Classe « ReadPreference »

Méthode pymongo.ReadPreference.PRIMARY_PREFERRED

Signature de la méthode PRIMARY_PREFERRED

def PRIMARY_PREFERRED(selection) 

Description

PRIMARY_PREFERRED.__doc__

PrimaryPreferred read preference.

    * When directly connected to one mongod queries are allowed to standalone
      servers, to a replica set primary, or to replica set secondaries.
    * When connected to a mongos queries are sent to the primary of a shard if
      available, otherwise a shard secondary.
    * When connected to a replica set queries are sent to the primary if
      available, otherwise a secondary.

    .. note:: When a :class:`~pymongo.mongo_client.MongoClient` is first
      created reads will be routed to an available secondary until the
      primary of the replica set is discovered.

    :Parameters:
      - `tag_sets`: The :attr:`~tag_sets` to use if the primary is not
        available.
      - `max_staleness`: (integer, in seconds) The maximum estimated
        length of time a replica set secondary can fall behind the primary in
        replication before it will no longer be selected for operations.
        Default -1, meaning no maximum. If it is set, it must be at least
        90 seconds.
      - `hedge`: The :attr:`~hedge` to use if the primary is not available.

    .. versionchanged:: 3.11
       Added ``hedge`` parameter.