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When current 10.3 server attempts to crash-upgrade from current 10.1, e.g. 10.1.26, it says
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10.3 e1051590b61b455
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2017-08-31 4:13:38 0 [ERROR] InnoDB: Upgrade after a crash is not supported. This redo log was created before MariaDB 10.2.2.
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2017-08-31 4:13:38 0 [ERROR] InnoDB: Plugin initialization aborted at srv0start.cc[2218] with error Generic error
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which kind of implies that if redo log was created after 10.2.2, it would have been supported.
However, upon crash-upgrade from the current 10.2 (e.g. 10.2.8) it says
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10.3 e1051590b61b455
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2017-08-31 2:37:53 0 [ERROR] InnoDB: Upgrade after a crash is not supported. The redo log was created with MariaDB 10.2.8.
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2017-08-31 2:37:53 0 [ERROR] InnoDB: Plugin initialization aborted at srv0start.cc[2218] with error Generic error
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It's not critical, but maybe some clean-up is due there.
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