Module cartridge.lua-api.failover

get_params ()

Get failover configuration.

(Added in v2.0.2-2)

Returns:

(FailoverParams)

set_params (opts)

Configure automatic failover.

(Added in v2.0.2-2)

Parameters:

• opts:
  • mode: (optional string)
  • state_provider: (optional string)
  • failover_timeout: (optional number) (added in v2.3.0-52)
  • tarantool_params: (optional table)
  • etcd2_params: (optional table) (added in v2.1.2-26)
  • fencing_enabled: (optional boolean) (added in v2.3.0-57)
  • fencing_timeout: (optional number) (added in v2.3.0-57)
  • fencing_pause: (optional number) (added in v2.3.0-57)

Returns:

(boolean) true if config applied successfully

Or

(nil)

(table) Error description

get_failover_enabled ()

Get current failover state.

(Deprecated since v2.0.2-2)

set_failover_enabled (enabled)

Enable or disable automatic failover.

(Deprecated since v2.0.2-2)

Parameters:

• enabled: (boolean)

Returns:

(boolean) New failover state

Or

(nil)

(table) Error description

promote (replicaset_uuid[, opts])

Promote leaders in replicasets.

Parameters:

• replicaset_uuid: (table) ] = leader_uuid }
• opts:
  • force_inconsistency: (optional boolean) (default: false)
  • skip_error_on_change: (optional boolean) Skip etcd error if vclockkeeper was changed between calls (default: false)

Returns:

(boolean) true On success

Or

(nil)

(table) Error description

FailoverParams

Failover parameters.

(Added in v2.0.2-2)

Fields:

• mode: (string) Supported modes are «disabled», «eventual» and «stateful»
• state_provider: (optional string) Supported state providers are «tarantool» and «etcd2».
• failover_timeout: (number) (added in v2.3.0-52)Timeout (in seconds), used by membership tomark suspect members as dead (default: 20)
• tarantool_params: (added in v2.0.2-2)
  • uri: (string)
  • password: (string)
• etcd2_params: (added in v2.1.2-26)
  • prefix: (string) Prefix used for etcd keys: <prefix>/lock and`<prefix>/leaders`
  • lock_delay: (optional number) Timeout (in seconds), determines lock’s time-to-live (default: 10)
  • endpoints: (optional table) URIs that are used to discover and to access etcd cluster instances.(default: {'http://localhost:2379', 'http://localhost:4001'} )
  • username: (optional string) (default: «»)
  • password: (optional string) (default: «»)
• fencing_enabled: (boolean) (added in v2.3.0-57)Abandon leadership when both the state provider quorum and atleast one replica are lost (suitable in stateful mode only,default: false)
• fencing_timeout: (number) (added in v2.3.0-57)Time (in seconds) to actuate fencing after the check fails(default: 10)
• fencing_pause: (number) (added in v2.3.0-57)The period (in seconds) of performing the check(default: 2)