SHOW CONFIG execution burst warning

[liaohongxing]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

mysql> SHOW CONFIG;
2505 rows in set, 3 warnings (0.21 sec)
mysql> SHOW WARNINGS;
+---------+------+----------------------------------------------+
| Level   | Code | Message                                      |
+---------+------+----------------------------------------------+
| Warning | 1105 | unknown node type: tiflash(192.168.0.4:3930) |
| Warning | 1105 | unknown node type: tiflash(192.168.0.5:3930) |
| Warning | 1105 | unknown node type: tiflash(192.168.0.3:3930) |
+---------+------+----------------------------------------------+
3 rows in set (0.03 sec)

2. What did you expect to see? (Required)

no warnings

3. What did you see instead (Required)

3 warnings

4. What is your TiDB version? (Required)

mysql> select tidb_version();
Release Version: v5.0.0
Edition: Community
Git Commit Hash: bdac0885cd11bdf571aad9353bfc24e13554b91c
Git Branch: heads/refs/tags/v5.0.0
UTC Build Time: 2021-04-06 16:36:29
GoVersion: go1.13
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false 

[ichn-hu]

/assign @ichn-hu

[ichn-hu]

@liaohongxing I can't reproduce it with tiup playground would you like to provide more details on how to reproduce?

[liaohongxing]

@ichn-hu This is my production cluster and I haven't used tiup playground

[liaohongxing]

@ichn-hu
Cluster topology

node1
  TIDB
  TIKV
  TIFLASH 192.168.0.4:3930

 node2
  TIDB
  TIKV
  TIFLASH 192.168.0.3:3930 

node3
  TIDB
  TIKV
  TIFLASH 192.168.0.5:3930

[ichn-hu]

@liaohongxing is your tiflash nodes still functioning?

[liaohongxing]

@ichn-hu tiflash is normal

[liaohongxing]

@ichn-hu
Step1

mysql> SHOW CONFIG;
...
2505 rows in set, 3 warnings (0.21 sec)

Step2

mysql> show warnings;
+---------+------+----------------------------------------------+
| Level   | Code | Message                                      |
+---------+------+----------------------------------------------+
| Warning | 1105 | unknown node type: tiflash(192.168.0.4:3930) |
| Warning | 1105 | unknown node type: tiflash(192.168.0.5:3930) |
| Warning | 1105 | unknown node type: tiflash(192.168.0.3:3930) |
+---------+------+----------------------------------------------+
3 rows in set (0.00 sec)

[ichn-hu]

@ichn-hu tiflash is normal

seems this is from tiup, would you like to share your cluster.yml file?

[ti-srebot]

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1. Root Cause Analysis (RCA) (optional)

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4. Workaround (optional)

5. Affected versions

6. Fixed versions

[solotzg]

@ichn-hu TiDB should access status-address of tiflash to get config.