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do you have

transparent_reconnection

set to true in client jdbc client? https://github.com/apache/druid/blob/master/docs/api-reference/sql-jdbc.md

we tried setting this up, but we couldnt resolve this

How are you querying brokers? do you connection stickiness ? https://druid.apache.org/docs/latest/api-reference/sql-jdbc#connection-stickiness What is avatica version on client side?

I have same problem, which may be related to some connection pool configuration — but it's still unclear what exactly causes this error. We plan to move to native requests expecting this will be resolved, but still it would be great to have some ideas of what is the real problem here. @sriramdas sivasai, did you had any further investigations/findings?

hey you just remove the driver class mentioned in your config which is like "com.mysql.cj.**"

In the druid config? I can't find anything similar...