Enum TabletState 

pub enum TabletState {
    Creating,
    Active,
    Splitting,
    Merging,
    Retiring,
    Retired,
}

Lifecycle state of a tablet (spec sections 12.1, 12.5, 12.6). Declaration order is frozen; variants are never reused (spec section 4.10).

Variants

Creating

Created as learners and catching up; never routed to (spec section 12.5: do not expose child tablets before catch-up).

Active

Serving traffic.

Splitting

Split in flight: the source remains the routable owner until the children are published atomically (spec section 12.5).

Merging

Merge in flight: the sources remain routable until the hidden replacement is published atomically (spec section 12.6).

Retiring

Retired from routing by an atomic publication; retained until no old-generation requests or pins remain (spec section 12.5 step 10).

Retired

Fully retired; replicas may be removed. Terminal: tablet identifiers are never reused (spec section 7).

Implementations

impl TabletState

pub fn can_transition_to(self, next: Self) -> bool

Whether the transition self -> next is permitted.

The graph (enforced here, applied at quorum by the meta group):

Creating  -> Active | Retired          (catch-up done / creation aborted)
Active    -> Splitting | Merging | Retiring
Splitting -> Active | Retiring         (split aborted / children published)
Merging   -> Active | Retiring         (merge aborted / replacement published)
Retiring  -> Retired                   (no old-generation pins remain)
Retired   -> (terminal)

pub fn is_routable(self) -> bool

Whether requests may be routed to this tablet: the serving owner (Active) and the sources of an in-flight split or merge, which stay authoritative until the atomic publication flips them to TabletState::Retiring. Creating tablets are never exposed (spec section 12.5).

Trait Implementations

impl Clone for TabletState

fn clone(&self) -> TabletState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TabletState

impl Debug for TabletState

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TabletState

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for TabletState

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

Formats the value using the given formatter.

impl Eq for TabletState

impl Hash for TabletState

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TabletState

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for TabletState

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 TabletState