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Provisioning Cluster Resources

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      Provisioning cluster resources is managed at the collection or bucket level, depending upon the service affected. Common use cases are outlined here, less common use cases are covered in the API docs.

      The primary means for managing clusters is through the Couchbase Web UI which provides an easy to use interface for adding, removing, monitoring and modifying buckets. In some instances you may wish to have a programmatic interface. For example, if you wish to manage a cluster from a setup script, or if you are setting up buckets in test scaffolding.

      The Rust SDK also comes with some convenience functionality for common Couchbase management requests.

      Bucket Management

      The BucketManager interface may be used to create and delete buckets from the Couchbase cluster.

      BucketSettings is used for creating and updating buckets. BucketSettings is also used for exposing information about existing buckets.

      Note that any property that is not explicitly set when building the bucket settings will use the default value. In the case of the update, this is not necessarily the currently configured value, so you should be careful to set all properties to their correct expected values when updating an existing bucket configuration.

      Here is the list of parameters available for BucketSettings. The "Updatable" column indicates whether the parameter may only be specified when creating a bucket, or whether it may be updated after creation.

      Name Type Description Updatable

      name

      String

      The name of the bucket, required for creation.

      false

      ram_quota_mb

      u64

      How much memory should each node use for the bucket, required for creation.

      true

      flush_enabled

      bool

      Enables flushing to be performed on this bucket (see the Flushing Buckets section below).

      true

      num_replicas

      u32

      The number of replicas to use for the bucket.

      true

      evictionPolicy

      EvictionPolicyType

      The type of the eviction to use for the bucket, defaults to ValueOnly.

      true (note: changing will cause the bucket to restart causing temporary inaccessibility)

      max_expiry

      Duration

      The default maximum time-to-live to apply to documents in the bucket. (note: This option is only available for Couchbase and Ephemeral buckets in Couchbase Enterprise Edition.)

      true

      compressionMode

      CompressionMode

      The compression mode to apply to documents in the bucket. (note: This option is only available for Couchbase and Ephemeral buckets in Couchbase Enterprise Edition.)

      true

      minimum_durability_level

      DurabilityLevel

      The durability level to be assigned to the bucket.

      true

      conflictResolutionType

      ConflictResolutionType

      The conflict resolution type to apply to conflicts on the bucket, defaults to SequenceNumber

      false

      replica_indexes

      bool

      Whether or not to replicate indexes.

      false

      bucket_type

      BucketType

      The type of the bucket, required for creation.

      false

      storage_backend

      StorageBackend

      The storage backend to be assigned to and used by the bucket.

      true (note: additional steps required to migrate a bucket’s storage backend. See Migrate a Bucket’s Storage Backend for more information)

      num_vbuckets

      u16

      The number of vBuckets for this bucket.

      false

      history_retention_collection_default

      bool

      Whether a change history is made for the bucket. This parameter is ignored unless the storageBackend is set to magma.

      true

      history_retention_collection_fault

      bool

      Whether a change history is made for the bucket. This parameter is ignored unless the storageBackend is set to magma.

      true

      history_retention_bytes

      u64

      Specifies the maximum size, in bytes, of the change history that is written to disk for all collections in this bucket when the value of history_retention_collection_fault is true.

      true

      history_retention_duration

      Duration

      Specifies the maximum number of seconds to be covered by the change history that is written to disk for all collections in this bucket when the value of history_retention_collection_fault is true.

      true

      The following example creates a "hello" bucket:

      let bucket_manager = cluster.buckets();

let bucket = BucketSettings::new("hello")
    .flush_enabled(false)
    .replica_indexes(false)
    .num_replicas(1)
    .bucket_type(BucketType::COUCHBASE)
    .conflict_resolution_type(ConflictResolutionType::SEQUENCE_NUMBER);

match bucket_manager.create_bucket(bucket, None).await {
    Ok(_) => println!("Bucket created successfully"),
    Err(e) => println!("Error: {e}"),
}

