Accessing buckets in the same AWS account under a managed policy

In certain scenarios, you might need to interact with data that resides outside of the data lake S3 buckets. You can add a bucket to S3, enable access to the bucket, and then, define external tables based on the data, such as a CSV file, you put into the bucket.

In this task, you see how to add access to an S3 bucket to create an external table based on CSV data using Data Explorer. You need to enable read/write access to the external S3 bucket before creating the table. From the command line of your cluster, you can run HDFS CLI commands on the S3 bucket. You can also use the S3 bucket for uploading a UDF jar for registration, and then include UDFs in queries from your cluster.

The S3 bucket you add to hold the data outside your Data Lake must be in the same AWS account as your Cloudera Data Warehouse service cluster.
Required role: DWAdmin

In this task, first you note the Managed Policy ARN attached to the Node Instance Role used while activating the cluster. Next, you edit the managed policy in the JSON file, for example noderole-inline-policy.json.

In your managed policy, locate the sid "putgetmybucketpaths" for editing.
Append resources to the resource section for the buckets you added.
For example, you added a bucket more-sales-data. To enable access to the more-sales-data bucket, you append resources to the end of the "resource" section, as shown in the last two resource names:
```
"Resource":[
...
"arn:aws:s3:::roohi-dl-bucket/backup/*",
    "arn:aws:s3:::more-sales-data",
    "arn:aws:s3:::more-sales-data/*"
 ],
```
important
There is no comma after the last line of the "Resource" section.
Click Review policy in the lower right corner of the page, and then click Save changes.
You can now access the more-sales-data bucket outside your data lake from Data Explorer in your Cloudera Data Warehouse service cluster. For example, you can create external Hive tables that point to the bucket, and join those external tables with tables already in your data lake. You can govern Cloudera Data Warehouse user access to this external S3 bucket using Ranger Hadoop SQL Policies.