dbt-glue 1.5.2

dbt (data build tool) adapter for Aws Glue

dbt enables data analysts and engineers to transform their data using the same practices that software engineers use to build applications. dbt is the T in ELT. Organize, cleanse, denormalize, filter, rename, and pre-aggregate the raw data in your warehouse so that it's ready for analysis.

dbt-glue

The dbt-glue package implements the dbt adapter protocol for AWS Glue's Spark engine. It supports running dbt against Spark, through the new Glue Interactive Sessions API.

To learn how to deploy a data pipeline in your modern data platform using the dbt-glue adapter, please read the following blog post: Build your data pipeline in your AWS modern data platform using AWS Lake Formation, AWS Glue, and dbt Core

Installation

The package can be installed from PyPI with:

$ pip3 install dbt-glue

For further (and more likely up-to-date) info, see the README

Connection Methods

Configuring your AWS profile for Glue Interactive Session

There are two IAM principals used with interactive sessions.

• Client principal: The princpal (either user or role) calling the AWS APIs (Glue, Lake Formation, Interactive Sessions) from the local client. This is the principal configured in the AWS CLI and likely the same.
• Service role: The IAM role that AWS Glue uses to execute your session. This is the same as AWS Glue ETL.

Read this documentation to configure these principals.

You will find bellow a least privileged policy to enjoy all features of dbt-glue adapter.

Please to update variables between <>, here are explanations of these arguments:

Args	Description
region	The region where your Glue database is stored
AWS Account	The AWS account where you run your pipeline
dbt output database	The database updated by dbt (this is the schema configured in the profile.yml of your dbt environment)
dbt source database	All databases used as source
dbt output bucket	The bucket name where the data will be generate dbt (the location configured in the profile.yml of your dbt environment)
dbt source bucket	The bucket name of source databases (if they are not managed by Lake Formation)

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Read_and_write_databases",
            "Action": [
                "glue:SearchTables",
                "glue:BatchCreatePartition",
                "glue:CreatePartitionIndex",
                "glue:DeleteDatabase",
                "glue:GetTableVersions",
                "glue:GetPartitions",
                "glue:DeleteTableVersion",
                "glue:UpdateTable",
                "glue:DeleteTable",
                "glue:DeletePartitionIndex",
                "glue:GetTableVersion",
                "glue:UpdateColumnStatisticsForTable",
                "glue:CreatePartition",
                "glue:UpdateDatabase",
                "glue:CreateTable",
                "glue:GetTables",
                "glue:GetDatabases",
                "glue:GetTable",
                "glue:GetDatabase",
                "glue:GetPartition",
                "glue:UpdateColumnStatisticsForPartition",
                "glue:CreateDatabase",
                "glue:BatchDeleteTableVersion",
                "glue:BatchDeleteTable",
                "glue:DeletePartition",
                "glue:GetUserDefinedFunctions",
                "lakeformation:ListResources",
                "lakeformation:BatchGrantPermissions",
                "lakeformation:ListPermissions"
            ],
            "Resource": [
                "arn:aws:glue:<region>:<AWS Account>:catalog",
                "arn:aws:glue:<region>:<AWS Account>:table/<dbt output database>/*",
                "arn:aws:glue:<region>:<AWS Account>:database/<dbt output database>"
            ],
            "Effect": "Allow"
        },
        {
            "Sid": "Read_only_databases",
            "Action": [
                "glue:SearchTables",
                "glue:GetTableVersions",
                "glue:GetPartitions",
                "glue:GetTableVersion",
                "glue:GetTables",
                "glue:GetDatabases",
                "glue:GetTable",
                "glue:GetDatabase",
                "glue:GetPartition",
                "lakeformation:ListResources",
                "lakeformation:ListPermissions"
            ],
            "Resource": [
                "arn:aws:glue:<region>:<AWS Account>:table/<dbt source database>/*",
                "arn:aws:glue:<region>:<AWS Account>:database/<dbt source database>",
                "arn:aws:glue:<region>:<AWS Account>:database/default",
                "arn:aws:glue:<region>:<AWS Account>:database/global_temp"
            ],
            "Effect": "Allow"
        },
        {
            "Sid": "Storage_all_buckets",
            "Action": [
                "s3:GetBucketLocation",
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::<dbt output bucket>",
                "arn:aws:s3:::<dbt source bucket>"
            ],
            "Effect": "Allow"
        },
        {
            "Sid": "Read_and_write_buckets",
            "Action": [
                "s3:PutObject",
                "s3:PutObjectAcl",
                "s3:GetObject",
                "s3:DeleteObject"
            ],
            "Resource": [
                "arn:aws:s3:::<dbt output bucket>"
            ],
            "Effect": "Allow"
        },
        {
            "Sid": "Read_only_buckets",
            "Action": [
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::<dbt source bucket>"
            ],
            "Effect": "Allow"
        }
    ]
}

