[next gen on clould] connection count can not balance after tidb memory increased

[Lily2025]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1、run batch insert

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

connection count can balance

3. What did you see instead (Required)

connection count can not balanced after tidb memory increased

4. What is your version? (Required)

mysql> select distinct concat('[',type,']') component_type, concat('version:',version,',') version,concat('git_hash:',git_hash) git_hash from information_schema.cluster_info;
+-------------------+----------------------------------------------+---------------------------------------------------+
| component_type | version | git_hash |
+-------------------+----------------------------------------------+---------------------------------------------------+
| [tiflash_compute] | version:9.0.0-beta.2.pre-79-gc68b24e1a, | git_hash:c68b24e1a901797f84d01bf9b950fb776597d418 |
| [tidb] | version:8.5.4-nextgen.202510.0-7-gc634954, | git_hash:c634954c6ea64c0d4547b5273e92421cca2cb12e |
| [pd] | version:8.5.4-nextgen.202510.1-1-gf912cdd, | git_hash:f912cdd1e9cdae8d4927b888545e6f003bea375a |
| [tso] | version:8.5.4-nextgen.202510.1-1-gf912cdd, | git_hash:f912cdd1e9cdae8d4927b888545e6f003bea375a |
| [scheduling] | version:8.5.4-nextgen.202510.1-1-gf912cdd, | git_hash:f912cdd1e9cdae8d4927b888545e6f003bea375a |
| [tikv] | version:8.5.0, | git_hash:15e3ce20089cc5ec97e2f07a5880cf6f732c0780 |
| [tiflash_write] | version:8.5.4-nextgen.202510.0-3-g492b32cd2, | git_hash:492b32cd2f8576cc3cfd4bc1bf936060c9c7cfe7 |
+-------------------+----------------------------------------------+---------------------------------------------------+
7 rows in set (0.09 sec)

mysql>

[Lily2025]

/assign YangKeao
/severity critical