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Type: string
Default: 'on'
Replica set parameters
:ref:`uuid <cfg_replica_set-uuid>`
:ref:`weight <cfg_replica_set-weight>`
:ref:`master <cfg_replica_set-master>`
A unique identifier of a replica set.
Type:
Default:
Dynamic:
A weight of a replica set. See the :ref:`Replica set weights <vshard-replica-set-weights>` section for details.
Turns on automated master discovery in a replica set if set to ``auto``. Applicable only to the configuration of a router; the storage configuration ignores this parameter.
The parameter should be specified per replica set. The configuration is not compatible with a manual master selection.
**Examples**
Correct configuration:
config = {
sharding = {
<replicaset uuid> = {
master = 'auto',
replicas = {...},
},
...
},
...
}
Incorrect configuration:
config = {
sharding = {
<replicaset uuid> = {
master = 'auto',
replicas = {
<replica uuid1> = {
master = true,
...
},
<replica uuid2> = {
master = false,
...
},
},
},
...
},
...
}
If the configuration is incorrect, it is not applied, and the ``vshard.router.cfg()`` call throws an error.
If the ``master`` parameter is set to ``auto`` for some replica sets, the router goes to these replica sets, discovers the master in each of them, and periodically checks if the master instance still has its master status. When the master in the replica set stops being a master, the router goes around all the nodes of the replica set to find out which one is the new master.
Without this setting, the router cannot detect master nodes in the configured replica sets on its own. It relies only on how they are specified in the configuration. This becomes a problem when the master changes, and the change is not delivered to the router's configuration: for instance, in case the router doesn't rely on a central configuration provider or the provider cannot deliver a new configuration due to some reason.
Default: ``nil``

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testing_project / Documentation: reference/reference_rock/vshard/vshard_ref — English

config = {
sharding = {
<replicaset uuid> = {
master = 'auto',
replicas = {...},
},
...
},
...
}
a year ago
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string 61