Configuration of the local environment

Because dbt and dbt-glue adapter are compatible with Python versions 3.7, 3.8, and 3.9, check the version of Python:

$ python3 --version

Configure a Python virtual environment to isolate package version and code dependencies:

$ sudo yum install git
$ python3 -m venv dbt_venv
$ source dbt_venv/bin/activate
$ python3 -m pip install --upgrade pip

Configure the last version of AWS CLI

$ curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
$ unzip awscliv2.zip
$ sudo ./aws/install

Install boto3 package

$ sudo yum install gcc krb5-devel.x86_64 python3-devel.x86_64 -y
$ pip3 install —upgrade boto3

Install the package:

$ pip3 install dbt-glue

Example config

type: glue
query-comment: This is a glue dbt example
role_arn: arn:aws:iam::1234567890:role/GlueInteractiveSessionRole
region: us-east-1
workers: 2
worker_type: G.1X
idle_timeout: 10
schema: "dbt_demo"
session_provisioning_timeout_in_seconds: 120
location: "s3://dbt_demo_bucket/dbt_demo_data"

The table below describes all the options.

Option	Description	Mandatory
project_name	The dbt project name. This must be the same as the one configured in the dbt project.	yes
type	The driver to use.	yes
query-comment	A string to inject as a comment in each query that dbt runs.	no
role_arn	The ARN of the glue interactive session IAM role.	yes
region	The AWS Region were you run the data pipeline.	yes
workers	The number of workers of a defined workerType that are allocated when a job runs.	yes
worker_type	The type of predefined worker that is allocated when a job runs. Accepts a value of Standard, G.1X, or G.2X.	yes
schema	The schema used to organize data stored in Amazon S3.Additionally, is the database in AWS Lake Formation that stores metadata tables in the Data Catalog.	yes
session_provisioning_timeout_in_seconds	The timeout in seconds for AWS Glue interactive session provisioning.	yes
location	The Amazon S3 location of your target data.	yes
query_timeout_in_minutes	The timeout in minutes for a signle query. Default is 300	no
idle_timeout	The AWS Glue session idle timeout in minutes. (The session stops after being idle for the specified amount of time)	no
glue_version	The version of AWS Glue for this session to use. Currently, the only valid options are 2.0 and 3.0. The default value is 3.0.	no
security_configuration	The security configuration to use with this session.	no
connections	A comma-separated list of connections to use in the session.	no
conf	Specific configuration used at the startup of the Glue Interactive Session (arg --conf)	no
extra_py_files	Extra python Libs that can be used by the interactive session.	no
delta_athena_prefix	A prefix used to create Athena compatible tables for Delta tables (if not specified, then no Athena compatible table will be created)	no
tags	The map of key value pairs (tags) belonging to the session. Ex: KeyName1=Value1,KeyName2=Value2	no
seed_format	By default parquet, can be Spark format compatible like csv or json	no
seed_mode	By default overwrite, the seed data will be overwritten, you can set it to append if you just want to add new data in your dataset	no
default_arguments	The map of key value pairs parameters belonging to the session. More information on Job parameters used by AWS Glue. Ex: --enable-continuous-cloudwatch-log=true,--enable-continuous-log-filter=true	no

Configs

Configuring tables

When materializing a model as table, you may include several optional configs that are specific to the dbt-spark plugin, in addition to the standard model configs.