      We can now get this bucket and update it to enable Flush:

      match bucket_manager.get_bucket("hello", None).await {
    Ok(bucket) => {
        let bucket = bucket.flush_enabled(true);
        match bucket_manager.update_bucket(bucket, None).await {
            Ok(_) => println!("Bucket updated successfully"),
            Err(e) => println!("Error: {e}"),
        }
    }
    Err(e) => println!("Error: {e}"),
}
match bucket_manager.flush_bucket("hello", None).await {
    Ok(_) => println!("Bucket flushed successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::BucketNotFlushable => {
            println!("Flushing is not enabled on this bucket")
        }
        _ => {
            println!("Error: {e}")
        }
    },
}

      Once you no longer need to use the bucket, you can remove it:

      match bucket_manager.drop_bucket("hello", None).await {
    Ok(_) => println!("Bucket dropped successfully"),
    Err(e) => println!("Error: {e}"),
}

      Flushing Buckets

      When a bucket is flushed, all content is removed. Because this operation is potentially dangerous it is disabled by default for each bucket. Bucket flushing may be useful in test environments where it becomes a simpler alternative to removing and creating a test bucket. You may enable bucket flushing on a per-bucket basis using the Couchbase Web Console or when creating a bucket.

      You can flush a bucket in the SDK by using the Flush method:

      match bucket_manager.get_bucket("hello", None).await {
    Ok(bucket) => {
        let bucket = bucket.flush_enabled(true);
        match bucket_manager.update_bucket(bucket, None).await {
            Ok(_) => println!("Bucket updated successfully"),
            Err(e) => println!("Error: {e}"),
        }
    }
    Err(e) => println!("Error: {e}"),
}
match bucket_manager.flush_bucket("hello", None).await {
    Ok(_) => println!("Bucket flushed successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::BucketNotFlushable => {
            println!("Flushing is not enabled on this bucket")
        }
        _ => {
            println!("Error: {e}")
        }
    },
}

      Collection Management

      The CollectionManager interface may be used to create and delete scopes and collections from the Couchbase cluster. It is instantiated through the Bucket.collections() method.

      let collection_manager = bucket.collections();

      You can create a scope:

      match collection_manager.create_scope("my_scope", None).await {
    Ok(_) => println!("Scope created successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::ScopeExists => {
            println!("Scope already exists");
        }
        _ => {
            println!("Error: {e}");
        }
    },
}

      You can then create a collection within that scope:

      let settings = CreateCollectionSettings::new()
    .max_expiry(MaxExpiryValue::InheritFromBucket)
    .history(false);

match collection_manager
    .create_collection("example-scope", "example_collection", settings, None)
    .await
{
    Ok(_) => println!("Collection created successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::ScopeNotFound => {
            println!("Scope does not exist");
        }
        couchbase::error::ErrorKind::CollectionExists => {
            println!("Collection already exists");
        }
        _ => {
            println!("Error: {e}");
        }
    },
}

      Finally, you can drop unneeded collections and scopes:

      match collection_manager
    .drop_collection("example-scope", "example-collection", None)
    .await
{
    Ok(_) => println!("Collection dropped successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::ScopeNotFound => {
            println!("Scope not found");
        }
        couchbase::error::ErrorKind::CollectionNotFound => {
            println!("Collection not found");
        }
        _ => {
            println!("Error: {e}");
        }
    },
}

[data-source-url=https://github.com/couchbase/docs-sdk-rust/blob/61f0c078f4f55672d0c5bac012752964ace26ef9/modules/devguide/examples/src/cluster_resources.rs#L129-L139]
match collection_manager.drop_scope("example-scope", None).await {
    Ok(_) => println!("Scope dropped successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::ScopeNotFound => {
            println!("Scope not found");
        }
        _ => {
            println!("Error: {e}");
        }
    },
}

      Note that the most minimal permissions to create and drop a Scope or Collection is Manage Scopes along with Data Reader.

