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The ALTER RANGE statement applies a schema change to a range.
Required privileges
Refer to the respective subcommands.
Synopsis
Parameters
| Parameter | Description |
|---|---|
range_id |
The name or ID of the range you want to change. |
Additional parameters are documented for the respective subcommands.
Subcommands
| Subcommand | Description |
|---|---|
CONFIGURE ZONE |
Replication Controls for a database. |
RELOCATE |
Move a lease or replica between stores in an emergency situation. |
CONFIGURE ZONE
ALTER RANGE ... CONFIGURE ZONE is used to add, modify, reset, or remove replication zones for a range. To view details about existing replication zones, see SHOW ZONE CONFIGURATIONS.
You can use replication zones to control the number and location of replicas for specific sets of data, both when replicas are first added and when they are rebalanced to maintain cluster equilibrium.
Required privileges
The user must be a member of the admin role or have been granted CREATE or ZONECONFIG privileges. To configure system objects, the user must be a member of the admin role.
Parameters
| Parameter | Description |
|---|---|
variable |
The name of the replication zone variable to change. |
value |
The value of the replication zone variable to change. |
DISCARD |
Remove a replication zone. |
For usage, see Synopsis.
RELOCATE
ALTER RANGE ... RELOCATE is used to move a lease or replica between stores. This is helpful in an emergency situation to relocate data in the cluster.
Warning:
Most users should not need to use this statement; it is for use in emergency situations. If you are in an emergency situation where you think using this statement may help, Cockroach Labs recommends contacting support.
Required privileges
To alter a range and move a lease or replica between stores, the user must have one of the following:
- Membership to the
adminrole for the cluster.
Parameters
| Parameter | Description |
|---|---|
LEASE |
Move leases. |
VOTERS |
Move voting replicas only. |
NONVOTERS |
Move non-voting replicas only. |
FROM a_expr |
Move a replica from a store ID. |
TO a_expr |
Move a lease or replica to a new store ID. |
select_stmt |
A selection query that produces one or more rows. |
For usage, see Synopsis.
Examples
Configure replication zones
Create a replication zone for a system range
In addition to the databases and tables that are visible via the SQL interface, CockroachDB stores internal data in what are called system ranges. CockroachDB comes with pre-configured replication zones for some of these ranges:
| Target Name | Description |
|---|---|
meta |
The "meta" ranges contain the authoritative information about the location of all data in the cluster. These ranges must retain a majority of replicas for the cluster as a whole to remain available and historical queries are never run on them, so CockroachDB comes with a pre-configured meta replication zone with num_replicas set to 5 to make these ranges more resilient to node failure and a lower-than-default gc.ttlseconds to keep these ranges smaller for reliable performance.If your cluster is running in multiple datacenters, it's a best practice to configure the meta ranges to have a copy in each datacenter. |
liveness |
The "liveness" range contains the authoritative information about which nodes are live at any given time. These ranges must retain a majority of replicas for the cluster as a whole to remain available and historical queries are never run on them, so CockroachDB comes with a pre-configured liveness replication zone with num_replicas set to 5 to make these ranges more resilient to node failure and a lower-than-default gc.ttlseconds to keep these ranges smaller for reliable performance. |
system |
There are system ranges for a variety of other important internal data, including information needed to allocate new table IDs and track the status of a cluster's nodes. These ranges must retain a majority of replicas for the cluster as a whole to remain available, so CockroachDB comes with a pre-configured system replication zone with num_replicas set to 5 to make these ranges more resilient to node failure. |
timeseries |
The "timeseries" ranges contain monitoring data about the cluster that powers the graphs in CockroachDB's DB Console. If necessary, you can add a timeseries replication zone to control the replication of this data. |
Warning:
Use caution when editing replication zones for system ranges, as they could cause some (or all) parts of your cluster to stop working.