Option	Description	Required?	Example
file_format	The file format to use when creating tables (parquet, csv, json, text, jdbc or orc).	Optional	parquet
partition_by	Partition the created table by the specified columns. A directory is created for each partition.	Optional	date_day
clustered_by	Each partition in the created table will be split into a fixed number of buckets by the specified columns.	Optional	country_code
buckets	The number of buckets to create while clustering	Required if clustered_by is specified	8
custom_location	By default, the adapter will store your data in the following path: location path/schema/table. If you don't want to follow that default behaviour, you can use this parameter to set your own custom location on S3	No	s3://mycustombucket/mycustompath
hudi_options	When using file_format hudi, gives the ability to overwrite any of the default configuration options.	Optional	{'hoodie.schema.on.read.enable': 'true'}

Incremental models

dbt seeks to offer useful and intuitive modeling abstractions by means of its built-in configurations and materializations.

For that reason, the dbt-glue plugin leans heavily on the incremental_strategy config. This config tells the incremental materialization how to build models in runs beyond their first. It can be set to one of three values:

• append (default): Insert new records without updating or overwriting any existing data.
• insert_overwrite: If partition_by is specified, overwrite partitions in the table with new data. If no partition_by is specified, overwrite the entire table with new data.
• merge (Apache Hudi and Apache Iceberg only): Match records based on a unique_key; update old records, insert new ones. (If no unique_key is specified, all new data is inserted, similar to append.)

Each of these strategies has its pros and cons, which we'll discuss below. As with any model config, incremental_strategy may be specified in dbt_project.yml or within a model file's config() block.

Notes: The default strategy is insert_overwrite

The append strategy

Following the append strategy, dbt will perform an insert into statement with all new data. The appeal of this strategy is that it is straightforward and functional across all platforms, file types, connection methods, and Apache Spark versions. However, this strategy cannot update, overwrite, or delete existing data, so it is likely to insert duplicate records for many data sources.

Source code

{{ config(
    materialized='incremental',
    incremental_strategy='append',
) }}

--  All rows returned by this query will be appended to the existing table

select * from {{ ref('events') }}
{% if is_incremental() %}
  where event_ts > (select max(event_ts) from {{ this }})
{% endif %}

Run Code

create temporary view spark_incremental__dbt_tmp as

    select * from analytics.events

    where event_ts >= (select max(event_ts) from {{ this }})

;

insert into table analytics.spark_incremental
    select `date_day`, `users` from spark_incremental__dbt_tmp

The insert_overwrite strategy

This strategy is most effective when specified alongside a partition_by clause in your model config. dbt will run an atomic insert overwrite statement that dynamically replaces all partitions included in your query. Be sure to re-select all of the relevant data for a partition when using this incremental strategy.

If no partition_by is specified, then the insert_overwrite strategy will atomically replace all contents of the table, overriding all existing data with only the new records. The column schema of the table remains the same, however. This can be desirable in some limited circumstances, since it minimizes downtime while the table contents are overwritten. The operation is comparable to running truncate + insert on other databases. For atomic replacement of Delta-formatted tables, use the table materialization (which runs create or replace) instead.

Source Code

{{ config(
    materialized='incremental',
    partition_by=['date_day'],
    file_format='parquet'
) }}

/*
  Every partition returned by this query will be overwritten
  when this model runs
*/

with new_events as (

    select * from {{ ref('events') }}

    {% if is_incremental() %}
    where date_day >= date_add(current_date, -1)
    {% endif %}

)

select
    date_day,
    count(*) as users

from events
group by 1

Run Code

create temporary view spark_incremental__dbt_tmp as

    with new_events as (

        select * from analytics.events


        where date_day >= date_add(current_date, -1)


    )

    select
        date_day,
        count(*) as users

    from events
    group by 1

;

insert overwrite table analytics.spark_incremental
    partition (date_day)
    select `date_day`, `users` from spark_incremental__dbt_tmp

Specifying insert_overwrite as the incremental strategy is optional, since it's the default strategy used when none is specified.

