ALTER RANGE ... RELOCATE

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The ALTER RANGE ... RELOCATE statement is a subcommand of ALTER RANGE. It 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.

Note:

The ALTER RANGE ... RELOCATE statement performs a schema change. For more information about how online schema changes work in CockroachDB, see Online Schema Changes.

Note:

If you prefer to use a key based approach to relocating replicas and leases, see the experimental ALTER TABLE ... EXPERIMENTAL_RELOCATE statement.

Synopsis

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 admin role for the cluster.

Examples

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:

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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:

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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:

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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:

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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:

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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:

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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:

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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.

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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)

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