Method shared_upper

src/persist-client/src/write.rs:267–269

A less-stale cached version of the shard-global `upper` frontier. This is the most recently known upper for this shard process-wide, but unlike [Self::upper] it requires a mutex and a clone. This will always be less or equal to the shard-global `upper`.

(&self)

    /// unlike [Self::upper] it requires a mutex and a clone. This will always be
    /// less or equal to the shard-global `upper`.
    pub fn shared_upper(&self) -> Antichain<T> {
        self.machine.applier.clone_upper()
    }

    /// Fetches and returns a recent shard-global `upper`. Importantly, this operation is
    /// linearized with write operations.