The merge strategy

Compatibility:

• Hudi : OK
• Delta Lake : OK
• Iceberg : OK
• Lake Formation Governed Tables : On going

The simpliest way to work with theses advanced features is to install theses using Glue connectors.

When using a connector be sure that your IAM role has these policies:

{
    "Sid": "access_to_connections",
    "Action": [
        "glue:GetConnection",
        "glue:GetConnections"
    ],
    "Resource": [
        "arn:aws:glue:<region>:<AWS Account>:catalog",
        "arn:aws:glue:<region>:<AWS Account>:connection/*"
    ],
    "Effect": "Allow"
}

and that the managed policy AmazonEC2ContainerRegistryReadOnly is attached. Be sure that you follow the getting started instructions here.

This blog post also explain how to setup and works with Glue Connectors

Hudi

Usage notes: The merge with Hudi incremental strategy requires:

• To add file_format: hudi in your table configuration
• To add a connections in your profile : connections: name_of_your_hudi_connector
• To add Kryo serializer in your Interactive Session Config (in your profile): conf: "spark.serializer=org.apache.spark.serializer.KryoSerializer"

dbt will run an atomic merge statement which looks nearly identical to the default merge behavior on Snowflake and BigQuery. If a unique_key is specified (recommended), dbt will update old records with values from new records that match on the key column. If a unique_key is not specified, dbt will forgo match criteria and simply insert all new records (similar to append strategy).

Profile config example

test_project:
  target: dev
  outputs:
    dev:
      type: glue
      query-comment: my comment
      role_arn: arn:aws:iam::1234567890:role/GlueInteractiveSessionRole
      region: eu-west-1
      glue_version: "3.0"
      workers: 2
      worker_type: G.1X
      schema: "dbt_test_project"
      session_provisioning_timeout_in_seconds: 120
      location: "s3://aws-dbt-glue-datalake-1234567890-eu-west-1/"
      connections: name_of_your_hudi_connector
      conf: "spark.serializer=org.apache.spark.serializer.KryoSerializer"

Source Code example

{{ config(
    materialized='incremental',
    incremental_strategy='merge',
    unique_key='user_id',
    file_format='hudi',
    hudi_options={
        'hoodie.datasource.write.precombine.field': 'eventtime',
    }
) }}

with new_events as (

    select * from {{ ref('events') }}

    {% if is_incremental() %}
    where date_day >= date_add(current_date, -1)
    {% endif %}

)

select
    user_id,
    max(date_day) as last_seen

from events
group by 1

Delta

You can also use Delta Lake to be able to use merge feature on tables.

Usage notes: The merge with Delta incremental strategy requires:

• To add file_format: delta in your table configuration
• To add a connections in your profile : connections: name_of_your_delta_connector
• To add the following config in your Interactive Session Config (in your profile): conf: "spark.sql.extensions=io.delta.sql.DeltaSparkSessionExtension --conf spark.sql.catalog.spark_catalog=org.apache.spark.sql.delta.catalog.DeltaCatalog

Athena: Athena is not compatible by default with delta tables, but you can configure the adapter to create Athena tables on top of your delta table. To do so, you need to configure the two following options in your profile:

• extra_py_files: "/tmp/delta-core_2.12-1.0.0.jar"
• delta_athena_prefix: "the_prefix_of_your_choice"
• If your table is partitioned, then the add of new partition is not automatic, you need to perform an MSCK REPAIR TABLE your_delta_table after each new partition adding

