TiDB cannot connect, but the server load for PD and TiKV appears normal

Note:
This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: tidb连不上,但是pd tikv 的服务器压力看着正常

| username: Jjjjayson_zeng

[TiDB Usage Environment] Production Environment
[TiDB Version]
[Reproduction Path] What operations were performed when the issue occurred
[Encountered Issue: Issue Symptoms and Impact]
[Resource Configuration]
[Attachment: Screenshot/Log/Monitoring]

| username: tidb狂热爱好者 | Original post link

Moreover, you can add a new TiDB node to connect to a TiDB.

| username: TiDBer_pkQ5q1l0 | Original post link

Try manually connecting to the problematic tikv-server if you can’t connect.

| username: Jjjjayson_zeng | Original post link

What operation is this? I don’t quite understand. Isn’t connecting to TiDB always done through a single address?

| username: 裤衩儿飞上天 | Original post link

Check if the TiDB server status is normal. Can you connect manually?

| username: Jjjjayson_zeng | Original post link

We currently have these machines.

| username: tidb狂热爱好者 | Original post link

The screenshot doesn’t include TiDB.

| username: liuis | Original post link

Can the terminal connection be established?

| username: Jjjjayson_zeng | Original post link

The pressure is quite high, sometimes it can’t connect.

| username: Jjjjayson_zeng | Original post link

Intermittent, but still need to find the reason for the high pressure on TiDB.

| username: tidb狂热爱好者 | Original post link

Your stress level is relatively high, which can be seen through the heatmap.