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HummockReadEpoch

risingwave_hummock_sdk

Enum HummockReadEpoch 

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pub enum HummockReadEpoch {
    Committed(HummockEpoch),
    BatchQueryCommitted(HummockEpoch, HummockVersionId),
    NoWait(HummockEpoch),
    Backup(HummockEpoch),
    TimeTravel(HummockEpoch),
    LatestCommitted(HummockVersionId),
}
Expand description

Package read epoch of hummock, it be used for wait_epoch

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Committed(HummockEpoch)

We need to wait the committed_epoch of the read table

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BatchQueryCommitted(HummockEpoch, HummockVersionId)

Wait for the table’s committed epoch. The version ID is used only when the table is absent, to distinguish delayed registration from a dropped table.

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NoWait(HummockEpoch)

We don’t need to wait epoch, we usually do stream reading with it.

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Backup(HummockEpoch)

We don’t need to wait epoch.

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TimeTravel(HummockEpoch)

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LatestCommitted(HummockVersionId)

Resolve the local committed version and table epoch when creating a snapshot. The version ID distinguishes delayed table registration from a dropped table.

Implementations§

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impl HummockReadEpoch

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pub fn get_epoch(&self) -> Option<HummockEpoch>

Returns no numeric epoch until a latest-committed request has been resolved.

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pub fn is_read_committed(&self) -> bool

Trait Implementations§

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impl Clone for HummockReadEpoch

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fn clone(&self) -> HummockReadEpoch

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for HummockReadEpoch

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impl Debug for HummockReadEpoch

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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 From<BatchQueryEpoch> for HummockReadEpoch

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fn from(e: BatchQueryEpoch) -> Self

Converts to this type from the input type.

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