Profile config example

test_project:
  target: dev
  outputs:
    dev:
      type: glue
      query-comment: my comment
      role_arn: arn:aws:iam::1234567890:role/GlueInteractiveSessionRole
      region: eu-west-1
      glue_version: "3.0"
      workers: 2
      worker_type: G.1X
      schema: "dbt_test_project"
      session_provisioning_timeout_in_seconds: 120
      location: "s3://aws-dbt-glue-datalake-1234567890-eu-west-1/"
      connections: name_of_your_delta_connector
      conf: "spark.sql.extensions=io.delta.sql.DeltaSparkSessionExtension --conf spark.sql.catalog.spark_catalog=org.apache.spark.sql.delta.catalog.DeltaCatalog"
      extra_py_files: "/tmp/delta-core_2.12-1.0.0.jar"
      delta_athena_prefix: "delta"

Source Code example

{{ config(
    materialized='incremental',
    incremental_strategy='merge',
    unique_key='user_id',
    partition_by=['dt'],
    file_format='delta'
) }}

with new_events as (

    select * from {{ ref('events') }}

    {% if is_incremental() %}
    where date_day >= date_add(current_date, -1)
    {% endif %}

)

select
    user_id,
    max(date_day) as last_seen,
    current_date() as dt

from events
group by 1

Iceberg

Usage notes: The merge with Iceberg incremental strategy requires:

• To attach the AmazonEC2ContainerRegistryReadOnly Manged policy to your execution role :
• To add the following policy to your execution role to enable commit locking in a dynamodb table (more info here). Note that the DynamoDB table specified in the ressource field of this policy should be the one that is mentionned in your dbt profiles (--conf spark.sql.catalog.glue_catalog.lock.table=myGlueLockTable). By default, this table is named myGlueLockTable and is created automatically (with On-Demand Pricing) when running a dbt-glue model with Incremental Materialization and Iceberg file format. If you want to name the table differently or to create your own table without letting Glue do it on your behalf, please provide the iceberg_glue_commit_lock_table parameter with your table name (eg. MyDynamoDbTable) in your dbt profile.

iceberg_glue_commit_lock_table: "MyDynamoDbTable"

• the latest connector for icerberg in AWS marketplace uses Ver 0.14.0 where Kryo serialization fails when writing iceberg, use "org.apache.spark.serializer.JavaSerializer" for spark.serializer instead, more info here

Make sure you update your conf with --conf spark.sql.catalog.glue_catalog.lock.table=<YourDynamoDBLockTableName> and, you change the below iam permission with your correct table name.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "CommitLockTable",
            "Effect": "Allow",
            "Action": [
                "dynamodb:CreateTable",
                "dynamodb:BatchGetItem",
                "dynamodb:BatchWriteItem",
                "dynamodb:ConditionCheckItem",
                "dynamodb:PutItem",
                "dynamodb:DescribeTable",
                "dynamodb:DeleteItem",
                "dynamodb:GetItem",
                "dynamodb:Scan",
                "dynamodb:Query",
                "dynamodb:UpdateItem"
            ],
            "Resource": "arn:aws:dynamodb:<AWS_REGION>:<AWS_ACCOUNT_ID>:table/myGlueLockTable"
        }
    ]
}

• To add file_format: Iceberg in your table configuration
• To add a connections in your profile : connections: name_of_your_iceberg_connector (
  • For Athena version 3:
    • The adapter is compatible with the Iceberg Connector from AWS Marketplace with Glue 3.0 as Fulfillment option and 0.14.0 (Oct 11, 2022) as Software version)
    • the latest connector for iceberg in AWS marketplace uses Ver 0.14.0 where Kryo serialization fails when writing iceberg, use "org.apache.spark.serializer.JavaSerializer" for spark.serializer instead, more info here
  • For Athena version 2: The adapter is compatible with the Iceberg Connector from AWS Marketplace with Glue 3.0 as Fulfillment option and 0.12.0-2 (Feb 14, 2022) as Software version)
• To add the following config in your Interactive Session Config (in your profile):

