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ShardKeyMode

reddb::cluster

Enum ShardKeyMode 

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pub enum ShardKeyMode {
    Hash,
    Ordered,
}
Expand description

Collection-level partitioning mode for shard/range ownership.

Per the glossary, “Hash mode is the default for uniform distribution; ordered mode is declared when range locality and ordered scans matter more than automatic hotspot resistance.” The mode is fixed per collection: every range of a collection shares its mode, and an entry whose mode disagrees with its collection’s declared mode is rejected (CatalogError::ShardKeyModeMismatch).

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Hash

Uniform hash distribution — the default. Bounds are over hash tokens.

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Ordered

Ordered key ranges, declared for range locality / ordered scans. Bounds are over the ordered shard key itself.

Trait Implementations§

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impl Clone for ShardKeyMode

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fn clone(&self) -> ShardKeyMode

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 ShardKeyMode

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impl Debug for ShardKeyMode

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

Formats the value using the given formatter. Read more
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impl Default for ShardKeyMode

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fn default() -> ShardKeyMode

Returns the “default value” for a type. Read more
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impl Eq for ShardKeyMode

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impl PartialEq for ShardKeyMode

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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 StructuralPartialEq for ShardKeyMode

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn equivalent(&self, key: &K) -> bool

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