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s3 source

s3 is a source plugin that reads events from Amazon Simple Storage Service (Amazon S3) objects. It requires an Amazon Simple Queue Service (Amazon SQS) queue that receives S3 Event Notifications. After Amazon SQS is configured, the s3 source receives messages from Amazon SQS. When the SQS message indicates that an S3 object was created, the s3 source loads the S3 objects and then parses them using the configured codec. You can also configure the s3 source to use Amazon S3 Select instead of Data Prepper to parse S3 objects.

IAM permissions

In order to use the s3 source, configure your AWS Identity and Access Management (IAM) permissions to grant Data Prepper access to Amazon S3. You can use a configuration similar to the following JSON configuration:

    "Version": "2012-10-17",
    "Statement": [
            "Sid": "s3-access",
            "Effect": "Allow",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::<YOUR-BUCKET>/*"
            "Sid": "sqs-access",
            "Effect": "Allow",
            "Action": [
            "Resource": "arn:aws:sqs:<YOUR-REGION>:<123456789012>:<YOUR-SQS-QUEUE>"
            "Sid": "kms-access",
            "Effect": "Allow",
            "Action": "kms:Decrypt",
            "Resource": "arn:aws:kms:<YOUR-REGION>:<123456789012>:key/<YOUR-KMS-KEY>"

If your S3 objects or Amazon SQS queues do not use AWS Key Management Service (AWS KMS), remove the kms:Decrypt permission.


You can use the following options to configure the s3 source.

Option Required Type Description
notification_type Yes String Must be sqs.
compression No String The compression algorithm to apply: none, gzip, or automatic. Default value is none.
codec Yes Codec The codec to apply.
sqs Yes sqs The SQS configuration. See sqs for details.
aws Yes aws The AWS configuration. See aws for details.
on_error No String Determines how to handle errors in Amazon SQS. Can be either retain_messages or delete_messages. If retain_messages, then Data Prepper will leave the message in the Amazon SQS queue and try again. This is recommended for dead-letter queues. If delete_messages, then Data Prepper will delete failed messages. Default value is retain_messages.
buffer_timeout No Duration The amount of time allowed for for writing events to the Data Prepper buffer before timeout occurs. Any events that the Amazon S3 source cannot write to the buffer in this time will be discarded. Default value is 10 seconds.
records_to_accumulate No Integer The number of messages that accumulate before writing to the buffer. Default value is 100.
metadata_root_key No String Base key for adding S3 metadata to each Event. The metadata includes the key and bucket for each S3 object. Defaults to s3/.
disable_bucket_ownership_validation No Boolean If true, the S3Source will not attempt to validate that the bucket is owned by the expected account. The expected account is the same account that owns the Amazon SQS queue. Defaults to false.
acknowledgments No Boolean If true, enables s3 sources to receive end-to-end acknowledgments when events are received by OpenSearch sinks.


The following parameters allow you to configure usage for Amazon SQS in the s3 source plugin.

Option Required Type Description
queue_url Yes String The URL of the Amazon SQS queue from which messages are received.
maximum_messages No Integer The maximum number of messages to receive from the Amazon SQS queue in any single request. Default value is 10.
visibility_timeout No Duration The visibility timeout to apply to messages read from the Amazon SQS queue. This should be set to the amount of time that Data Prepper may take to read all the S3 objects in a batch. Default value is 30s.
wait_time No Duration The amount of time to wait for long polling on the Amazon SQS API. Default value is 20s.
poll_delay No Duration A delay to place between reading/processing a batch of Amazon SQS messages and making a subsequent request. Default value is 0s.


Option Required Type Description
region No String The AWS Region to use for credentials. Defaults to standard SDK behavior to determine the Region.
sts_role_arn No String The AWS Security Token Service (AWS STS) role to assume for requests to Amazon SQS and Amazon S3. Defaults to null, which will use the standard SDK behavior for credentials.
aws_sts_header_overrides No Map A map of header overrides that the IAM role assumes for the sink plugin.


The codec determines how the s3 source parses each S3 object.

newline codec

The newline codec parses each single line as a single log event. This is ideal for most application logs because each event parses per single line. It can also be suitable for S3 objects that have individual JSON objects on each line, which matches well when used with the parse_json processor to parse each line.

