creating-data-lake-table

Imported from aws/agent-toolkit-for-aws (plugins/aws-data-analytics/skills/creating-data-lake-table/SKILL.md) via skills.sh. Install upstream with npx skills add aws/agent-toolkit-for-aws --skill creating-data-lake-table. Copyright stays with the author.

Create Data Lake Tables with Amazon S3 Tables

Overview

Amazon S3 Tables provides managed Iceberg tables with automatic compaction and snapshot management. Queryable via Athena and Iceberg-compatible engines.

Common Tasks

You MUST use AWS MCP server tools when connected, they provide command validation, sandboxed execution, and audit logging. Fall back to AWS CLI if MCP unavailable.

Decision Guide

Before creating, You MUST check what exists:

You MUST run aws glue get-tables --database-name <NAME> when user mentions a database.

Creation paths:

• Existing data in S3: Create empty table (Steps 1-8), then use ingesting-into-data-lake skill.
• Glue ETL pipeline: Read references/table-creation-glue-etl.md first, then Steps 1-6.
• Lake Formation access control: Search AWS docs for "S3 Tables integration with Lake Formation".

1. Verify Dependencies

Constraints:

• You MUST check whether AWS MCP server tools or AWS CLI are available and inform user if missing
• You MUST confirm target AWS region and verify credentials with aws sts get-caller-identity

2. Understand the Schema

• Explicit schema: Validate Iceberg types.
• Loose description: Ask columns, types, grain. Propose and confirm.
• Existing S3 data: Infer schema from file headers only. Create empty table first, then use ingesting-into-data-lake skill.

Constraints:

• You MUST read references/best-practices.md for Iceberg type mapping, partitions, and naming.
• You MUST ask for all required parameters upfront: table name, columns, types, partition strategy. For schema evolution, see references/athena-ddl-path.md.
• You MUST use all lowercase names -- Glue rejects mixed case with GENERIC_INTERNAL_ERROR. Namespace and table names MUST NOT contain hyphens.
• You SHOULD suggest partition columns based on access patterns.

3. Create Table Bucket

Names: 3-63 chars, lowercase, numbers, hyphens.

aws s3tables create-table-bucket --name <BUCKET_NAME> --region <REGION>

Capture table-bucket-arn. Encryption (SSE-S3 default, SSE-KMS) and storage class (STANDARD, INTELLIGENT_TIERING) set at creation. See references/best-practices.md.

Constraints:

• You MUST check existing buckets with aws s3tables list-table-buckets and ask user to select or create new.
• If using SSE-KMS, KMS key policy MUST allow S3 Tables maintenance service principal to read data. Search AWS docs for "S3 Tables KMS key policy" for required policy.
• If bucket creation fails, see references/best-practices.md for common errors.

4. Create Namespace

aws s3tables create-namespace --table-bucket-arn <ARN> --namespace <NAMESPACE>

Constraints:

• You MUST list existing namespaces first and suggest reusing if relevant
• You MUST use lowercase names with no hyphens

5. Create Glue Data Catalog Integration

Check if s3tablescatalog exists (create once per region per account):

aws glue get-catalog --catalog-id s3tablescatalog

If not found, create (requires glue:CreateCatalog, glue:passConnection):

aws glue create-catalog --name "s3tablescatalog" --catalog-input '{
  "FederatedCatalog": {
    "Identifier": "arn:aws:s3tables:<REGION>:<ACCOUNT_ID>:bucket/*",
    "ConnectionName": "aws:s3tables"
  },
  "CreateDatabaseDefaultPermissions": [{"Principal": {"DataLakePrincipalIdentifier": "IAM_ALLOWED_PRINCIPALS"}, "Permissions": ["ALL"]}],
  "CreateTableDefaultPermissions": [{"Principal": {"DataLakePrincipalIdentifier": "IAM_ALLOWED_PRINCIPALS"}, "Permissions": ["ALL"]}],
  "AllowFullTableExternalDataAccess": "True"
}'

Verify with aws glue get-catalogs --parent-catalog-id s3tablescatalog.

6. Configure Access Control

S3 Tables uses s3tables:* IAM namespace (not s3:*).

Querying principal permissions (bucket policy):

• s3tables:GetTableBucket, s3tables:GetNamespace, s3tables:GetTable, s3tables:GetTableMetadataLocation, s3tables:GetTableData

Querying principal permissions (IAM policy):

• glue:GetCatalog, glue:GetDatabase, glue:GetTable

You MUST scope to correct ARN patterns. You MUST read references/access-control.md for exact resource ARNs.

Constraints:

• You MUST ask user for querying principal ARN
• You MUST NOT grant broader permissions than necessary
• You MUST NOT create IAM roles automatically, verify existing and guide user

7. Create the Table

Default: S3 Tables API:

aws s3tables create-table \
  --table-bucket-arn <ARN> \
  --namespace <NAMESPACE> \
  --name <TABLE_NAME> \
  --format ICEBERG \
  --metadata '<METADATA_JSON>'

Metadata JSON MUST nest under "iceberg" key:

{"iceberg":{"schema":{"fields":[
  {"name":"order_date","type":"date","required":true},
  {"name":"customer_id","type":"string","required":true},
  {"name":"amount","type":"double","required":false}
]},
"partitionSpec":{"fields":[
  {"sourceId":1,"fieldId":1000,"transform":"month","name":"order_date_month"}
]}}}

Constraints:

• partitionSpec.sourceId MUST reference a valid schema field ID
• For schema evolution after creation, use Athena DDL. See references/athena-ddl-path.md
• You MUST use schemaV2 for complex types (list, map, struct) with explicit field IDs. See references/best-practices.md.
• You SHOULD search AWS docs for "IcebergPartitionField S3 Tables" for supported partition transforms

8. Verify and Confirm

You MUST verify with aws s3tables get-table and confirm queryability with DESCRIBE <table_name> via Athena using --query-execution-context '{"Catalog":"s3tablescatalog/<BUCKET_NAME>","Database":"<NAMESPACE>"}'. Do NOT put catalog in SQL. Present summary: bucket ARN, namespace, table, schema, partitions.

Troubleshooting

Additional Resources

• access-control.md -- IAM permissions, ARN patterns, permission errors
• best-practices.md -- Iceberg types, partitions, naming, common errors
• athena-ddl-path.md -- Athena DDL, schema evolution
• table-creation-glue-etl.md -- Spark DDL via Glue ETL
• Loading data: ingesting-into-data-lake skill