TiFlash not working after upgrading from 7.1.2 to 7.5.0

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

Original topic: 从7.1.2升级到7.5.0之后tiflash用不了

| username: zengchaojie

After upgrading from 7.1.2 to 7.5.0, TiFlash is not working. Setting tidb_allow_mpp=1 makes it work again.

| username: tidb菜鸟一只 | Original post link

I think I’ve seen this issue on the forum before. Is it a bug?