AWS S3 Bucket

stores

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   "stores" : [
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     {
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       "name" : "<string>",
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       "provider" : "<string>",
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       "region" : "<string>",
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       "bucket" : "<string>",
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       "additionalStorageClasses" : ["<string>"],
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       "prefix" : "<string>",
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       "delimiter" : "<string>",
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       "includeTags": <boolean>,
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       "public": <boolean>
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     }
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   ]

stores

Array of objects where each object represents a data store to associate with the federated database instance. The federated database instance store captures files in an S3 bucket, documents in Atlas cluster, or files stored at publicly accessible URLs. Atlas Data Federation can only access data stores defined in the stores object.

stores.[n].name

Name of the federated database instance store. The databases.[n].collections.[n].dataSources.[n].storeName field references this value as part of mapping configuration.

stores.[n].provider

Defines where the data is stored. Value must be s3 for an AWS S3 bucket.

stores.[n].region

Name of the AWS region in which the S3 bucket is hosted. For a list of valid region names, see Amazon Web Services (AWS).

stores.[n].bucket

Name of the AWS S3 bucket. Must exactly match the name of an S3 bucket which Atlas Data Federation can access with the configured AWS IAM credentials.

stores.[n].additionalStorageClasses

Optional. Array of AWS S3 storage classes. Atlas Data Federation will include the files in these storage classes in the query results. Valid values are:

• INTELLIGENT_TIERING to include files in the Intelligent Tiering storage class

• STANDARD_IA to include files in the Standard-Infrequent Access storage class

  Note

  Files in the Standard storage class are supported by default.

stores.[n].prefix

Optional. Prefix Atlas Data Federation applies when searching for files in the S3 bucket.

For example, consider an S3 bucket metrics with the following structure:

metrics
  |--hardware
  |--software
    |--computed

The federated database instance store prepends the value of prefix to the databases.[n].collections.[n].dataSources.[n].path to create the full path for files to ingest. Setting the prefix to /software restricts any databases objects using the federated database instance store to only subpaths /software.

If omitted, Atlas Data Federation searches all files from the root of the S3 bucket.

stores.[n].delimiter

Optional. The delimiter that separates databases.[n].collections.[n].dataSources.[n].path segments in the federated database instance store. Data Federation uses the delimiter to efficiently traverse S3 buckets with a hierarchical directory structure. You can specify any character supported by the S3 object keys as the delimiter. For example, you can specify an underscore (_) or a plus sign (+) or multiple characters such as double underscores (__) as the delimiter.

If omitted, defaults to "/".

stores.[n].includeTags

Optional. Determines whether or not to use S3 tags on the files in the given path as additional partition attributes. Valid values are true and false.

If omitted, defaults to false.

If set to true, Atlas Data Federation does the following:

• Adds the S3 tags as additional partition attributes.

• Adds new top level BSON elements that associate each tag to each document for the tagged files.

Warning

If set to true, Atlas Data Federation processes the files for additional partition attributes by making extra calls to S3 to get the tags. This behavior might impact performance.

stores.[n].public

Optional. Specifies whether the bucket is public.

If set to true, Atlas Data Federation doesn't use the configured AWS IAM role to access the S3 bucket. If set to false, the configured AWS IAM must include permissions to access the S3 bucket, even if that bucket is public.

If omitted, defaults to false.

databases

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"databases" : [
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  {
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    "name" : "<string>",
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    "collections" : [
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      {
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        "name" : "<string>",
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        "dataSources" : [
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          {
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            "storeName" : "<string>",
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            "defaultFormat" : "<string>",
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            "path" : "<string>",
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            "provenanceFieldName": "<string>",
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            "omitAttributes": <boolean>
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          }
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        ]
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      }
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    ], 
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    "maxWildcardCollections" : <integer>,
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    "views" : [
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      {
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        "name" : "<string>",
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        "source" : "<string>",
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        "pipeline" : "<string>"
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      }
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    ]
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  }
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]

databases

Array of objects where each object represents a database, its collections, and, optionally, any views on the collections. Each database can have multiple collections and views objects.

databases.[n].name

Name of the database to which Atlas Data Federation maps the data contained in the data store.

databases.[n].collections

Array of objects where each object represents a collection and data sources that map to a stores federated database instance store.

databases.[n].collections.[n].name

Name of the collection to which Atlas Data Federation maps the data contained in each databases.[n].collections.[n].dataSources.[n].storeName. Each object in the array represents the mapping between the collection and an object in the stores array.

