Enum Assignment 

#[non_exhaustive]
pub enum Assignment {
    Range,
    RoundRobin,
    CooperativeSticky,
}

The partition assignment strategy for the consumer group (librdkafka’s partition.assignment.strategy).

These are librdkafka’s built-in strategies; the client offers no API for a custom group assignor (the rebalance callback only observes assignments). Cooperative and eager strategies cannot mix within one group - librdkafka rejects the join, and the error surfaces on the subscriber stream.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Range

Co-partitioned ranges per topic (the Kafka default family).

RoundRobin

Round-robin across all subscribed topics.

CooperativeSticky

Incremental cooperative rebalancing: unaffected partitions keep flowing during a rebalance instead of stopping the world.

Trait Implementations

impl Clone for Assignment

fn clone(&self) -> Assignment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Assignment

impl Debug for Assignment

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

Formats the value using the given formatter.

impl Eq for Assignment

impl PartialEq for Assignment

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Assignment