The ability to backup a full cluster has been added and the syntax for incremental backups is simplified. Because of these two changes, basic backup usage is now sufficient for most CockroachDB clusters. However, you may want to control your backup and restore options more explicitly.
This doc provides information about how to take and restore locality-aware backups.
Locality-aware BACKUP is an Enterprise-only feature. However, you can take full backups without an Enterprise license.
You can create locality-aware backups such that each node writes files only to the backup destination that matches the node locality configured at node startup.
This is useful for:
- Reducing cloud storage data transfer costs by keeping data within cloud regions.
- Helping you comply with data domiciling requirements.
A locality-aware backup is specified by a list of URIs, each of which has a COCKROACH_LOCALITY URL parameter whose single value is either default or a single locality key-value pair such as region=us-east. At least one COCKROACH_LOCALITY must be the default. Given a list of URIs that together contain the locations of all of the files for a single locality-aware backup, RESTORE can read in that backup.
The locality query string parameters must be URL-encoded.
During locality-aware backups, backup file placement is determined by leaseholder placement, as each node is responsible for backing up the ranges for which it is the leaseholder. Nodes write files to the backup storage location whose locality matches their own node localities, with a preference for more specific values in the locality hierarchy. If there is no match, the default locality is used.
Create a locality-aware backup
For example, to create a locality-aware backup where nodes with the locality region=us-west write backup files to s3://us-west-bucket, and all other nodes write to s3://us-east-bucket by default, run:
> BACKUP TO
('s3://us-east-bucket?COCKROACH_LOCALITY=default', 's3://us-west-bucket?COCKROACH_LOCALITY=region%3Dus-west');
can be restored by running:
> RESTORE FROM ('s3://us-east-bucket', 's3://us-west-bucket');
Note that the first URI in the list has to be the URI specified as the default URI when the backup was created. If you have moved your backups to a different location since the backup was originally taken, the first URI must be the new location of the files originally written to the default location.
Restore from a locality-aware backup
You can create locality-aware backups such that each node writes files only to the backup destination that matches the node locality configured at node startup.
Given a list of URIs that together contain the locations of all of the files for a single locality-aware backup, RESTORE can read in that backup. Note that the list of URIs passed to RESTORE may be different from the URIs originally passed to BACKUP. This is because it's possible to move the contents of one of the parts of a locality-aware backup (i.e., the files written to that destination) to a different location, or even to consolidate all the files for a locality-aware backup into a single location.
When restoring a full backup, the cluster data is restored first, then the system table data "as is." This means that the restored zone configurations can point to regions that do not have active nodes in the new cluster. For example, if your full backup has the following zone configurations:
> ALTER PARTITION europe_west OF INDEX movr.public.rides@primary \
CONFIGURE ZONE USING constraints = '[+region=europe-west1]';
> ALTER PARTITION us_east OF INDEX movr.public.rides@primary \
CONFIGURE ZONE USING constraints = '[+region=us-east1]';
> ALTER PARTITION us_west OF INDEX movr.public.rides@primary \
CONFIGURE ZONE USING constraints = '[+region=us-west1]';
And the restored cluster does not have nodes with the locality region=us-west1, the restored cluster will still have a zone configuration for us-west1. This means that the cluster's data will not be reshuffled to us-west1 because the region does not exist. The data will be distributed as if the zone configuration does not exist. For the data to be distributed correctly, you can add node(s) with the missing region or remove the zone configuration.
RESTORE is not truly locality-aware; while restoring from backups, a node may read from a store that does not match its locality. This can happen in the cases that either the BACKUP or RESTORE was not full cluster. Note that during a locality-aware restore, some data may be temporarily located on another node before it is eventually relocated to the appropriate node. To avoid this, you can manually restore zone configurations from a locality-aware backup.
Create an incremental locality-aware backup
To create an incremental locality-aware backup from a full locality-aware backup, the syntax the same as it is for regular incremental backups. If you backup to a destination already containing a full backup, an incremental backup will be appended to the full backup in a subdirector. For example:
> BACKUP TO
('s3://us-east-bucket?COCKROACH_LOCALITY=default', 's3://us-west-bucket?COCKROACH_LOCALITY=region%3Dus-west');
It is recommend that the same localities be included for every incremental backup in the series of backups; however, only the default locality is required. When restoring from an incremental locality-aware backup, you need to include every locality ever used, even if it was only used once.
