Expand scope of DurabilityProvider to include snapshotting#3281
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Looks great! Love the clear motivating comments.
The `DurabilityProvider` trait was introduced to enable the `HostController` to procure an alternative `Durability` impl from an external source. It is also useful to be able to instantiate a `SnapshotWorker` externally, in order to subscribe to snapshot creation events without access to the `RelationalDB` instance it is operating on. At a later stage, we may also use it to control the snapshot frequency externally. This patch thus reframes the trait as `PersistenceProvider`, whose job is to provide persistence-related services. Also separates snapshot creation and compression of older snapshots, and adds instrumentation to gather timing information for both.
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The `DurabilityProvider` trait was introduced to enable the `HostController` to procure an alternative `Durability` impl from an external source. It is also useful to be able to instantiate a `SnapshotWorker` externally, in order to subscribe to snapshot creation events without access to the `RelationalDB` instance it is operating on. At a later stage, we may also use it to control the snapshot frequency externally. This patch thus reframes the trait as `PersistenceProvider`, whose job is to provide persistence-related services. Also separates snapshot creation and compression of older snapshots, and adds instrumentation to gather timing information for both. # Description of Changes Re-submit of #3281 (reverted by #3293), with only the intended changes. # Expected complexity level and risk 1.5 # Testing No functional changes.
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The
DurabilityProvidertrait was introduced to enable theHostControllerto procure an alternativeDurabilityimpl from an external source.It is also useful to be able to instantiate a
SnapshotWorkerexternally, in order to subscribe to snapshot creation events without access to theRelationalDBinstance it is operating on.At a later stage, we may also use it to control the snapshot frequency externally.
This patch thus reframes the trait as
PersistenceProvider, whose job is to provide persistence-related services.Also separates snapshot creation and compression of older snapshots, and adds instrumentation to gather timing information for both.
Expected complexity level and risk
1.5
Testing
Not a functional change, existing tests should cover that.