oslo.db/releasenotes/notes/fix_mysql_wsrsp-0ef98dec5ea...

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---
fixes:
- |
The newly added mysql_wsrep_sync_wait parameter now defaults to non-present
in the enginefacade's default configuration options, so that it is not
configured in a MySQL / MariaDB database by default, unless passed in the
options explicitly. Previously, the default value was "0", meaning the
wsrep_sync_wait parameter would be set unconditionally on new connections,
which would fail for MySQL backends that don't provide for this setting.