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Sharding Methods

sh.removeShardFromZone()

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  • Definition
  • Behavior
  • Example

Definition

sh.removeShardFromZone(shard, zone)

Removes the association between a zone and a shard.

Important

mongosh Method

This page documents a mongosh method. This is not the documentation for database commands or language-specific drivers, such as Node.js.

For the database command, see the removeShardFromZone command.

For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.

For the legacy mongo shell documentation, refer to the documentation for the corresponding MongoDB Server release:

This method has the following parameters:

Parameter
Type
Description
string

The name of the shard from which to remove the zone association.

string

The name of the zone whose association with the shard you want to remove.

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 sharded cluster balancer manual page for more information on how migrations work in a sharded cluster.

Security

For sharded clusters that enforce access control, you must authenticate either as:

  • a user whose privileges include:

    • update on the shards collection in the config database, and

    • find on the tags collection in the config database;

    or, alternatively,

  • a user whose privileges include enableSharding on the cluster resource (available starting in version 4.2.2, 4.0.14, 3.6.16).

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")

Tip

See also:

sh.addShardToZone() sh.updateZoneKeyRange() sh.removeRangeFromZone()

Back

sh.removeShardTag()