# AWS Athena (Pre-release)

Amazon’s serverless, interactive query service that lets you analyze data directly in Amazon S3 using standard SQL.

## Supported Connection Methods

Available methods for connections to the target system from Lumi AI:

* [x] **Direct** 

  *The default / typical connection option. Interfaces directly with the target system over the Internet with no mediation. Suitable for most cloud-hosted scenarios or public-facing resources. See* [*Network Configuration*](https://docs.lumi-ai.com/using-lumi/network-configuration) *for more details.*
* [ ] **Gateway**\
  \&#xNAN;*An alternative connection method leveraging a Lumi AI Data Gateway. This uses Lumi AI's purpose-built connection agent to mediate communications. Ideal for restricting access to systems within a protected network. For more information, see* [*Data Gateway*](https://docs.lumi-ai.com/product-features/data-gateway)*.* 

## Supported Limits

The following are limits that can be configured for the system to moderate access and usage from users in Lumi AI:

* [ ] **Cost Limit**\
  \&#xNAN;*Before running a query, if the system supports it, the system-specific compute cost (or surrogate) estimate will be processed and compared to an organization-level/admin-set cost limit for systems of this type (if configured/set). If exceeded, the query will not run (and either the workflow will attempt an optimization or the user will be notified).*
* [ ] **Duration Limit**\
  \&#xNAN;*An alternative to cost, queries will be stopped the system supports a duration/timeout limit and one is set/configured at the organization level (across systems).*

## Available Parameters

These properties are the essential source system connection properties that all queries are directed towards.

*\* Required parameters*

{% hint style="info" %}
Note: The Gateway parameter is common to all systems (when supported) and is only available when gateway is the selected connection method.
{% endhint %}

<details>

<summary>AWS Role ARN*</summary>

The ARN (Amazon Resource Name) of the IAM role that will be assumed by Lumi to run queries against Athena.

👍 **Valid Examples**

* `arn:aws:iam::123456789012:role/lumi-athena-query-runner`

&#x20;:thumbsdown: **Invalid Examples**

* `123456789012:role/lumi-athena-query-runner`
* `lumi-athena-query-runner`&#x20;

</details>

<details>

<summary>AWS Region*</summary>

AWS Region where Athena and S3 staging bucket resides in.

:thumbsup: **Valid Examples**

* `us-east-1`
* `us-west-2`

:thumbsdown: **Invalid Examples**

* `US-East-1`
* `North America`

</details>

<details>

<summary>S3 Staging Directory*</summary>

The S3 URI (bucket + optional prefix) where Athena writes its query results

:thumbsup: **Valid Examples**

* `s3://my-athena-bucket`
* `s3://my-athena-bucket/staging`

:thumbsdown: **Invalid Examples**

* `/s3/my-athena-bucket`
* `my-athena-bucket`

</details>

<details>

<summary>Database*</summary>

The Athena database name.

👍 **Valid Examples**

* `analytics`
* `default`

:thumbsdown: **Invalid Examples**

* `AwsDataCatalog.analytics`
* `analytics.products`

</details>

<details>

<summary>AWS External ID*</summary>

AWS External ID. Can be any arbitrary string that matches `aws-external-id` of the cross-account IAM role (see below).

👍 **Valid Examples**

* `6ee2f609-cb2c-4d66-b39b-a3a13985b622`

:thumbsdown: **Invalid Examples**

* Empty string

</details>

## System Permissions & Configuration

You will need to create cross-account IAM role whose trust policy allows Lumi's AWS account to run queries against Athena.

### Create IAM policy with access to your Athena instance

1. Navigate to IAM -> Policies -> Create policy.
2. Select the JSON option and paste the following snippet, replacing `<your-data-bucket>` with `<your-athena-staging-bucket>` with the name of your S3 Athena data bucket and S3 your staging (query results)  bucket, respectively.\
   \
   /

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "AllowAthenaAccess",
      "Effect": "Allow",
      "Action": [
        "athena:StartQueryExecution",
        "athena:GetQueryExecution",
        "athena:GetQueryResults",
        "athena:ListQueryExecutions",
        "athena:ListDatabases",
        "athena:ListTableMetadata",
        "athena:GetTableMetadata"
      ],
      "Resource": "*"
    },
    {
      "Sid": "AllowGlueAccess",
      "Effect": "Allow",
      "Action": [
        "glue:GetDatabases",
        "glue:GetDatabase",
        "glue:GetTables",
        "glue:GetTable"
      ],
      "Resource": "*"
   },
    {
      "Sid": "AllowDataBucketReadAccess",
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket",
        "s3:GetObject"
      ],
      "Resource": [
        "arn:aws:s3:::<your-data-bucket>",
        "arn:aws:s3:::<your-data-bucket>/*"
      ]
    },
    {
      "Sid": "AllowStagingBucketReadWriteAccess",
      "Effect": "Allow",
      "Action": [
        "s3:GetBucketLocation",
        "s3:ListBucket",
        "s3:GetObject",
        "s3:PutObject"
      ],
      "Resource": [
        "arn:aws:s3:::<your-athena-staging-bucket>",
        "arn:aws:s3:::<your-athena-staging-bucket>/*"
      ]
    }
  ]
}

```

3. Click Next.
4. Name the policy **AthenaQueryPermissions** and click Create Policy.

### Create a Cross-Account IAM Role with the above IAM policy

1. Navigate to IAM → Roles → Create role.
2. Select Custom trust policy option and paste the following snippet, replacing `<lumi-account-id>` with Lumi's Account ID  (provided during onboarding) and `<aws-external-id>` with AWS external ID (can be any arbitrary string)

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::<lumi-account-id>:root"
      },
      "Action": "sts:AssumeRole",
      "Condition": {
        "StringEquals": {
          "sts:ExternalId": "<aws-external-id>"
        }
      }
    },
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::<lumi-account-id>:root"
      },
      "Action": "sts:TagSession"
    }
  ]
}
```

3. Click Next.
4. In the Permissions policies, search for **AthenaQueryPermissions** and select it.
5. Click Next.
6. Name the role **LumiAI**-**athena-query-runner** and click Create Role.