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StorageVersion

dag::ops

Trait StorageVersion 

Source 
pub trait StorageVersion {
    // Required method
    fn storage_version(&self) -> (u64, u64);
}
Expand description

Has a tuple version that can be used to test if the data was changed.

Required Methods§

Source

fn storage_version(&self) -> (u64, u64)

Version tracked by the underlying low-level storage (ex. indexedlog). (epoch, length).

  • If epoch is changed, then a non-append-only change has happened, all caches should be invalidated.
  • If length is increased but epoch has changed, then the storage layer got an append-only change. Note: the append-only change at the storage layer does not mean append-only at the commit graph layer, since the strip operation that removes commits could be implemented by appending special data to the storage layer.

Implementors§