To control replication for one of the above sets of system ranges, use the ALTER RANGE ... CONFIGURE ZONE statement to define the relevant values (other values will be inherited from the parent zone):
> ALTER RANGE meta CONFIGURE ZONE USING num_replicas = 7;
CONFIGURE ZONE 1
> SHOW ZONE CONFIGURATION FROM RANGE meta;
target | raw_config_sql
+------------+---------------------------------------+
RANGE meta | ALTER RANGE meta CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 3600,
| num_replicas = 7,
| constraints = '[]',
| lease_preferences = '[]'
(1 row)
Move lease or replica
Find the cluster store IDs
To use ALTER RANGE ... RELOCATE, you will need to know your cluster's store IDs. To get the store IDs, run the following statement:
SELECT store_id FROM crdb_internal.kv_store_status;
store_id
-----------
1
2
3
4
5
6
7
8
9
(9 rows)
Find range ID and leaseholder information
To use ALTER RANGE ... RELOCATE, you need to know how to find the range ID, leaseholder, and other information for a table, index, or database. You can find this information using the SHOW RANGES statement.
For example, to get all range IDs, leaseholder store IDs, and leaseholder localities for the movr.users table, use the following query:
WITH user_info AS (SHOW RANGES FROM TABLE users) SELECT range_id, lease_holder, lease_holder_locality FROM user_info;
range_id | lease_holder | lease_holder_locality
-----------+--------------+---------------------------
70 | 3 | region=us-east1,az=d
67 | 9 | region=europe-west1,az=d
66 | 3 | region=us-east1,az=d
65 | 3 | region=us-east1,az=d
69 | 3 | region=us-east1,az=d
45 | 2 | region=us-east1,az=c
50 | 2 | region=us-east1,az=c
46 | 2 | region=us-east1,az=c
49 | 2 | region=us-east1,az=c
(9 rows)
Move the lease for a range to a specified store
To move the lease for range ID 70 to store ID 4:
ALTER RANGE 70 RELOCATE LEASE TO 4;
range_id | pretty | result
-----------+------------+---------
70 | /Table/106 | ok
(1 row)
Move the lease for all of a table's ranges to a store
To move the leases for all data in the movr.users table to a specific store:
ALTER RANGE RELOCATE LEASE TO 2 FOR SELECT range_id from crdb_internal.ranges where table_name = 'users'
range_id | pretty | result
-----------+----------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
70 | /Table/106 | unable to find store 2 in range r70:/Table/106{-/1/"amsterdam"/"\xb333333@\x00\x80\x00\x00\x00\x00\x00\x00#"} [(n7,s7):1, (n3,s3):4, (n4,s4):5, next=6, gen=27]
67 | /Table/106/1/"amsterdam"/"\xb333333@\x00\x80\x00\x00\x00\x00\x00\x00#" | unable to find store 2 in range r67:/Table/106/1/"{amsterdam"/"\xb333333@\x00\x80\x00\x00\x00\x00\x00\x00#"-boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n"} [(n3,s3):4, (n9,s9):6, (n6,s6):7, next=8, gen=34, sticky=9223372036.854775807,2147483647]
66 | /Table/106/1/"boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n" | unable to find store 2 in range r66:/Table/106/1/"{boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n"-los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e"} [(n7,s7):1, (n3,s3):4, (n4,s4):5, next=6, gen=25, sticky=9223372036.854775807,2147483647]
65 | /Table/106/1/"los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e" | unable to find store 2 in range r65:/Table/106/1/"{los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e"-new york"/"\x19\x99\x99\x99\x99\x99J\x00\x80\x00\x00\x00\x00\x00\x00\x05"} [(n7,s7):1, (n3,s3):4, (n4,s4):5, next=6, gen=25, sticky=9223372036.854775807,2147483647]
69 | /Table/106/1/"new york"/"\x19\x99\x99\x99\x99\x99J\x00\x80\x00\x00\x00\x00\x00\x00\x05" | unable to find store 2 in range r69:/Table/106/1/"{new york"/"\x19\x99\x99\x99\x99\x99J\x00\x80\x00\x00\x00\x00\x00\x00\x05"-paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00("} [(n9,s9):5, (n3,s3):4, (n4,s4):3, next=6, gen=29, sticky=9223372036.854775807,2147483647]
45 | /Table/106/1/"paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00(" | ok
50 | /Table/106/1/"san francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19" | ok
46 | /Table/106/1/"seattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14" | ok
49 | /Table/106/1/"washington dc"/"L\xcc\xcc\xcc\xcc\xccL\x00\x80\x00\x00\x00\x00\x00\x00\x0f" | ok
(9 rows)
When it isn't possible to move a lease for a range to the specified store, the result column will show the message unable to find store ... as shown above.
