AWS Lake Formation helps with enterprise data governance and is important for a data mesh architecture. It works with the AWS Glue Data Catalog to enforce data access and governance. Both services provide reliable data storage, but some customers want replicated storage, catalog, and permissions for compliance purposes.
This post explains how to create a design that automatically backs up Amazon Simple Storage Service (Amazon S3), the AWS Glue Data Catalog, and Lake Formation permissions in different Regions and provides backup and restore options for disaster recovery. These mechanisms can be customized for your organization’s processes. The utility for cloning and experimentation is available in the open-sourced GitHub repository.
This solution only replicates metadata in the Data Catalog, not the actual underlying data. To have a redundant data lake using Lake Formation and AWS Glue in an additional Region, we recommend replicating the Amazon S3-based storage using S3 replication, S3 sync, aws-s3-copy-sync-using-batch or S3 Batch replication process. This ensures that the data lake will still be functional in another Region if Lake Formation has an availability issue. The Data Catalog setup (tables, databases, resource links) and Lake Formation setup (permissions, settings) must also be replicated in the backup Region.
This post shows how to create a backup of the Lake Formation permissions and AWS Glue Data Catalog from one Region to another in the same account. The solution doesn’t create or modify AWS Identity and Access Management (IAM) roles, which are available in all Regions. There are three steps to creating a multi-Region data lake:
- Migrate Lake Formation data permissions.
- Migrate AWS Glue databases and tables.
- Migrate Amazon S3 data.
In the following sections, we look at each migration step in more detail.
Lake Formation permissions
In Lake Formation, there are two types of permissions: metadata access and data access.
Metadata access permissions allow users to create, read, update, and delete metadata databases and tables in the Data Catalog.
Data access permissions allow users to read and write data to specific locations in Amazon S3. Data access permissions are managed using data location permissions, which allow users to create and alter metadata databases and tables that point to specific Amazon S3 locations.
When data is migrated from one Region to another, only the metadata access permissions are replicated. This means that if data is moved from a bucket in the source Region to another bucket in the target Region, the data access permissions need to be reapplied in the target Region.
AWS Glue Data Catalog
The AWS Glue Data Catalog is a central repository of metadata about data stored in your data lake. It contains references to data that is used as sources and targets in AWS Glue ETL (extract, transform, and load) jobs, and stores information about the location, schema, and runtime metrics of your data. The Data Catalog organizes this information in the form of metadata tables and databases. A table in the Data Catalog is a metadata definition that represents the data in a data lake, and databases are used to organize these metadata tables.
Lake Formation permissions can only be applied to objects that already exist in the Data Catalog in the target Region. Therefore, in order to apply these permissions, the underlying Data Catalog databases and tables must already exist in the target Region. To meet this requirement, this utility migrates both the AWS Glue databases and tables from the source Region to the target Region.
Amazon S3 data
The data that underlies an AWS Glue table can be stored in an S3 bucket in any Region, so replication of the data itself isn’t necessary. However, if the data has already been replicated to the target Region, this utility has the option to update the table’s location to point to the replicated data in the target Region. If the location of the data is changed, the utility updates the S3 bucket name and keeps the rest of the prefix hierarchy unchanged.
This utility doesn’t include the migration of data from the source Region to the target Region. Data migration must be performed separately using methods such as S3 replication, S3 sync, aws-s3-copy-sync-using-batch or S3 Batch replication.
This utility has two modes for replicating Lake Formation and Data Catalog metadata: on-demand and real-time. The on-demand mode is a batch replication that takes a snapshot of the metadata at a specific point in time and uses it to synchronize the metadata. The real-time mode replicates changes made to the Lake Formation permissions or Data Catalog in near-real time.
The on-demand mode of this utility is recommended for creating existing Lake Formation permissions and Data Catalogs because it replicates a snapshot of the metadata. After the Lake Formation and Data Catalogs are synchronized, you can use real-time mode to replicate any ongoing changes. This creates a mirror image of the source Region in the target Region and keeps it up to date as changes are made in the source Region. These two modes can be used independently of each other, and the operations are idempotent.
The code for the on-demand and real-time modes is available in the GitHub repository. Let’s look at each mode in more detail.