And if you want to explicitly control where your incremental backups go, use the INCREMENTAL FROM syntax:
> BACKUP TO (${uri_1}, ${uri_2}, ...) INCREMENTAL FROM ${full_backup_uri} ...;
For example, to create an incremental locality-aware backup from a previous full locality-aware backup where nodes with the locality region=us-west write backup files to s3://us-west-bucket, and all other nodes write to s3://us-east-bucket by default, run:
> BACKUP TO \
('s3://us-east-bucket/test-cluster-2019-10-08-nightly?COCKROACH_LOCALITY=default', 's3://us-west-bucket/test-cluster-2019-10-08-nightly?COCKROACH_LOCALITY=region%3Dus-west')
INCREMENTAL FROM 's3://us-east-bucket/test-cluster-2019-10-07-weekly';
Note that only the backup URIs you set as the default when you created the previous backup(s) are needed in the INCREMENTAL FROM clause of your incremental BACKUP statement (as shown in the example). This is because the default destination for a locality-aware backup contains a manifest file that contains all the metadata required to create additional incremental backups based on it.
Restore from an incremental locality-aware backup
A locality-aware backup URI can also be used in place of any incremental backup URI in RESTORE.
For example, an incremental locality-aware backup created with
> BACKUP TO
('s3://us-east-bucket/database-bank-2019-10-08-nightly?COCKROACH_LOCALITY=default', 's3://us-west-bucket/database-bank-2019-10-08-nightly?COCKROACH_LOCALITY=region%3Dus-west')
INCREMENTAL FROM
's3://us-east-bucket/database-bank-2019-10-07-weekly';
can be restored by running:
> RESTORE FROM
('s3://us-east-bucket/database-bank-2019-10-07-weekly', 's3://us-west-bucket/database-bank-2019-10-07-weekly'),
('s3://us-east-bucket/database-bank-2019-10-08-nightly', 's3://us-west-bucket/database-bank-2019-10-08-nightly');
When restoring from an incremental locality-aware backup, you need to include every locality ever used, even if it was only used once.
Create an incremental locality-aware backup from a previous locality-aware backup
To make an incremental locality-aware backup from another locality-aware backup, the syntax is as follows:
> BACKUP TO ({uri_1}, {uri_2}, ...) INCREMENTAL FROM {full_backup}, {incr_backup_1}, {incr_backup_2}, ...;
For example, let's say you normally run a full backup every Monday, followed by incremental backups on the remaining days of the week.
By default, all nodes send their backups to your s3://us-east-bucket, except for nodes in region=us-west, which will send their backups to s3://us-west-bucket.
If today is Thursday, October 10th, 2019, your BACKUP statement will list the following backup URIs:
- The full locality-aware backup URI from Monday, e.g.,
s3://us-east-bucket/test-cluster-2019-10-07-weekly
- The incremental backup URIs from Tuesday and Wednesday, e.g.,
s3://us-east-bucket/test-cluster-2019-10-08-nightlys3://us-east-bucket/test-cluster-2019-10-09-nightly
Given the above, to take the incremental locality-aware backup scheduled for today (Thursday), you will run:
> BACKUP TO
('s3://us-east-bucket/test-cluster-2019-10-10-nightly?COCKROACH_LOCALITY=default', 's3://us-west-bucket/test-cluster-2019-10-10-nightly?COCKROACH_LOCALITY=region%3Dus-west')
INCREMENTAL FROM
's3://us-east-bucket/test-cluster-2019-10-07-weekly',
's3://us-east-bucket/test-cluster-2019-10-08-nightly',
's3://us-east-bucket/test-cluster-2019-10-09-nightly';
Note that only the backup URIs you set as the default when you created the previous backup(s) are needed in the INCREMENTAL FROM clause of your incremental BACKUP statement (as shown in the example). This is because the default destination for a locality-aware backup contains a manifest file that contains all the metadata required to create additional incremental backups based on it.
Manually restore zone configurations from a locality-aware backup
During a locality-aware restore, some data may be temporarily located on another node before it is eventually relocated to the appropriate node. To avoid this, you need to manually restore zone configurations first:
Once the locality-aware restore has started, pause the restore:
> PAUSE JOB 27536791415282;
The system.zones table stores your cluster's zone configurations, which will prevent the data from rebalancing. To restore them, you must restore the system.zones table into a new database because you cannot drop the existing system.zones table:
> RESTORE system.zones \
FROM 'azure://acme-co-backup?AZURE_ACCOUNT_KEY=hash&AZURE_ACCOUNT_NAME=acme-co' \
WITH into_db = 'newdb';
After it's restored into a new database, you can write the restored zones table data to the cluster's existing system.zones table:
> INSERT INTO system.zones SELECT * FROM newdb.zones;
Then drop the temporary table you created:
> DROP TABLE newdb.zones;
Then, resume the restore:
> RESUME JOB 27536791415282;
See also
BACKUPRESTORE- Take Full and Incremental Backups
- Take and Restore Encrypted Backups
- Take Backups with Revision History and Restore from a Point-in-time
SQL DUMPIMPORT- Use the Built-in SQL Client
- Other Cockroach Commands
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