The sharding.rebalancer_mode option

[TarantoolBot]

Related dev. issue(s): tarantool/tarantool#9657

Product: Tarantool, vshard
Since: 3.1
Root document:

• https://www.tarantool.io/en/doc/latest/reference/configuration/configuration_reference/#sharding
• https://www.tarantool.io/en/doc/latest/book/admin/vshard_admin/

SME: @ ImeevMA

Details

The sharding.rebalancer_mode option can have one of three values:
manual, auto and off. Default value is auto.

If the option is set to manual, one of the replicasets must have the
rebalancer sharding role. The rebalancer will be in this replicaset.

If the option value is auto and there are no replicasets with the
sharding role rebalancer, the replicaset with rebalancer will
be selected automatically among all replicasets. If the value of the
parameter is auto and one of the replicasets has the sharding role
rebalancer, then the rebalancer will be in that replicaset.

If the option value is off, rebalancing will be disabled regardless of
whether a replicaset with the sharding role rebalancer exists or no
such replicaset exists.
Requested by @ ImeevMA in tarantool/tarantool@80a9bb2.