Sync upstream 2026-01-22#22
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This PR introduces revertible migrations, following the approach suggested by @jonahberquist. In case a migration causes production impact after the cut-over, it can be reverted quickly while preserving the writes that happened after the cut-over. When gh-ost is invoked with the --checkpoint flag and the migration completes, the migration can be reverted by invoking gh-ost again with the --revert flag and the --old-table flag specifying the name of the "old" table from the first migration e.g. _mytable_del. Also see docs/revert.md.
Since github#1536, performance_schema.metadata_locks is required to check the rename session holds the metadata lock on the migrated table during cut-over. On some setups such as Aurora RDS performance_schema is not enabled by default and it may be infeasible to enable. This PR adds --skip-metadata-lock-check flag to skip the check in this case.
coding-chimp
approved these changes
Jan 22, 2026
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This PR syncs
github/gh-ost@masterto our fork.Included changes:
TEXTgithub/gh-ost#1611