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English
box.cfg({
election_mode = <string>,
election_fencing_mode = <string>,
election_timeout = <seconds>,
replication_timeout = <seconds>,
replication_synchro_quorum = <count>
})
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Managing leader elections
 
Starting from version :doc:`2.6.1 </release/2.6.1>`, Tarantool has the built-in functionality managing automated leader election in a replica set. Learn more about the :ref:`concept of leader election <repl_leader_elect>`.
 
Configuration
Настройка
box.cfg({
election_mode = <string>,
election_fencing_mode = <string>,
election_timeout = <seconds>,
replication_timeout = <seconds>,
replication_synchro_quorum = <count>
})
box.cfg({
election_mode = <string>,
election_timeout = <seconds>,
replication_timeout = <seconds>,
replication_synchro_quorum = <count>,
})
``election_mode`` -- specifies the role of a node in the leader election process. For the details, refer to the :ref:`option description <cfg_replication-election_mode>` in the configuration reference.
``election_mode`` — определяет роль узла в процессе выборов лидера. Подробное :ref:`описание параметра <cfg_replication-election_mode>` приводится в справочнике по настройке.
``election_fencing_mode`` -- specifies the :ref:`leader fencing mode <repl_leader_elect_fencing>`. For the details, refer to the :ref:`option description <cfg_replication-election_fencing_mode>` in the configuration reference.
``election_mode`` — определяет роль узла в процессе выборов лидера. Подробное :ref:`описание параметра <cfg_replication-election_mode>` приводится в справочнике по настройке.
``election_timeout`` -- specifies the timeout between election rounds if the previous round ended up with a split vote. For the details, refer to the :ref:`option description <cfg_replication-election_timeout>` in the configuration reference.
``election_timeout`` — задает промежуток времени между турами в случае разделения голосов и последующих перевыборов. Подробное :ref:`описание параметра <cfg_replication-election_timeout>` приводится в справочнике по настройке.
``replication_timeout`` -- reuse of the :ref:`replication_timeout <cfg_replication-replication_timeout>` configuration option for the purpose of the leader election process. Heartbeats sent by an active leader have a timeout after which a new election starts. Heartbeats are sent once per <replication_timeout> seconds. The default value is ``1``. The leader is considered dead if it hasn't sent any heartbeats for the period of ``replication_timeout * 4``.
``replication_timeout`` — параметр репликации :ref:`replication_timeout <cfg_replication-replication_timeout>`, используемый для выборов лидера. Активный лидер отправляет сообщения контрольного сигнала каждые <replication_timeout> секунд. Значение параметра по умолчанию — ``1``. Если лидер не отправляет сообщений контрольного сигнала в течение ``<replication_timeout> * 4`` секунд, он считается недоступным (dead) и начинаются новые выборы.
``replication_synchro_quorum`` -- reuse of the :ref:`replication_synchro_quorum <cfg_replication-replication_synchro_quorum>` option for the purpose of configuring the election quorum. The default value is ``1``, meaning that each node becomes a leader immediately after voting for itself. It is best to set up this option value to the ``(<cluster size> / 2) + 1``. Otherwise, there is no guarantee that there is only one leader at a time.
``replication_synchro_quorum`` — параметр репликации :ref:`replication_synchro_quorum <cfg_replication-replication_synchro_quorum>`, используемый для настройки кворума. Значение по умолчанию — ``1``, то есть каждый узел, проголосовав за себя, немедленно становится лидером. Лучше всего задать этому параметру значение ``(<размер кластера> / 2) + 1``. В противном случае нет гарантий, что в каждый момент времени в кластере будет только один лидер.
It is important to know that being a leader is not the only requirement for a node to be writable. The leader should also satisfy the following requirements:
 
The :ref:`read_only <cfg_basic-read_only>` option is set to ``false``.
 
The leader shouldn't be in the orphan state.
 
Nothing prevents you from setting the ``read_only`` option to ``true``, but the leader just won't be writable then. The option doesn't affect the election process itself, so a read-only instance can still vote and become a leader.
Ничто не мешает задать для параметра ``read_only`` значение ``true``, но это сделает лидера недоступным для записи. На сам процесс выборов параметр никак не влияет, поэтому голосовать и быть лидером может даже экземпляр, доступный только для чтения.
Monitoring
Мониторинг
To monitor the current state of a node regarding the leader election, you can use the ``box.info.election`` function. For details, refer to the :doc:`function description </reference/reference_lua/box_info/election>`.
Чтобы отслеживать текущий статус узла в выборах лидера, можно использовать функцию ``box.info.election``. Подробные сведения читайте в :doc:`описании функции </reference/reference_lua/box_info/election>`.
**Example:**
**Пример:**
tarantool> box.info.election
---
- state: follower
vote: 0
leader: 0
term: 1
...
tarantool> box.info.election
---
- state: follower
vote: 0
leader: 0
term: 1
...
The Raft-based election implementation logs all its actions with the ``RAFT:`` prefix. The actions are new Raft message handling, node state changing, voting, and term bumping.
Журнальные записи о выборах на основе алгоритма Raft отмечаются префиксом ``RAFT:``. В журнал вносятся такие события, как обработка новых сообщений Raft, изменение статуса узла, голосование, увеличение значения терма и пр.
Important notes
Важные замечания

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String updated in the repository

testing_project / Documentation: how-to/replication/repl_leader_elect — Russian

box.cfg({
election_mode = <string>,
election_fencing_mode = <string>,
election_timeout = <seconds>,
replication_timeout = <seconds>,
replication_synchro_quorum = <count>
})
box.cfg({
election_mode = <string>,
election_timeout = <seconds>,
replication_timeout = <seconds>,
replication_synchro_quorum = <count>,
})
a year ago
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locale/ru/LC_MESSAGES/how-to/replication/repl_leader_elect.po, string 4