On-demand mode is used to copy the Lake Formation permissions and Data Catalog at a specific point in time. The code is deployed using the AWS Cloud Development Kit (AWS CDK). The following diagram shows the solution architecture for this mode.
The AWS CDK deploys an AWS Glue job to perform the replication. The job retrieves configuration information from a file stored in an S3 bucket. This file includes details such as the source and target Regions, an optional list of databases to replicate, and options for moving data to a different S3 bucket. More information about these options and deployment instructions is available in the GitHub repository.
The AWS Glue job retrieves the Lake Formation permissions and Data Catalog object metadata from the source Region and stores it in a JSON file in an S3 bucket. The same job then uses this file to create the Lake Formation permissions and Data Catalog databases and tables in the target Region.
This tool can be run on demand by running the AWS Glue job. It copies the Lake Formation permissions and Data Catalog object metadata from the source Region to the target Region. If you run the tool again after making changes to the target Region, the changes are replaced with the latest Lake Formation permissions and Data Catalog from the source Region.
This utility can detect any changes made to the Data Catalog metadata, databases, tables, and columns while replicating the Data Catalog from the source to the target Region. If a change is detected in the source Region, the latest version of the AWS Glue object is applied to the target Region. The utility reports the number of objects modified during its run.
The Lake Formation permissions are copied from the source to the target Region, so any new permissions are replicated in the target Region. If a permission is removed from the source Region, it is not removed from the target Region.
Real-time mode replicates the Lake Formation permissions and Data Catalog at a regular interval. The default interval is 1 minute, but it can be modified during deployment. The code is deployed using the AWS CDK. The following diagram shows the solution architecture for this mode.
The AWS CDK deploys two AWS Lambda jobs and creates an Amazon DynamoDB table to store AWS CloudTrail events and an Amazon EventBridge rule to run the replication at a regular interval. The Lambda jobs retrieve the configuration information from a file stored in an S3 bucket. This file includes details such as the source and target Regions, options for moving data to a different S3 bucket, and the lookback period for CloudTrail in hours. More information about these options and deployment instructions is available in the GitHub repository.
The EventBridge rule triggers a Lambda job at a fixed interval. This job retrieves the configuration information and queries CloudTrail events related to the Data Catalog and Lake Formation that occurred in the past hour (the duration is configurable). All relevant events are then stored in a DynamoDB table.
After the event information is inserted into the DynamoDB table, another Lambda job is triggered. This job retrieves the configuration information and queries the DynamoDB table. It then applies all the changes to the target Region. If the tool is run again after making changes to the target Region, the changes are replaced with the latest Lake Formation permissions and Data Catalog from the source Region. Unlike on-demand mode, this utility also removes any Lake Formation permissions that were removed from the source Region from the target Region.
This utility is designed to replicate permissions within a single account only. The on-demand mode replicates a snapshot and doesn’t remove existing permissions, so it doesn’t perform delete operations. The API currently doesn’t support replicating changes to row and column permissions.
In this post, we showed how you can use this utility to migrate the AWS Glue Data Catalog and Lake Formation permissions from one Region to another. It can also keep the source and target Regions synchronized if any changes are made to the Data Catalog or the Lake Formation permissions. Implementing it across Regions (multi-Region) is a good option if you are looking for the most separation and complete independence of your globally diverse data workloads. Also consider the trade-offs. Implementing and operating this strategy, particularly using multi-Region, can be more complicated and more expensive, than other DR strategies.
To get started, checkout the github repo. For more resources, refer to the following:
About the authors
Vivek Shrivastava is a Principal Data Architect, Data Lake in AWS Professional Services. He is a Bigdata enthusiast and holds 13 AWS Certifications. He is passionate about helping customers build scalable and high-performance data analytics solutions in the cloud. In his spare time, he loves reading and finds areas for home automation
Raza Hafeez is a Senior Data Architect within the Shared Delivery Practice of AWS Professional Services. He has over 12 years of professional experience building and optimizing enterprise data warehouses and is passionate about enabling customers to realize the power of their data. He specializes in migrating enterprise data warehouses to AWS Modern Data Architecture.
Nivas Shankar is a Principal Product Manager for AWS Lake Formation. He works with customers around the globe to translate business and technical requirements into products that enable customers to improve how they manage, secure and access data lake. Also leads several data and analytics initiatives within AWS including support for Data Mesh.