Enum rustis::commands::RequestPolicy

pub enum RequestPolicy {
    AllNodes,
    AllShards,
    MultiShard,
    Special,
}

This tip can help clients determine the shards to send the command in clustering mode.

The default behavior a client should implement for commands without the request_policy tip is as follows:

1. The command doesn’t accept key name arguments: the client can execute the command on an arbitrary shard.
2. For commands that accept one or more key name arguments: the client should route the command to a single shard, as determined by the hash slot of the input keys.

Variants

AllNodes

the client should execute the command on all nodes - masters and replicas alike.

An example is the config_set command. This tip is in-use by commands that don’t accept key name arguments. The command operates atomically per shard.

AllShards

the client should execute the command on all master shards (e.g., the dbsize command).

This tip is in-use by commands that don’t accept key name arguments. The command operates atomically per shard.

MultiShard

the client should execute the command on several shards.

The shards that execute the command are determined by the hash slots of its input key name arguments. Examples for such commands include mset, mget and del. However, note that sunionstore isn’t considered as multi_shard because all of its keys must belong to the same hash slot.

Special

indicates a non-trivial form of the client’s request policy, such as the scan command.

Trait Implementations

impl Clone for RequestPolicy

fn clone(&self) -> RequestPolicy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RequestPolicy

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RequestPolicy

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl FromStr for RequestPolicy

type Err = Error

The associated error which can be returned from parsing.

fn from_str(str: &str) -> Result<Self>

Parses a string s to return a value of this type.