破案了因为设置了Placement Rule
pd-ctl config placement-rules show --pd ${PD_ADDR} --key ${KEY} --cert ${CERT} --cacert ${CACERT}
[
{
“group_id”: “pd”,
“id”: “default”,
“start_key”: “”,
“end_key”: “”,
“role”: “voter”,
“is_witness”: false,
“count”: 3,
“location_labels”: [
“zone”,
“rack”,
“host”
]
}
]