Struct tikv::storage::txn::commands::ResolveLock [−][src]
Resolve locks according to txn_status
.
During the GC operation, this should be called to clean up stale locks whose timestamp is
before safe point.
This should follow after a ResolveLockReadPhase
.
Fields
ctx: Context
txn_status: HashMap<TimeStamp, TimeStamp>
Maps lock_ts to commit_ts. If a transaction was rolled back, it is mapped to 0.
For example, let txn_status
be { 100: 101, 102: 0 }
, then it means that the transaction
whose start_ts is 100 was committed with commit_ts 101
, and the transaction whose
start_ts is 102 was rolled back. If there are these keys in the db:
- “k1”, lock_ts = 100
- “k2”, lock_ts = 102
- “k3”, lock_ts = 104
- “k4”, no lock
Here "k1"
, "k2"
and "k3"
each has a not-yet-committed version, because they have
locks. After calling resolve_lock, "k1"
will be committed with commit_ts = 101 and "k2"
will be rolled back. "k3"
will not be affected, because its lock_ts is not contained in
txn_status
. "k4"
will not be affected either, because it doesn’t have a non-committed
version.
scan_key: Option<Key>
key_locks: Vec<(Key, Lock)>
Implementations
impl ResolveLock
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pub fn new(
txn_status: HashMap<TimeStamp, TimeStamp>,
scan_key: Option<Key>,
key_locks: Vec<(Key, Lock)>,
ctx: Context
) -> TypedCommand<()>
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txn_status: HashMap<TimeStamp, TimeStamp>,
scan_key: Option<Key>,
key_locks: Vec<(Key, Lock)>,
ctx: Context
) -> TypedCommand<()>
Return a TypedCommand
that encapsulates the result of executing this command.
Trait Implementations
impl CommandExt for ResolveLock
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fn get_ctx(&self) -> &Context
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fn get_ctx_mut(&mut self) -> &mut Context
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fn tag(&self) -> CommandKind
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fn incr_cmd_metric(&self)
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fn readonly(&self) -> bool
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fn is_sys_cmd(&self) -> bool
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fn write_bytes(&self) -> usize
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fn gen_lock(&self) -> Lock
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fn ts(&self) -> TimeStamp
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fn can_be_pipelined(&self) -> bool
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impl Debug for ResolveLock
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impl Display for ResolveLock
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impl<S: Snapshot, L: LockManager> WriteCommand<S, L> for ResolveLock
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fn process_write(
self,
snapshot: S,
context: WriteContext<'_, L>
) -> Result<WriteResult>
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self,
snapshot: S,
context: WriteContext<'_, L>
) -> Result<WriteResult>
Auto Trait Implementations
impl RefUnwindSafe for ResolveLock
impl Send for ResolveLock
impl Sync for ResolveLock
impl Unpin for ResolveLock
impl UnwindSafe for ResolveLock
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<V, W> ConvertFrom<W> for V where
W: ConvertTo<V>,
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W: ConvertTo<V>,
pub fn convert_from(ctx: &mut EvalContext, from: W) -> Result<V, Error>
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impl<T> From<T> for T
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impl<T> Instrument for T
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pub fn instrument(self, span: Span) -> Instrumented<Self>
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pub fn in_current_span(self) -> Instrumented<Self>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> Pointable for T
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pub const ALIGN: usize
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type Init = T
The type for initializers.
pub unsafe fn init(init: <T as Pointable>::Init) -> usize
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pub unsafe fn deref<'a>(ptr: usize) -> &'a T
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pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T
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pub unsafe fn drop(ptr: usize)
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impl<T> Pointable for T
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pub const ALIGN: usize
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type Init = T
The type for initializers.
pub unsafe fn init(init: <T as Pointable>::Init) -> usize
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pub unsafe fn deref<'a>(ptr: usize) -> &'a T
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pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T
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pub unsafe fn drop(ptr: usize)
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impl<T> Same<T> for T
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type Output = T
Should always be Self
impl<T> Sealed<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> SendSyncUnwindSafe for T where
T: Send + Sync + UnwindSafe + ?Sized,
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T: Send + Sync + UnwindSafe + ?Sized,
impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
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V: MultiLane<T>,