FORCE RESTORE

Forces the restoration of a specific backup even if that backup is incomplete. Requires a target keyspace or a list of target tables within that keyspace, and a backup store name. Custom backup store settings can be specified as can a new keyspace for restored data. Returns a UUID for the restore operation.

After a FORCE RESTORE, you must run a nodetool repair or schedule a manual nodesync on the node. See:

Synopsis

RESTORE <targets>
    FROM BACKUP <backup_id>
    FROM STORE <store_name>
    [ WITH settings=<settings> ]
    [ INTO <keyspace_name_new> ] ;
Legend
Syntax conventions Description

UPPERCASE

Literal keyword.

Lowercase

Not literal.

< >

Variable value. Replace with a user-defined value.

[]

Optional. Square brackets ([]) surround optional command arguments. Do not type the square brackets.

( )

Group. Parentheses ( ( ) ) identify a group to choose from. Do not type the parentheses.

|

Or. A vertical bar (|) separates alternative elements. Type any one of the elements. Do not type the vertical bar.

...

Repeatable. An ellipsis ( ... ) indicates that you can repeat the syntax element as often as required.

'<Literal string>'

Single quotation (') marks must surround literal strings in CQL statements. Use single quotation marks to preserve upper case.

{ <key> : <value> }

Map collection. Braces ({ }) enclose map collections or key value pairs. A colon separates the key and the value.

<datatype2

Set, list, map, or tuple. Angle brackets ( < > ) enclose data types in a set, list, map, or tuple. Separate the data types with a comma.

<cql_statement>;

End CQL statement. A semicolon (;) terminates all CQL statements.

[--]

Separate the command line options from the command arguments with two hyphens ( -- ). This syntax is useful when arguments might be mistaken for command line options.

' <<schema\> ... </schema\>> '

Search CQL only: Single quotation marks (') surround an entire XML schema declaration.

@<xml_entity>='<xml_entity_type>'

Search CQL only: Identify the entity and literal value to overwrite the XML element in the schema and solrConfig files.
targets

A full single keyspace or a list of tables within that keyspace. Tables are prefixed with the keyspace and multiple tables are separated by commas, for example, keyspace_1.my_table_1, keyspace_1.my_table_2.

store_name

Name of the backup store. Store names can use alphanumeric characters and underscores only. They are case insensitive.

keyspace_name_new

Name of the new keyspace into which the backup data should be restored. The keyspace must exist.

settings

A key/value list of settings particular to the store class. For example, for an FSBlobStore class:

settings = {'path':'/path/to/data', 'retention_time':'1w'}

Common settings for all store classes

The following settings can be used with any store class.

Setting Description Type Required

transfer_rate_limit_mbs

Maximum upload rate per node in MB per second.

int

false

retention_time

Time duration for which a snapshot is retained.

duration

false

retention_number

Number of snapshots retained.

int

false

The parameters retention_time and retention_number can be used individually or in combination. Setting either to 0 ignores the respective parameter.

The transfer_rate_limit_mbs setting is not supported for Composite backup stores.

Examples

Retain backup younger than one week:

'retention_time':'1w'

Retain a minimum of 3 full backup at any point in time:

'retention_number':3

Any non-full backup with a status of INCOMPLETE or QUORUM that occurs between the full snapshots is retained as well.

Retain a mininum of 3 full backups even if older than one week:

'retention_time':'1w','retention_number':3

If, for example, there happen to be four full backups within the retention_time window, all four are retained. If there are only two backups, however, the last backup older than the retention_time window will also be retained. In addition, any non-full backup with a status of INCOMPLETE or QUORUM that occurs between the full backups is retained as well.

FSBlobStore class settings

The following settings are applicable only to the FSBlobStore class.

Setting Description Type Required

path

Path where snapshots are stored. The directory must exist.

text

true

AzureBlobStore class settings

The following settings are applicable only to the AzureBlobStore class.

Setting Description Type Required

container

Azure container in which snapshots are stored.

text

true

endpoint

Azure endpoint. May be replaced with the Azure account name.

text

true

sas_token

The Azure sas_token.

text

true unless Azure Managed Identity authentication mechanism is in use.

GoogleCloudBlobStore class settings

The following settings are applicable only to the GoogleCloudBlobStore class.

Setting Description Type Required

bucket

Google Cloud bucket in which snaphots are stored.

text

true

client_email

Email address associated with the Google Cloud account.

text

false unless private_key is set

client_id

Client ID associated with the Google Cloud account.

text

false

private_key

Private key associated with the Google Cloud account.

text

false unless client_email is set

private_key_id

Private key ID of the <private_key> associated with the Google Cloud account.

text

false

project_id

Project ID associated with the Google Cloud bucket.

text

false

endpoint

Google Cloud Endpoint. See https://cloud.google.com/endpoints/docs/quickstart-endpoints.

text

false

Authentication details

If no credentials are set in the GoogleCloudBlobStore settings, Application Default Credentials (ADC) are used. Credentials are checked in the following order:

  1. ADC checks the environment variable, GOOGLE_APPLICATION_CREDENTIALS, and, if set, uses the referenced service account file.

