Struct rocksdb::CuckooTableOptions

pub struct CuckooTableOptions { /* private fields */ }

Configuration of cuckoo-based storage.

Implementations

impl CuckooTableOptions

pub fn set_hash_ratio(&mut self, ratio: f64)

Determines the utilization of hash tables. Smaller values result in larger hash tables with fewer collisions. Default: 0.9

pub fn set_max_search_depth(&mut self, depth: u32)

A property used by builder to determine the depth to go to to search for a path to displace elements in case of collision. See Builder.MakeSpaceForKey method. Higher values result in more efficient hash tables with fewer lookups but take more time to build. Default: 100

pub fn set_cuckoo_block_size(&mut self, size: u32)

In case of collision while inserting, the builder attempts to insert in the next cuckoo_block_size locations before skipping over to the next Cuckoo hash function. This makes lookups more cache friendly in case of collisions. Default: 5

pub fn set_identity_as_first_hash(&mut self, flag: bool)

If this option is enabled, user key is treated as uint64_t and its value is used as hash value directly. This option changes builder’s behavior. Reader ignore this option and behave according to what specified in table property. Default: false

pub fn set_use_module_hash(&mut self, flag: bool)

If this option is set to true, module is used during hash calculation. This often yields better space efficiency at the cost of performance. If this option is set to false, # of entries in table is constrained to be power of two, and bit and is used to calculate hash, which is faster in general. Default: true

Trait Implementations

impl Default for CuckooTableOptions

fn default() -> Self

Returns the “default value” for a type.

impl Drop for CuckooTableOptions

fn drop(&mut self)

Executes the destructor for this type.

impl Send for CuckooTableOptions

impl Sync for CuckooTableOptions