Use the Amazon S3 Connector to get data from an Amazon S3 bucket into Decodable. If you are looking for information about how to create a connection to get data into Amazon S3 from Decodable, see AWS S3 in the Connect to a data destination chapter.


Connector name



source, sink

Delivery guarantee

exactly once

Create a connection to Amazon S3 using the Amazon S3 Connector


Before you can create the Amazon S3 connection, you must have an Identity and Access Management (IAM) role with the following policies. See the Setting up an IAM User section for more information.

  • A Trust Policy that allows access from Decodable’s AWS account. The ExternalId must match your Decodable account name.

  • A Permissions Policy with read and write permissions for the destination bucket.

Setting up an IAM User

The following is an example of what the Trust Policy should look like. Replace the <MY_DECODABLE_ACCOUNT_NAME> with your own. In the example, 671293015970 is Decodable’s AWS account ID and cannot be changed.

  "Version": "2012-10-17",
  "Statement": [
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::671293015970:root"
      "Action": "sts:AssumeRole",
      "Condition": {
        "StringEquals": {
          "sts:ExternalId": "<MY_DECODABLE_ACCOUNT_NAME>"
To allow several Decodable Accounts (say, in different AWS Regions) to write to the same bucket, use an array of Account names for the ExternalId value:
{ "sts:ExternalId": ["my-acct-1", "my-acct-2"] }

See AWS Identity and Access Management • The confused deputy problem for more information about why the ExternalId value is required.

You must also have read and write permissions on the destination S3 bucket. See the following list of permissions and replace <YOUR_BUCKET> and /some/dir appropriately. If you want to send data directly at the root level of the bucket, then leave the path blank with the trailing /* included.

  "Version": "2012-10-17",
  "Statement": [
      "Effect": "Allow",
      "Action": ["s3:PutObject", "s3:GetObject", "s3:DeleteObject"],
      "Resource": "arn:aws:s3:::<YOUR_BUCKET>/some/dir/*"
      "Effect": "Allow",
      "Action": ["s3:ListBucket"],
      "Resource": "arn:aws:s3:::<YOUR_BUCKET>"


  1. If you have an existing connection using the older version of the Amazon S3 Connector and would like to switch to the newest version, then do the following steps. If you are not upgrading an existing connection, skip these steps.

    1. Stop the existing Amazon S3 connection.

    2. Stop any pipelines that are using it.

  2. From the Connections page, select the Amazon S3 Connector and complete the following fields.

    UI Field Property Name in the Decodable CLI Description

    AWS Region


    Optional. The AWS region that your S3 bucket is located in. If not specified, defaults to your Decodable account region. For example, us-west-2.



    The file path to the bucket or directory that you want to send data to.

    For example, s3://bucket/directory.

    IAM Role ARN


    The AWS ARN of the IAM role.

    For example, arn:aws:iam::111222333444:role/decodable-s3-access.

    Partition Template


    Optional. The field names that you want to use to partition your data.

    For example, if you want to partition your data based on the datetime field, then enter datetime.

    Value Format


    The format for data in the Amazon S3 source. You can select one of the following:

    -JSON: See JSON Format Properties for information on what additional properties you can specify when using JSON format.

    - Parquet: See Parquet Format Properties for information on what additional properties you can specify when using Parquet format.

    - Raw

    Source folder polling frequently


    How often to scan the S3 bucket for new files. Defaults to 10 seconds.

  3. Select which stream to send the Amazon S3 records to. Then, select Next.

  4. Give the newly created connection a Name and Description and select Save.

  5. If you are replacing an existing Amazon S3 connection, then restart any pipelines that were processing data for the previous connection.


JSON Format Properties

The following properties are only applicable when format=json.

Property Required? Description



Specify the timestamp format for TIMESTAMP and TIMESTAMP_LTZ types. Defaults to SQL
SQL will use a "yyyy-MM-dd HH:mm:ss.SSS" format, e.g "2020-12-30 12:13:14.123"ISO-8601 will parse input TIMESTAMP in "yyyy-MM-ddTHH:mm:ss.SSS" format, e.g "2020-12-30T12:13:14.123"



Must be true or false, defaults to false.
When true, always encode numbers without scientific notation.
For example, a number encoded 2.7E-8 by default would be encoded 0.000000027.

Parquet Format Properties

The following properties are only applicable when format=parquet.

Property Description


Options are SNAPPY, GZIP and LZO. Defaults to no compression.

Other parquet options are available. See ParquetOutputFormat for more information.