    --conf spark.serializer=org.apache.spark.serializer.KryoSerializer
    --conf spark.sql.warehouse=s3://<your-bucket-name>
    --conf spark.sql.catalog.glue_catalog=org.apache.iceberg.spark.SparkCatalog 
    --conf spark.sql.catalog.glue_catalog.catalog-impl=org.apache.iceberg.aws.glue.GlueCatalog 
    --conf spark.sql.catalog.glue_catalog.io-impl=org.apache.iceberg.aws.s3.S3FileIO 
    --conf spark.sql.catalog.glue_catalog.lock-impl=org.apache.iceberg.aws.glue.DynamoLockManager 
    --conf spark.sql.catalog.glue_catalog.lock.table=myGlueLockTable  
    --conf spark.sql.extensions=org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions

dbt will run an atomic merge statement which looks nearly identical to the default merge behavior on Snowflake and BigQuery. You need to provide a unique_key to perform merge operation otherwise it will fail. This key is to provide in a Python list format and can contains multiple column name to create a composite unique_key.

Notes

• When using a custom_location in Iceberg, avoid to use final trailing slash. Adding a final trailing slash lead to an un-proper handling of the location, and issues when reading the data from query engines like Trino. The issue should be fixed for Iceberg version > 0.13. Related Github issue can be find here.
• Iceberg also supports insert_overwrite and append strategies.
• The warehouse conf must be provided, but it's overwritten by the adapter location in your profile or custom_location in model configuration.
• By default, this materialization has iceberg_expire_snapshots set to 'True', if you need to have historical auditable changes, set: iceberg_expire_snapshots='False'.
• Currently, due to some dbt internal, the iceberg catalog used internally when running glue interactive sessions with dbt-glue has a hardcoded name glue_catalog. This name is an alias pointing to the AWS Glue Catalog but is specific to each session. If you want to interact with your data in another session without using dbt-glue (from a Glue Studio notebook, for example), you can configure another alias (ie. another name for the Iceberg Catalog). To illustrate this concept, you can set in your configuration file :

--conf spark.sql.catalog.RandomCatalogName=org.apache.iceberg.spark.SparkCatalog

And then run in an AWS Glue Studio Notebook a session with the following config:

--conf spark.sql.catalog.AnotherRandomCatalogName=org.apache.iceberg.spark.SparkCatalog

In both cases, the underlying catalog would be the AWS Glue Catalog, unique in your AWS Account and Region, and you would be able to work with the exact same data. Also make sure that if you change the name of the Glue Catalog Alias, you change it in all the other --conf where it's used:

 --conf spark.sql.catalog.RandomCatalogName=org.apache.iceberg.spark.SparkCatalog 
 --conf spark.sql.catalog.RandomCatalogName.catalog-impl=org.apache.iceberg.aws.glue.GlueCatalog 
 ...
 --conf spark.sql.catalog.RandomCatalogName.lock-impl=org.apache.iceberg.aws.glue.DynamoLockManager

• A full reference to table_properties can be found here.
• Iceberg Tables are natively supported by Athena. Therefore, you can query tables created and operated with dbt-glue adapter from Athena.
• Incremental Materialization with Iceberg file format supports dbt snapshot. You are able to run a dbt snapshot command that queries an Iceberg Table and create a dbt fashioned snapshot of it.

Profile config example

test_project:
  target: dev
  outputs:
    dev:
      type: glue
      query-comment: my comment
      role_arn: arn:aws:iam::1234567890:role/GlueInteractiveSessionRole
      region: eu-west-1
      glue_version: "3.0"
      workers: 2
      worker_type: G.1X
      schema: "dbt_test_project"
      session_provisioning_timeout_in_seconds: 120
      location: "s3://aws-dbt-glue-datalake-1234567890-eu-west-1/"
      connections: name_of_your_iceberg_connector
      conf: --conf spark.sql.extensions=org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions --conf spark.serializer=org.apache.spark.serializer.KryoSerializer --conf spark.sql.warehouse=s3://aws-dbt-glue-datalake-1234567890-eu-west-1/dbt_test_project --conf spark.sql.catalog.glue_catalog=org.apache.iceberg.spark.SparkCatalog --conf spark.sql.catalog.glue_catalog.catalog-impl=org.apache.iceberg.aws.glue.GlueCatalog --conf spark.sql.catalog.glue_catalog.io-impl=org.apache.iceberg.aws.s3.S3FileIO --conf spark.sql.catalog.glue_catalog.lock-impl=org.apache.iceberg.aws.glue.DynamoLockManager --conf spark.sql.catalog.glue_catalog.lock.table=myGlueLockTable  --conf spark.sql.extensions=org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions 

