Enum RecoveryEstimate 

pub enum RecoveryEstimate {
    Immediate,
    NotRecoverable,
    UnknownStateSize {
        hint: &'static str,
    },
    Hydrate {
        state_mb: u32,
        seconds: f64,
        basis: String,
    },
    Measured {
        seconds: f64,
        bytes: u64,
        measured_at: DateTime<Utc>,
        age_days: i64,
        node: String,
        basis: String,
    },
}

How long it takes to get the state back, and on what basis that is claimed.

Hydrate is an extrapolation from two measured constants (MEASURED_HYDRATE_MB_PER_S, MEASURED_GET_RTT_MS) applied to a declared state size — one measurement, on one host, against one backend, stretched over a number an operator typed. That is stated on the type rather than in a footnote because a recovery-time number without its provenance is the single easiest thing in a planning report to mistake for a measurement.

Measured (R850-T2) is the exception and the thing to prefer: a restore that was actually timed, by turso-backup-hydrate, replayed out of .yah/cloud/recovery.jsonl by CloudConfig::load into CloudConfig::recovery_measurements. It carries its own provenance and its age, for the same reason — and it is never discarded for being old. A real restore from six weeks ago is a better answer than an extrapolation from an unrelated host; it is reported with “measured N days ago” attached so the reader can discount it themselves.

Variants

Immediate

Nothing to hydrate — the workload carries no durable state.

NotRecoverable

There is no copy to recover from. Recovery is not a duration.

UnknownStateSize

A copy exists but the spec does not say how big the state is, so the transfer cannot be estimated. Names the annotation that would fix it.

Fields

hint: &'static str

Hydrate

Bulk transfer of a declared state size at the measured throughput.

Fields

state_mb: u32

seconds: f64

basis: String

Verbatim provenance, carried into JSON so a consumer cannot strip it.

Measured

A real restore of this workload, timed on a real host. Summed over the workload’s subjects, because the helper restores them one at a time and a workload’s recovery is all of them.

Fields

seconds: f64

Summed measured wall-clock seconds.

bytes: u64

Summed bytes on disk after the restore. Not a declaration — this is what actually landed.

measured_at: DateTime<Utc>

When the oldest component of the sum was measured. A sum is only as fresh as its stalest part.

age_days: i64

Whole days from measured_at to when the journal was replayed. Carried into JSON beside basis so a consumer can strip neither the provenance nor the age.

node: String

The machine the most recent measurement was taken on. A restore time is a property of a host as much as of a database.

basis: String

Verbatim provenance, carried into JSON so a consumer cannot strip it.

Implementations

impl RecoveryEstimate

pub fn headline(&self) -> String

One line for a text report.

Trait Implementations

impl Clone for RecoveryEstimate

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RecoveryEstimate

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for RecoveryEstimate

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for RecoveryEstimate

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for RecoveryEstimate