版本：tidb 4.0.13
操作：无操作
问题：pd异常切主
旧主报错如下（还有一些PD:etcd:ErrEtcdKVPut的报错）
[2022/08/25 17:32:21.656 +08:00] [ERROR] [tso.go:302] [“invalid timestamp”] [timestamp={}]
[2022/08/25 17:32:21.665 +08:00] [ERROR] [tso.go:302] [“invalid timestamp”] [timestamp={}]
[2022/08/25 17:32:21.673 +08:00] [ERROR] [tso.go:302] [“invalid timestamp”] [timestamp={}]
新主日志如下
[2022/08/25 17:32:43.058 +08:00] [INFO] [raft.go:923] [“6cf576fb46c07868 is starting a new election at term 2”]
[2022/08/25 17:32:43.063 +08:00] [INFO] [raft.go:729] [“6cf576fb46c07868 became pre-candidate at term 2”]
[2022/08/25 17:32:43.063 +08:00] [INFO] [raft.go:824] [“6cf576fb46c07868 received MsgPreVoteResp from 6cf576fb46c07868 at term 2”]
[2022/08/25 17:32:43.063 +08:00] [INFO] [raft.go:811] [“6cf576fb46c07868 [logterm: 2, index: 34283891] sent MsgPreVote request to a5bb61ba213ecdc0 at term 2”]
[2022/08/25 17:32:43.063 +08:00] [INFO] [raft.go:811] [“6cf576fb46c07868 [logterm: 2, index: 34283891] sent MsgPreVote request to b6aed577daad8738 at term 2”]
[2022/08/25 17:32:43.063 +08:00] [INFO] [node.go:331] [“raft.node: 6cf576fb46c07868 lost leader b6aed577daad8738 at term 2”]
[2022/08/25 17:32:43.066 +08:00] [INFO] [raft.go:824] [“6cf576fb46c07868 received MsgPreVoteResp from a5bb61ba213ecdc0 at term 2”]
[2022/08/25 17:32:43.066 +08:00] [INFO] [raft.go:1302] [“6cf576fb46c07868 has received 2 MsgPreVoteResp votes and 0 vote rejections”]
[2022/08/25 17:32:43.067 +08:00] [INFO] [raft.go:713] [“6cf576fb46c07868 became candidate at term 3”]
[2022/08/25 17:32:43.067 +08:00] [INFO] [raft.go:824] [“6cf576fb46c07868 received MsgVoteResp from 6cf576fb46c07868 at term 3”]
[2022/08/25 17:32:43.067 +08:00] [INFO] [raft.go:811] [“6cf576fb46c07868 [logterm: 2, index: 34283891] sent MsgVote request to a5bb61ba213ecdc0 at term 3”]
[2022/08/25 17:32:43.067 +08:00] [INFO] [raft.go:811] [“6cf576fb46c07868 [logterm: 2, index: 34283891] sent MsgVote request to b6aed577daad8738 at term 3”]
[2022/08/25 17:32:43.067 +08:00] [INFO] [raft.go:824] [“6cf576fb46c07868 received MsgVoteResp from a5bb61ba213ecdc0 at term 3”]
[2022/08/25 17:32:50.469 +08:00] [ERROR] [client.go:172] [“region sync with leader meet error”] [error="[PD:grpc:ErrGRPCRecv]rpc error: code = Canceled desc = context canceled"]
[2022/08/25 17:32:51.470 +08:00] [INFO] [server.go:1099] [“leader changed, try to campaign leader”]
[2022/08/25 17:32:51.470 +08:00] [INFO] [server.go:1115] [“start to campaign leader”] [campaign-leader-name=pd-192.168.1.2-13115]
[2022/08/25 17:32:51.472 +08:00] [INFO] [server.go:1134] [“campaign leader ok”] [campaign-leader-name=pd-192.168.1.2-13115]
[2022/08/25 17:32:51.485 +08:00] [INFO] [server.go:158] [“establish sync region stream”] [requested-server=pd-192.168.1.1-13115] [url=http://192.168.1.1:13115]
[2022/08/25 17:32:51.485 +08:00] [INFO] [server.go:176] [“requested server has already in sync with server”] [requested-server=pd-192.168.1.1-13115] [server=pd-192.168.1.2-13115] [last-
index=1089874144]
[2022/08/25 17:32:51.492 +08:00] [INFO] [tso.go:298] [“sync hasn’t completed yet, wait for a while”]
[2022/08/25 17:32:51.495 +08:00] [INFO] [tso.go:298] [“sync hasn’t completed yet, wait for a while”]
[2022/08/25 17:32:51.514 +08:00] [INFO] [tso.go:298] [“sync hasn’t completed yet, wait for a while”]
看起来像是更新时间戳出现了问题，想了解一下这个问题是什么原因导致的（都有哪些原因导致更新时间戳会失败）