  2. If GOOGLE_APPLICATION_CREDENTIALS is not set, ADC uses the default service account provided by the Compute Engine, Kubernetes Engine, App Engine, or Cloud Functions depending on the environment on which the application is running.

  3. If no credentials are found, an error occurs. See: https://cloud.google.com/docs/authentication/production.

S3BlobStore class settings

The following settings are applicable to only the S3BlobStore class.

Setting Description Type Required

bucket

AWS bucket in which snapshots are stored.

text

true

region

AWS region, an alternative to the <endpoint> setting.

text

true if endpoint is not set

access_key

Access key used for authentication.

text

false

secret_key

Secret key used for authentication.

text

false

default_socket_timeout

Socket timeout in ms.Default: 50,000

int

false

max_error_retry

Maximum retries when an error occurs.Default: 3

int

false

default_throttle_retries

Enables retry throttling.Default: true

int

false

server_side_encryption

Enable server-side encryption (AES256).Default: true

boolean

false

accelerated_mode_enabled

Enable AWS transfer acceleration. Only applicable to AWS S3. See https://docs.aws.amazon.com/AmazonS3/latest/dev/transfer-acceleration.html.Default: true

boolean

false

storage_class

Storage class in which Binary Large Objects (BLOBS) are stored. See https://aws.amazon.com/s3/storage-classes/.

text

false

canned_acl

Access Control List (ACL) for buckets and objects.

text

false

endpoint

Endpoint for the AWS S3 server, an alternative to the <region> setting.

text

true if region is not set.

Authentication details

If no details are specified in the S3BlobStore settings, the DefaultAWSCredentialsProviderChain is used. The DefaultAWSCredentialsProviderChain searches for credentials in the following order:

  1. The environment variables, AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.

  2. The Java system properties, aws.accessKeyId and aws.secretKey.

  3. A credential profile located at ~/.aws/credentials.

  4. Credentials provided through the Amazon EC2 container service if the AWS_CONTAINER_CREDENTIALS_RELATIVE_URI environment variable is set and the security manager has permission to access that variable.

  5. Instance profile credentials delivered using the Amazon EC2 metadata service.

    CompositeStore class settings

    The following setting is applicable to only the CompositeStore class.

    Setting Description Type Required

    data-center-name

    The key must be a valid DSE datacenter name.

    text

    The value must be an existing configured backup store:

    • FSBlobStore

    • AzureBlobStore

    • GoogleCloudBlobStore

    • S3BlobStore

Examples

Restore a full keyspace backup

Restore a specific backup from a file system store class:

FORCE RESTORE keyspace_1
    FROM BACKUP backup_configuration_1-c0dfeb5b-323e-4e3d-8ebc-6948050e3e70
    FROM STORE fs_store_1;

02d2603a-7e22-11e9-8f9e-2a86e4085a59

Restore tables within a keyspace

Restore specific tables within a keyspace:

FORCE RESTORE keyspace_1.data_table_1, keyspace_1.data_table_2
    FROM BACKUP backup_configuration_1-c0dfeb5b-323e-4e3d-8ebc-6948050e3e70
    FROM STORE fs_store_1;

02d3333a-7e22-11e9-8f9e-2a86e4085a59

Restore a keyspace into a new keyspace

Restore a keyspace to a new keyspace:

FORCE RESTORE keyspace_1
    FROM BACKUP backup_configuration_1-c0dfeb5b-323e-4e3d-8ebc-6948050e3e70
    FROM STORE fs_store_1
    INTO KEYSPACE keyspace_2;

12f5533a-7e22-11e9-8f9e-2a86e4085a59

Restore a backup with custom store settings into a new cluster

On a node in a new cluster with the Backup and Restore Service enabled, restore a specific backup from an existing FSBlobStore backup store:

FORCE RESTORE keyspace_1
    FROM BACKUP backup_configuration_1-c0dfeb5b-323e-4e3d-8ebc-6948050e3e70
    USING 'FSBlobStore'
    WITH settings={'path': '/my/backup/path'};

12e2603b-7e22-11e9-8f9e-2a86e4085a62

The required settings for each backup store class are:

  • FSBlobStore: <path>

  • GoogleCloudBlobStore: <bucket>

  • S3BlobStore: <bucket> and <region> or <bucket> and <endpoint>

After a FORCE RESTORE, you must run a nodetool repair or schedule a manual nodesync on the node. See:

For instructions on enabling the DSE Backup and Restore Service, see Enabling and configuring the DSE Backup and Restore Service .

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