"MySQL server has gone away"

Hi all,

I am getting the following error in the middle of a long-running
process: “Mysql::Error: Lost connection to MySQL server during
When rescued and retried, it throws the next error: “Mysql::Error:
MySQL server has gone away”

(1) The query is not long and (2) the process does not last longer
than 8 hours (it’s < 15 minutes) or idle for a long period.

I’ve tried: ActiveRecord::Base.allow_concurrency = true,
ActiveRecord::Base.verification_timeout = 10, and

I can use (1) ActiveRecord::Base.connection_pool.with_connection or
(2) ActiveRecord::Base.verify_active_connections! to fix it, but…

when future queries search for data that was inserted previously in
the process, it is no longer there. It seems like there’s something
wrapped around everything - tied to the connection - that prevents any
writes from really persisting to the database until, I’m assuming, the
process is complete.

How do I fix the lost MySQL connections or at least make writes
persist to the database mid-process so that when I open a new
connection the records will be there?

Any help is appreciated.



Did you check mysql config on server?