Kamil Braun a664ac7ba5 treewide: require group0_guard when performing schema changes ...

`announce` now takes a `group0_guard` by value. `group0_guard` can only
be obtained through `migration_manager::start_group0_operation` and
moved, it cannot be constructed outside `migration_manager`.

The guard will be a method of ensuring linearizability for group 0
operations.

2022-01-24 15:20:35 +01:00

3.9 KiB

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