Source Code example

{{ config(
    materialized='incremental',
    incremental_strategy='merge',
    unique_key=['user_id'],
    file_format='iceberg',
    iceberg_expire_snapshots='False', 
    partition_by=['status']
    table_properties={'write.target-file-size-bytes': '268435456'}
) }}

with new_events as (

    select * from {{ ref('events') }}

    {% if is_incremental() %}
    where date_day >= date_add(current_date, -1)
    {% endif %}

)

select
    user_id,
    max(date_day) as last_seen

from events
group by 1

Iceberg Snapshot source code example

{% snapshot demosnapshot %}

{{
    config(
        strategy='timestamp',
        target_schema='jaffle_db',
        updated_at='dt',
        file_format='iceberg'
) }}

select * from {{ ref('customers') }}

{% endsnapshot %}

Monitoring your Glue Interactive Session

Monitoring is an important part of maintaining the reliability, availability, and performance of AWS Glue and your other AWS solutions. AWS provides monitoring tools that you can use to watch AWS Glue, identify the required number of workers required for your Glue Interactive Session, report when something is wrong and take action automatically when appropriate. AWS Glue provides Spark UI, and CloudWatch logs and metrics for monitoring your AWS Glue jobs. More information on: Monitoring AWS Glue Spark jobs

Usage notes: Monitoring requires:

• To add the following IAM policy to your IAM role:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "CloudwatchMetrics",
            "Effect": "Allow",
            "Action": "cloudwatch:PutMetricData",
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "cloudwatch:namespace": "Glue"
                }
            }
        },
        {
            "Sid": "CloudwatchLogs",
            "Effect": "Allow",
            "Action": [
                "s3:PutObject",
                "logs:CreateLogStream",
                "logs:CreateLogGroup",
                "logs:PutLogEvents"
            ],
            "Resource": [
                "arn:aws:logs:*:*:/aws-glue/*",
                "arn:aws:s3:::bucket-to-write-sparkui-logs/*"
            ]
        }
    ]
}

• To add monitoring parameters in your Interactive Session Config (in your profile). More information on Job parameters used by AWS Glue

Profile config example

test_project:
  target: dev
  outputs:
    dev:
      type: glue
      query-comment: my comment
      role_arn: arn:aws:iam::1234567890:role/GlueInteractiveSessionRole
      region: eu-west-1
      glue_version: "3.0"
      workers: 2
      worker_type: G.1X
      schema: "dbt_test_project"
      session_provisioning_timeout_in_seconds: 120
      location: "s3://aws-dbt-glue-datalake-1234567890-eu-west-1/"
      default_arguments: "--enable-metrics=true, --enable-continuous-cloudwatch-log=true, --enable-continuous-log-filter=true, --enable-spark-ui=true, --spark-event-logs-path=s3://bucket-to-write-sparkui-logs/dbt/"

If you want to use the Spark UI, you can launch the Spark history server using a AWS CloudFormation template that hosts the server on an EC2 instance, or launch locally using Docker. More information on Launching the Spark history server

Enabling AWS Glue Auto Scaling

Auto Scaling is available since AWS Glue version 3.0 or later. More information on the following AWS blog post: "Introducing AWS Glue Auto Scaling: Automatically resize serverless computing resources for lower cost with optimized Apache Spark"

With Auto Scaling enabled, you will get the following benefits:

• AWS Glue automatically adds and removes workers from the cluster depending on the parallelism at each stage or microbatch of the job run.

• It removes the need for you to experiment and decide on the number of workers to assign for your AWS Glue Interactive sessions.

• Once you choose the maximum number of workers, AWS Glue will choose the right size resources for the workload.