Move a replica from one store to another store
If you know the store where a range's replica is located, you can move it to another store:
ALTER RANGE 45 RELOCATE FROM 2 to 4;
range_id | pretty | result
-----------+-----------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
45 | /Table/106/1/"paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00(" | removing learners from r45:/Table/106/1/"{paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00("-san francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19"} [(n2,s2):1LEARNER, (n8,s8):2, (n5,s5):3, (n4,s4):4, next=5, gen=14, sticky=9223372036.854775807,2147483647]: change replicas of r45 failed: descriptor changed: [expected] r45:/Table/106/1/"{paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00("-san francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19"} [(n2,s2):1LEARNER, (n8,s8):2, (n5,s5):3, (n4,s4):4, next=5, gen=14, sticky=9223372036.854775807,2147483647] != [actual] r45:/Table/106/1/"{paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00("-san francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19"} [(n4,s4):4, (n8,s8):2, (n5,s5):3, next=5, gen=15, sticky=9223372036.854775807,2147483647]
(1 row)
Move all of a table's replicas on one store to another store
To move the replicas for all data in the movr.users table on one store to another store:
ALTER RANGE RELOCATE FROM 2 TO 7 FOR SELECT range_id from crdb_internal.ranges where table_name = 'users';
range_id | pretty | result
-----------+----------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
70 | /Table/106 | trying to add a voter to a store that already has a VOTER_FULL
67 | /Table/106/1/"amsterdam"/"\xb333333@\x00\x80\x00\x00\x00\x00\x00\x00#" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_VOTER Target:n2,s2}
66 | /Table/106/1/"boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n" | trying to add a voter to a store that already has a VOTER_FULL
65 | /Table/106/1/"los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e" | trying to add a voter to a store that already has a VOTER_FULL
69 | /Table/106/1/"new york"/"\x19\x99\x99\x99\x99\x99J\x00\x80\x00\x00\x00\x00\x00\x00\x05" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_VOTER Target:n2,s2}
45 | /Table/106/1/"paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00(" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_VOTER Target:n2,s2}
50 | /Table/106/1/"san francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19" | change replicas of r50 failed: descriptor changed: [expected] r50:/Table/106/1/"s{an francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19"-eattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14"} [(n2,s2):1, (n8,s8):2, (n5,s5):3, (n7,s7):4LEARNER, next=5, gen=12, sticky=9223372036.854775807,2147483647] != [actual] r50:/Table/106/1/"s{an francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19"-eattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14"} [(n2,s2):1, (n8,s8):2, (n5,s5):3, next=5, gen=13, sticky=9223372036.854775807,2147483647]
46 | /Table/106/1/"seattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14" | removing learners from r46:/Table/106/1/"{seattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14"-washington dc"/"L\xcc\xcc\xcc\xcc\xccL\x00\x80\x00\x00\x00\x00\x00\x00\x0f"} [(n2,s2):1LEARNER, (n8,s8):2, (n5,s5):3, (n7,s7):4, next=5, gen=14, sticky=9223372036.854775807,2147483647]: change replicas of r46 failed: descriptor changed: [expected] r46:/Table/106/1/"{seattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14"-washington dc"/"L\xcc\xcc\xcc\xcc\xccL\x00\x80\x00\x00\x00\x00\x00\x00\x0f"} [(n2,s2):1LEARNER, (n8,s8):2, (n5,s5):3, (n7,s7):4, next=5, gen=14, sticky=9223372036.854775807,2147483647] != [actual] r46:/Table/106/1/"{seattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14"-washington dc"/"L\xcc\xcc\xcc\xcc\xccL\x00\x80\x00\x00\x00\x00\x00\x00\x0f"} [(n7,s7):4, (n8,s8):2, (n5,s5):3, next=5, gen=15, sticky=9223372036.854775807,2147483647]
49 | /Table/106/1/"washington dc"/"L\xcc\xcc\xcc\xcc\xccL\x00\x80\x00\x00\x00\x00\x00\x00\x0f" | ok
(9 rows)
See the result column in the output for the status of the operation. If it's ok, the replica was moved with no issues. Other messages will indicate whether the target store is already full (VOTER_FULL), or if the replica you're trying to remove doesn't exist.