You can generate collection names dynamically from file paths by specifying * for the collection name and the collectionName() function in the path field. See Generate Dynamic Collection Names from File Path for examples.

databases.[n].collections.[n].dataSources

Array of objects where each object represents a stores federated database instance store to map with the collection.

databases.[n].collections.[n].dataSources.[n].storeName

Name of a federated database instance store to map to the <collection>. Must match the name of an object in the stores array.

databases.[n].collections.[n].dataSources.[n].path

Controls how Atlas Data Federation searches for and parses files in the storeName before mapping them to the <collection>. federated database instance prepends the stores.[n].prefix to the path to build the full path to search within. Specify / to capture all files and folders from the prefix path.

For example, consider an S3 bucket metrics with the following structure:

metrics
|--hardware
|--software
  |--computed

A path of / directs Atlas Data Federation to search all files and folders in the metrics bucket.

A path of /hardware directs Atlas Data Federation to search only that path for files to ingest.

If the prefix is software, Atlas Data Federation searches for files only in the path /software/computed.

Appending the * wildcard character to the path directs Atlas Data Federation to include all files and folders from that point in the path. For example, /software/computed* would match files like /software/computed-detailed, /software/computedArchive, and /software/computed/errors.

path supports additional syntax for parsing filenames, including:

• Generating document fields from filenames.

• Using regular expressions to control field generation.

• Setting boundaries for bucketing filenames by timestamp.

See Define Path for S3 Data for more information.

When specifying the path:

• Specify the data type for the partition attribute.

• Ensure that the partition attribute type matches the data type to parse.

• Use the delimiter specified in delimiter.

When specifying attributes of the same type, do any of the following:

• Add a constant separator between the attributes.

• Use regular expressions to describe the search pattern. To learn more, see Unsupported Parsing Functions.

databases.[n].collections.[n].dataSources.[n].defaultFormat

Optional. Default format that Data Federation assumes if it encounters a file without an extension while searching the databases.[n].collections.[n].dataSources.[n].storeName.

The following values are valid for the defaultFormat field:

.json, .json.gz, .bson, .bson.gz, .avro, .avro.gz, .orc, .tsv, .tsv.gz, .csv, .csv.gz, .parquet

Note

If your file format is CSV or TSV, you must include a header row in your data. See CSV and TSV for more information.

If omitted, Data Federation attempts to detect the file type by processing a few bytes of the file.

Tip

See also:

Supported Data Formats

databases.[n].collections.[n].dataSources.[n].provenanceFieldName

Name for the field that includes the provenance of the documents in the results. If you specify this setting in the storage configuration, Atlas Data Federation returns the following fields for each document in the result:

Field Name	Description
provider	Provider (stores.[n].provider) in the federated database instance storage configuration
region	AWS region (stores.[n].region)
bucket	Name of the AWS S3 bucket (stores.[n].bucket)
key	Path (databases.[n].collections.[n].dataSources.[n].path) to the document
lastModified	Date and time the document was last modified.

You can't configure this setting using the Visual Editor in the Atlas UI.

databases.[n].collections.[n].dataSources.[n].omitAttributes

Optional. Flag that specifies whether to omit the attributes (key and value pairs) that Atlas Data Federation adds to documents in the collection. You can specify one of the following values:

• false - to add the attributes

• true - to omit the attributes

If omitted, defaults to false and Atlas Data Federation adds the attributes.

Example

Consider a file named /employees/949-555-0195.json for which you configure the path /employees/{phone string}. Atlas Data Federation adds the attribute phone: 949-555-0195 to documents in this file if omitAttributes is false, regardless of whether the key-value pair already exists in the document. If you set omitAttributes to true, Atlas Data Federation doesn't add the attribute to the document in the virtual collection.

databases.[n].maxWildcardCollections

Optional. Maximum number of wildcard * collections in the database. Each wildcard collection can have only one data source. Value can be between 1 and 1000, inclusive. If omitted, defaults to 100.

databases.[n].views

Array of objects where each object represents an aggregation pipeline on a collection. To learn more about views, see Views.

databases.[n].views.[n].name

Name of the view.

databases.[n].views.[n].source

Name of the source collection for the view. If you want to create a view with a $sql stage, you must omit this field as the SQL statement will specify the source collection.

databases.[n].views.[n].pipeline

Aggregation pipeline stage(s) to apply to the source collection. You can also create views using the $sql stage.