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The S3 storage engine currently has plugin maturity alpha in MariaDB Community Server 10.5.4:
https://github.com/MariaDB/server/blob/8394979aae274a19689102420ebb86580e26f92e/storage/maria/ha_s3.cc#L1080
When you install the package for the S3 storage engine on Debian or Ubuntu, it installs a configuration file that tries to load the plugin:
$ cat /etc/mysql/mariadb.conf.d/s3.cnf
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[mariadb]
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plugin-load-add=ha_s3
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#
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# Uncomment and configure the S3 engine
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#
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#s3-host-name=s3.amazonaws.com
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#s3-protocol-version=Amazon
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#s3-bucket=...
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#s3-access-key=...
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#s3-secret-key=...
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#s3-region=eu-north-1
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This configuration file does not set plugin_maturity=alpha, so this configuration file causes the plugin to fail to load:
2020-06-23 0:37:15 0 [ERROR] mysqld: Can't open shared library 'ha_s3.so' (errno: 1, Loading of alpha plugin S3 is prohibited by --plugin-maturity=gamma)
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2020-06-23 0:37:15 0 [ERROR] Couldn't load plugins from 'ha_s3.so'.
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Should s3.cnf set plugin_maturity=alpha, so that the plugin can be loaded successfully?
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