
  ]
}

What version of PD are you using (pd-server -V)?