Comment 3 for bug 1612517

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Lars Tangvald (lars-tangvald) wrote :

thread_concurrency was removed in 5.7. It only had an effect on older Solaris systems, so simply removing it from the config should not cause any change.

https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_thread_concurrency