Function rd_kafka_incremental_assign

pub unsafe extern "C" fn rd_kafka_incremental_assign(
    rk: *mut rd_kafka_t,
    partitions: *const rd_kafka_topic_partition_list_t,
) -> *mut rd_kafka_error_t

Incrementally add \p partitions to the current assignment.

If a COOPERATIVE assignor (i.e. incremental rebalancing) is being used, this method should be used in a rebalance callback to adjust the current assignment appropriately in the case where the rebalance type is RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS. The application must pass the partition list passed to the callback (or a copy of it), even if the list is empty. `partitions must not be NULL. This method may also be used outside the context of a rebalance callback.

Returns NULL on success, or an error object if the operation was unsuccessful.

@remark The returned error object (if not NULL) must be destroyed with rd_kafka_error_destroy().