• You can see how the size of the cluster changes during the Glue Interactive sessions run by looking at CloudWatch metrics. More information on Monitoring your Glue Interactive Session.

Usage notes: AWS Glue Auto Scaling requires:

• To set your AWS Glue version 3.0 or later.
• To set the maximum number of workers (if Auto Scaling is enabled, the workers parameter sets the maximum number of workers)
• To set the --enable-auto-scaling=true parameter on your Glue Interactive Session Config (in your profile). More information on Job parameters used by AWS Glue

Profile config example

test_project:
  target: dev
  outputs:
    dev:
      type: glue
      query-comment: my comment
      role_arn: arn:aws:iam::1234567890:role/GlueInteractiveSessionRole
      region: eu-west-1
      glue_version: "3.0"
      workers: 2
      worker_type: G.1X
      schema: "dbt_test_project"
      session_provisioning_timeout_in_seconds: 120
      location: "s3://aws-dbt-glue-datalake-1234567890-eu-west-1/"
      default_arguments: "--enable-auto-scaling=true"

Access Glue catalog in another AWS account

In many cases, you may need to run you dbt jobs to read from another AWS account.

Review the following link https://repost.aws/knowledge-center/glue-tables-cross-accounts to set up access policies in source and target accounts

Add the following "spark.hadoop.hive.metastore.glue.catalogid=" to your conf in the DBT profile, as such, you can have multiple outputs for each of the accounts that you have access to.

Note: The access cross-accounts need to be within the same AWS Region

Profile config example

test_project:
  target: dev
  outputsAccountB:
    dev:
      type: glue
      query-comment: my comment
      role_arn: arn:aws:iam::1234567890:role/GlueInteractiveSessionRole
      region: eu-west-1
      glue_version: "3.0"
      workers: 2
      worker_type: G.1X
      schema: "dbt_test_project"
      session_provisioning_timeout_in_seconds: 120
      location: "s3://aws-dbt-glue-datalake-1234567890-eu-west-1/"
      conf: "--conf hive.metastore.client.factory.class=com.amazonaws.glue.catalog.metastore.AWSGlueDataCatalogHiveClientFactory 
             --conf spark.hadoop.hive.metastore.glue.catalogid=<TARGET-AWS-ACCOUNT-ID-B>"

Persisting model descriptions

Relation-level docs persistence is supported since dbt v0.17.0. For more information on configuring docs persistence, see the docs.

When the persist_docs option is configured appropriately, you'll be able to see model descriptions in the Comment field of describe [table] extended or show table extended in [database] like '*'.

Always schema, never database

Apache Spark uses the terms "schema" and "database" interchangeably. dbt understands database to exist at a higher level than schema. As such, you should never use or set database as a node config or in the target profile when running dbt-glue.

If you want to control the schema/database in which dbt will materialize models, use the schema config and generate_schema_name macro only. For more information, check the dbt documentation about custom schemas.

Tests

To perform a functional test:

1. Install dev requirements:

$ pip3 install -r dev-requirements.txt

2. Install dev locally

$ python3 setup.py build && python3 setup.py install_lib

3. Export variables

$ export DBT_S3_LOCATION=s3://mybucket/myprefix
$ export DBT_ROLE_ARN=arn:aws:iam::1234567890:role/GlueInteractiveSessionRole

4. Run the test

$ python3 -m pytest tests/functional

For more information, check the dbt documentation about testing a new adapter.

Caveats

Supported Functionality

Most dbt Core functionality is supported, but some features are only available with Apache Hudi.

Apache Hudi-only features:

1. Incremental model updates by unique_key instead of partition_by (see merge strategy)

Some dbt features, available on the core adapters, are not yet supported on Glue:

1. Persisting column-level descriptions as database comments
2. Snapshots

---

For more information on dbt:

• Read the introduction to dbt.
• Read the dbt viewpoint.
• Join the dbt community.

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Security

See CONTRIBUTING for more information.

License

This project is licensed under the Apache-2.0 License.