      You can create users with the appropriate RBAC programmatically:

      let user_manager = cluster.users();
let user = User::new(
    "scope-admin",
    "display-name",
    vec![
        Role::new("scope_admin").bucket("travel-sample"),
        Role::new("data_reader").bucket("travel-sample"),
    ],
);
match user_manager
    .upsert_user(user.password("password"), None)
    .await
{
    Ok(_) => println!("User created successfully"),
    Err(e) => println!("Error: {e}"),
}

      Index Management

      In general, you will rarely need to work with Index Managers from the SDK.

      For those occasions when you do, you will find some of these described in the following section.

      QueryIndexManager

      The QueryIndexManager interface contains the means for managing indexes used for queries.
      It can be accessed via Collection.query_indexes().

      let collection = cluster
    .bucket("travel-sample")
    .scope("tenant_agent_01")
    .collection("users");
let query_index_manager = collection.query_indexes();

      Applications can use this manager to perform operations such as creating, deleting, and fetching primary or secondary indexes:

      • A Primary index is built from a document’s key and is mostly suited for simple queries.

      • A Secondary index is the most commonly used type, and is suited for complex queries that require filtering on document fields.

      To perform query index operations, the provided user must either be an Admin or assigned the Query Manage Index role. See the Roles page for more information.

      The example below shows how to create a simple primary index on the collection, by calling the create_primary_index() method.

      Creating a primary index
      match query_index_manager
    .create_primary_index(
        CreatePrimaryQueryIndexOptions::new()
            .index_name("custom_name")
            .ignore_if_exists(true),
    )
    .await
{
    Ok(_) => println!("Primary index created successfully"),
    Err(e) => println!("Error: {e}"),
}

      When a primary index name is not specified, the SDK will create the index as #primary by default. However, if you wish to provide a custom name, you can simply pass an indexName argument to CreatePrimaryIndexOptions.

      You may have noticed that the example also sets the ignoreIfExists boolean flag. When set to true, this optional argument ensures that an error is not thrown if an index under the same name already exists.

      Creating a secondary index follows a similar approach, with some minor differences:

      Creating a secondary index
      match query_index_manager
    .create_index("tenant_agent_01_users_email", vec!["preferred_email".to_string()], None)
    .await
{
    Ok(_) => println!("Secondary index created successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::IndexExists => {
            println!("Index already exists");
        }
        _ => {
            println!("Error: {e}");
        }
    },
}

      The create_index() method requires an index name to be provided, along with the fields to create the index on.

      Indexes can easily take a long time to build if they contain a lot of documents. In these situations, it is more ideal to build indexes in the background. To achieve this we can use the deferred boolean option, and set it to true.

      Deferring index creation
      match query_index_manager
    .create_index(
        "tenant_agent_01_users_email",
        vec!["preferred_email".to_string()],
        CreateQueryIndexOptions::new().deferred(true),
    )
    .await
{
    Ok(_) => println!("Secondary index created successfully"),
    Err(e) => match e.kind() {
        couchbase::error::ErrorKind::IndexExists => {
            println!("Index already exists");
        }
        _ => {
            println!("Error: {e}");
        }
    },
}

match query_index_manager.build_deferred_indexes(None).await {
    Ok(_) => println!("Deferred indexes are being built"),
    Err(e) => println!("Error: {e}"),
}

match query_index_manager
    .watch_indexes(vec!["tenant_agent_01_users_phone".to_string()], None)
    .await
{
    Ok(_) => println!("All watched indexes are online"),
    Err(e) => println!("Error: {e}"),
}

      To delete a query index you can use the drop_index() or drop_primary_index() methods. Which one you use depends on the type of query index you wish to drop from the cluster.

      Deleting an index
      match query_index_manager.drop_primary_index(None).await {
    Ok(_) => println!("Primary index dropped successfully"),
    Err(e) => println!("Error: {e}"),
}

match query_index_manager
    .drop_index("tenant_agent_01_users_email", None)
    .await
{
    Ok(_) => println!("Secondary index dropped successfully"),
    Err(e) => println!("Error: {e}"),
}