server id lease not released when tidb exit #64191
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
- use
tiup playgroundto create test cluster (latest 8.5.3) - confirm server id and lease id
via tidb log:
[2025/10/30 15:27:27.322 +08:00] [INFO] [domain.go:3096] [acquireServerID] [serverID=624] ["lease id"=22319a3403996cf7]
via etcd ctl
❯ etcdctl --endpoints 127.0.0.1:2379 get "/tidb/server_id/624" --prefix -w fields
"ClusterID" : 15674009460217235928
"MemberID" : 3474484975246189105
"Revision" : 410
"RaftTerm" : 2
"Key" : "/tidb/server_id/624"
"CreateRevision" : 254
"ModRevision" : 401
"Version" : 2
"Value" : "0"
"Lease" : 2463920019337735415
"More" : false
"Count" : 1
❯ printf "%x" 2463920019337735415
22319a3403996cf7%
- scale-in tidb
tiup playground scale-in --pid xxx
2. What did you expect to see? (Required)
- key
/tidb/server_id/624deleted and lease22319a3403996cf7revoked
3. What did you see instead (Required)
- key
/tidb/server_id/624deleted but lease22319a3403996cf7was left intact
❯ etcdctl --endpoints 127.0.0.1:2379 lease timetolive 22319a3403996cf7
lease 22319a3403996cf7 granted with TTL(43200s), remaining(42674s)
❯ etcdctl --endpoints 127.0.0.1:2379 get "/tidb/server_id/624" --prefix -w fields
"ClusterID" : 15674009460217235928
"MemberID" : 3474484975246189105
"Revision" : 494
"RaftTerm" : 2
"More" : false
"Count" : 0
this accumulate etcd stresses with each tidb restart/ new instance, and if many lease expire at the same time, it might cause pd failure.
4. What is your TiDB version? (Required)
master