[tidb-x] after pd switching leader, the heartbeat between tikv and pd was abnormal and could not be recovered
Open
may-affects-6.5
may-affects-7.1
may-affects-7.5
may-affects-8.1
may-affects-8.5
severity/critical
type/bug
- Dominant language
- Go
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Description
## Bug Report
### What did you do?
1、run sysbench
2、add index for one table
3、simulated pd io delay 5s which trigger pd restart
### What did you expect to see?
after pd recover，tikv and pd can communicate normally
### What did you see instead?
after switching leader, the heartbeat between tikv and pd was abnormal and could not be recovered
### What version of PD are you using (`pd-server -V`)?
./pd-server -V
Release Version: v8.5.4-nextgen.202510.6-1-g17478bb
Edition: Enterprise
Kernel Type: Next Generation
Git Commit Hash: 17478bbf6f8e77a6fd820fe208a469e006358382
Git Branch: HEAD
UTC Build Time: 2026-01-22 03:25:59
2026-02-08T08:18:51.144+0800
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