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- sh.removeShardFromZone()
sh.removeShardFromZone()¶
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Definition¶
- sh.removeShardFromZone(shard, zone)¶
3.4 新版功能.
Removes the association between a zone and a shard.
Parameter Type Description shard string The name of the shard from which to remove association with the zone. zone string The name of the zone from which to remove assocation with the shard. Only issue sh.removeShardFromZone() when connected to a mongos instance.
Behavior¶
sh.removeShardFromZone() does not remove ranges associated with the zone.
To completely remove a zone from the cluster, you must run sh.removeShardFromZone() on each shard associated with the zone.
If the shard specified is the last shard associated with the zone, you must ensure there are no remaining ranges associated with the zone. Use updateZoneKeyRange to remove any existing ranges associated to the zone before running sh.removeShardFromZone().
See the zone manual page for more information on zones in sharded clusters.
Balancer¶
Removing the association between a zone and a shard removes the constraints keeping chunks covered by the zone on the shard. During the next balancer round, the balancer may migrate chunks that previously covered by the zone.
See the the sharded cluster balancer manual page for more information on how migrations work in a sharded cluster.
Security¶
For sharded clusters running with authentication, you must authenticate as a user whose privileges include:
- update on the config.shards collection or the config database
- find on the config.tags collection or the config database
The clusterAdmin or clusterManager built-in roles have the appropriate permissions for issuing sh.removeShardFromZone(). See the Role-Based Access Control manual page for more information.
Example¶
The following example removes the association between shard0000 and the NYC zone:
sh.removeShardFromZone("shard0000", "NYC")