Move all of a range's voting replicas from one store to another store
To move all of a range's voting replicas from one store to another store:
ALTER RANGE RELOCATE VOTERS FROM 7 TO 2 FOR SELECT range_id from crdb_internal.ranges where table_name = 'users';
range_id | pretty | result
-----------+----------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
70 | /Table/106 | ok
67 | /Table/106/1/"amsterdam"/"\xb333333@\x00\x80\x00\x00\x00\x00\x00\x00#" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_VOTER Target:n7,s7}
66 | /Table/106/1/"boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n" | removing learners from r66:/Table/106/1/"{boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n"-los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e"} [(n7,s7):1LEARNER, (n3,s3):4, (n4,s4):5, (n2,s2):6, next=7, gen=28, sticky=9223372036.854775807,2147483647]: change replicas of r66 failed: descriptor changed: [expected] r66:/Table/106/1/"{boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n"-los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e"} [(n7,s7):1LEARNER, (n3,s3):4, (n4,s4):5, (n2,s2):6, next=7, gen=28, sticky=9223372036.854775807,2147483647] != [actual] r66:/Table/106/1/"{boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n"-los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e"} [(n2,s2):6, (n3,s3):4, (n4,s4):5, next=7, gen=29, sticky=9223372036.854775807,2147483647]
65 | /Table/106/1/"los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e" | ok
69 | /Table/106/1/"new york"/"\x19\x99\x99\x99\x99\x99J\x00\x80\x00\x00\x00\x00\x00\x00\x05" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_VOTER Target:n7,s7}
45 | /Table/106/1/"paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00(" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_VOTER Target:n7,s7}
50 | /Table/106/1/"san francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19" | trying to add a voter to a store that already has a VOTER_FULL
46 | /Table/106/1/"seattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14" | trying to add a voter to a store that already has a VOTER_FULL
49 | /Table/106/1/"washington dc"/"L\xcc\xcc\xcc\xcc\xccL\x00\x80\x00\x00\x00\x00\x00\x00\x0f" | trying to add a voter to a store that already has a VOTER_FULL
(9 rows)
See the result column in the output for the status of the operation. If it's ok, the replica was moved with no issues. Other messages will indicate whether the target store is already full (VOTER_FULL), or if the replica you're trying to remove doesn't exist.
Move all of a range's non-voting replicas from one store to another store
To move a range's non-voting replicas, use the statement below.
Note:
This statement will only have an effect on clusters that have non-voting replicas configured, such as multiregion clusters. If your cluster is not a multiregion cluster, it doesn't do anything, and will display errors in the result field as shown below.
ALTER RANGE RELOCATE NONVOTERS FROM 7 TO 2 FOR SELECT range_id from crdb_internal.ranges where table_name = 'users';
range_id | pretty | result
-----------+----------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------
70 | /Table/106 | type of replica being removed (VOTER_FULL) does not match expectation for change: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
67 | /Table/106/1/"amsterdam"/"\xb333333@\x00\x80\x00\x00\x00\x00\x00\x00#" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
66 | /Table/106/1/"boston"/"333333D\x00\x80\x00\x00\x00\x00\x00\x00\n" | type of replica being removed (VOTER_FULL) does not match expectation for change: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
65 | /Table/106/1/"los angeles"/"\x99\x99\x99\x99\x99\x99H\x00\x80\x00\x00\x00\x00\x00\x00\x1e" | type of replica being removed (VOTER_FULL) does not match expectation for change: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
69 | /Table/106/1/"new york"/"\x19\x99\x99\x99\x99\x99J\x00\x80\x00\x00\x00\x00\x00\x00\x05" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
45 | /Table/106/1/"paris"/"\xcc\xcc\xcc\xcc\xcc\xcc@\x00\x80\x00\x00\x00\x00\x00\x00(" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
50 | /Table/106/1/"san francisco"/"\x80\x00\x00\x00\x00\x00@\x00\x80\x00\x00\x00\x00\x00\x00\x19" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
46 | /Table/106/1/"seattle"/"ffffffH\x00\x80\x00\x00\x00\x00\x00\x00\x14" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
49 | /Table/106/1/"washington dc"/"L\xcc\xcc\xcc\xcc\xccL\x00\x80\x00\x00\x00\x00\x00\x00\x0f" | trying to remove a replica that doesn't exist: {ChangeType:REMOVE_NON_VOTER Target:n7,s7}
(9 rows)
See also
- Replication Controls
- Multiregion Capabilities Overview
- Troubleshoot cluster setup
- Replication Layer
- SQL Statements
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