Region snapshot replacement for read-only regions #7435
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Reuse the region snapshot replacement machinery to replace read-only regions. This is done by storing a replacement type in the region snapshot replacement record such that either a region snapshot _or_ a read-only region can be the subject of this type of replacement. The procedure for both types is the same so all the code can be reused. A future commit will rename region snapshot replacement (and all references) to "read-only target replacement" to reflect that the machinery now applies to both region snapshots and read-only regions. This will be a mostly mechanical set of changes that can be reviewed separately with much less scrutiny. Right now manually requesting a region replacement with omdb is done through the region replacement manual request, not the region snapshot replacement manual request. This will change in that future commit to be part of a read-only target replacement request.
leftwo
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Feb 5, 2025
nexus/src/app/background/tasks/region_snapshot_replacement_garbage_collect.rs
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addresses test flake due to slow systems being at the start of execution, then bailing out of the wait for condition, then querying for the state and seeing that it's in the middle of execution
I set every poll interval related to the background task and crucible polling to 500 milliseconds, and this is way too long for computers. Cut that by 10 to 50 milliseconds. Also, more `wait_for_all_replacements` calls to make sure replacement tasks are finished. This should address timeout test flakes in CI.
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Reuse the region snapshot replacement machinery to replace read-only regions. This is done by storing a replacement type in the region snapshot replacement record such that either a region snapshot or a read-only region can be the subject of this type of replacement. The procedure for both types is the same so all the code can be reused.
A future commit will rename region snapshot replacement (and all references) to "read-only target replacement" to reflect that the machinery now applies to both region snapshots and read-only regions. This will be a mostly mechanical set of changes that can be reviewed separately with much less scrutiny. Right now manually requesting a region replacement with omdb is done through the region replacement manual request, not the region snapshot replacement manual request. This will change in that future commit to be part of a read-only target replacement request.
Fixes #6172