Use the following options to configure the newline codec.

Option Required Type Description
skip_lines No Integer The number of lines to skip before creating events. You can use this configuration to skip common header rows. Default is 0.
header_destination No String A key value to assign to the header line of the S3 object. If this option is specified, then each event will contain a header_destination field.

json codec

The json codec parses each S3 object as a single JSON object from a JSON array and then creates a Data Prepper log event for each object in the array.

csv codec

The csv codec parses objects in comma-separated value (CSV) format, with each row producing a Data Prepper log event. Use the following options to configure the csv codec.

Option Required Type Description
delimiter Yes Integer The delimiter separating columns. Default is ,.
quote_character Yes String The character used as a text qualifier for CSV data. Default is ".
header No String list The header containing the column names used to parse CSV data.
detect_header No Boolean Whether the first line of the S3 object should be interpreted as a header. Default is true.

Using s3_select with the s3 source

When configuring s3_select to parse S3 objects, use the following options.

Option Required Type Description
expression Yes, when using s3_select String The expression used to query the object. Maps directly to the expression property.
expression_type No String The type of the provided expression. Default value is SQL. Maps directly to the ExpressionType.
input_serialization Yes, when using s3_select String Provides the S3 Select file format. Amazon S3 uses this format to parse object data into records and returns only records that match the specified SQL expression. May be csv, json, or parquet.
compression_type No String Specifies an object’s compression format. Maps directly to the CompressionType.
csv No csv Provides the CSV configuration for processing CSV data.
json No json Provides the JSON configuration for processing JSON data.


Use the following options in conjunction with the csv configuration for s3_select to determine how your parsed CSV file should be formatted.

These options map directly to options available in the S3 Select CSVInput data type.

Option Required Type Description
file_header_info No String Describes the first line of input. Maps directly to the FileHeaderInfo property.
quote_escape No String A single character used for escaping the quotation mark character inside an already escaped value. Maps directly to the QuoteEscapeCharacter property.
comments No String A single character used to indicate that a row should be ignored when the character is present at the start of that row. Maps directly to the Comments property.


Use the following option in conjunction with json for s3_select to determine how S3 Select processes the JSON file.

Option Required Type Description
type No String The type of JSON array. May be either DOCUMENT or LINES. Maps directly to the Type property.


The s3 source includes the following metrics.


  • s3ObjectsFailed: The number of S3 objects that the s3 source failed to read.
  • s3ObjectsNotFound: The number of S3 objects that the s3 source failed to read due to an S3 “Not Found” error. These are also counted toward s3ObjectsFailed.
  • s3ObjectsAccessDenied: The number of S3 objects that the s3 source failed to read due to an “Access Denied” or “Forbidden” error. These are also counted toward s3ObjectsFailed.
  • s3ObjectsSucceeded: The number of S3 objects that the s3 source successfully read.
  • sqsMessagesReceived: The number of Amazon SQS messages received from the queue by the s3 source.
  • sqsMessagesDeleted: The number of Amazon SQS messages deleted from the queue by the s3 source.
  • sqsMessagesFailed: The number of Amazon SQS messages that the s3 source failed to parse.


  • s3ObjectReadTimeElapsed: Measures the amount of time the s3 source takes to perform a request to GET an S3 object, parse it, and write events to the buffer.
  • sqsMessageDelay: Measures the time elapsed from when S3 creates an object to when it is fully parsed.

Distribution summaries

  • s3ObjectSizeBytes: Measures the size of S3 objects as reported by the S3 Content-Length. For compressed objects, this is the compressed size.
  • s3ObjectProcessedBytes: Measures the bytes processed by the s3 source for a given object. For compressed objects, this is the uncompressed size.
  • s3ObjectsEvents: Measures the number of events (sometimes called records) produced by an S3 object.

Example: Uncompressed logs

The following pipeline.yaml file shows the minimum configuration for reading uncompressed newline-delimited logs:

    notification_type: sqs
    compression: none
      queue_url: ""
      region: "us-east-1"
      sts_role_arn: "arn:aws:iam::123456789012:role/Data-Prepper"