We create link:#patroni.postgresql.mpp.AbstractMPP[`+AbstractMPP+`] and link:#patroni.postgresql.mpp.AbstractMPPHandler[`+AbstractMPPHandler+`] to solve the chicken-egg initialization problem. When initializing DCS, we dynamically create an object implementing link:#patroni.postgresql.mpp.AbstractMPP[`+AbstractMPP+`], later this object is used to instantiate an object implementing link:#patroni.postgresql.mpp.AbstractMPPHandler[`+AbstractMPPHandler+`].
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\\__init\\__(_config:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/stdtypes.html#str[str] |  https://docs.python.org/3/library/functions.html#int[int]]_) →  https://docs.python.org/3/library/constants.html#None[None] https://github.com/zalando/patroni/blob/9d231aeecdd69f4d06c75a702755fa70d8c2b5f6/patroni/postgresql/mpp/\\__init\\__.py#L30-L35[View on GitHub]link:#patroni.postgresql.mpp.AbstractMPP.\\__init\\__[];;
  Init method for link:#patroni.postgresql.mpp.AbstractMPP[`+AbstractMPP+`].
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  Parameters:::
    *config* – configuration of MPP section.
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_abc_impl_ = <_abc._abc_data object>_link:#patroni.postgresql.mpp.AbstractMPP._abc_impl[];;
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_get_handler_cls() →  https://docs.python.org/3/library/typing.html#typing.Iterator[Iterator][ https://docs.python.org/3/library/typing.html#typing.Type[Type][link:#patroni.postgresql.mpp.AbstractMPPHandler[AbstractMPPHandler]]] https://github.com/zalando/patroni/blob/9d231aeecdd69f4d06c75a702755fa70d8c2b5f6/patroni/postgresql/mpp/\\__init\\__.py#L103-L110[View on GitHub]link:#patroni.postgresql.mpp.AbstractMPP._get_handler_cls[];;
  Find Handler classes inherited from a class type of this object.
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  Yields:::
    handler classes for this object.
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_abstract property _coordinator_group_id_:  https://docs.python.org/3/library/typing.html#typing.Any[Any]_link:#patroni.postgresql.mpp.AbstractMPP.coordinator_group_id[];;
  The group id of the coordinator PostgreSQL cluster.
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get_handler_impl(_postgresql: link:patroni.postgresql.html#patroni.postgresql.Postgresql[Postgresql]_) → link:#patroni.postgresql.mpp.AbstractMPPHandler[AbstractMPPHandler] https://github.com/zalando/patroni/blob/9d231aeecdd69f4d06c75a702755fa70d8c2b5f6/patroni/postgresql/mpp/\\__init\\__.py#L112-L124[View on GitHub]link:#patroni.postgresql.mpp.AbstractMPP.get_handler_impl[];;
  Find and instantiate Handler implementation of this object.
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  Parameters:::
    *postgresql* – a reference to `+Postgresql+` object.
  Raises:::
    `+PatroniException+`: if the Handler class haven’t been found.
  Returns:::
    an instantiated class that implements Handler for this object.
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_abstract property _group_:  https://docs.python.org/3/library/typing.html#typing.Any[Any]_link:#patroni.postgresql.mpp.AbstractMPP.group[];;
  The group for a given MPP implementation.
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group_re_:  https://docs.python.org/3/library/typing.html#typing.Any[Any]_link:#patroni.postgresql.mpp.AbstractMPP.group_re[];;
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is_coordinator() →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/9d231aeecdd69f4d06c75a702755fa70d8c2b5f6/patroni/postgresql/mpp/\\__init\\__.py#L87-L93[View on GitHub]link:#patroni.postgresql.mpp.AbstractMPP.is_coordinator[];;
  Check whether this node is running in the coordinator PostgreSQL cluster.
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  Returns:::
    `+True+` if MPP is enabled and the group id of this node matches with the link:#patroni.postgresql.mpp.AbstractMPP.coordinator_group_id[`+coordinator_group_id+`], otherwise `+False+`.
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is_enabled() →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/9d231aeecdd69f4d06c75a702755fa70d8c2b5f6/patroni/postgresql/mpp/\\__init\\__.py#L37-L46[View on GitHub]link:#patroni.postgresql.mpp.AbstractMPP.is_enabled[];;
  Check if MPP is enabled for a given MPP.
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  Note

  We just check that the `+_config+` object isn’t empty and expect it to be empty only in case of link:#patroni.postgresql.mpp.Null[`+Null+`].
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  Returns:::
    `+True+` if MPP is enabled, otherwise `+False+`.
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is_worker() →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/9d231aeecdd69f4d06c75a702755fa70d8c2b5f6/patroni/postgresql/mpp/\\__init\\__.py#L95-L101[View on GitHub]link:#patroni.postgresql.mpp.AbstractMPP.is_worker[];;
  Check whether this node is running as a MPP worker PostgreSQL cluster.
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  Returns:::
    `+True+` if MPP is enabled and this node is known to be not running as the coordinator PostgreSQL cluster, otherwise `+False+`.
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_property _k8s_group_labellink:#patroni.postgresql.mpp.AbstractMPP.k8s_group_label[];;
  Group label used for kubernetes DCS of the MPP cluster.
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  Returns:::
    A string representation of the k8s group label of a given MPP implementation.
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_property _type_:  https://docs.python.org/3/library/stdtypes.html#str[str]_link:#patroni.postgresql.mpp.AbstractMPP.type[];;
  The type of the MPP cluster.
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  Returns:::
    A string representation of the type of a given MPP implementation.
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_abstract static _validate_config(_config:  https://docs.python.org/3/library/typing.html#typing.Any[Any]_) →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/9d231aeecdd69f4d06c75a702755fa70d8c2b5f6/patroni/postgresql/mpp/\\__init\\__.py#L48-L56[View on GitHub]link:#patroni.postgresql.mpp.AbstractMPP.validate_config[];;
  Check whether provided config is good for a given MPP.
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  Parameters:::
    *config* – configuration of MPP section.
  Returns:::
    `+True+` is config passes validation, otherwise `+False+`.