MonotonicDeleteEvent

risingwave_storage::hummock::sstable

Struct MonotonicDeleteEvent 

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pub struct MonotonicDeleteEvent {
    pub event_key: PointRange,
    pub new_epoch: HummockEpoch,
}
Expand description

Assume that watermark1 is 5, watermark2 is 7, watermark3 is 11, delete ranges { [0, wmk1) in epoch1, [wmk1, wmk2) in epoch2, [wmk2, wmk3) in epoch3 } can be transformed into events below: { <0, +epoch1> <wmk1, -epoch1> <wmk1, +epoch2> <wmk2, -epoch2> <wmk2, +epoch3> <wmk3, -epoch3> } Then we can get monotonic events (they are in order by user key) as below: { <0, epoch1>, <wmk1, epoch2>, <wmk2, epoch3>, <wmk3, +inf> } which means that delete range of [0, wmk1) is epoch1, delete range of [wmk1, wmk2) if epoch2, etc. In this example, at the event key wmk1 (5), delete range changes from epoch1 to epoch2, thus the new epoch is epoch2. epoch2 will be used from the event key wmk1 (5) and till the next event key wmk2 (7) (not inclusive). If there is no range deletes between current event key and next event key, new_epoch will be HummockEpoch::MAX.

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§event_key: PointRange§new_epoch: HummockEpoch

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impl MonotonicDeleteEvent

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pub fn encode(&self, buf: impl BufMut)

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pub fn decode(buf: &mut &[u8]) -> Self

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impl Clone for MonotonicDeleteEvent

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fn clone(&self) -> MonotonicDeleteEvent

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for MonotonicDeleteEvent

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

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for MonotonicDeleteEvent

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for MonotonicDeleteEvent

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for MonotonicDeleteEvent

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

Serialize this value into the given Serde serializer. Read more
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impl Eq for MonotonicDeleteEvent

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impl StructuralPartialEq for MonotonicDeleteEvent

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