`s3` is a source plugin that reads events from [Amazon Simple Storage Service (Amazon S3)](https://aws.amazon.com/s3/) objects. It requires an [Amazon Simple Queue Service (Amazon SQS)](https://aws.amazon.com/sqs/) queue that receives [S3 Event Notifications](https://docs.aws.amazon.com/AmazonS3/latest/userguide/NotificationHowTo.html). 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](#codec). You can also configure the `s3` source to use [Amazon S3 Select](https://docs.aws.amazon.com/AmazonS3/latest/userguide/selecting-content-from-objects.html) 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:
If your S3 objects or Amazon SQS queues do not use [AWS Key Management Service (AWS KMS)](https://aws.amazon.com/kms/), remove the `kms:Decrypt` permission.
## Configuration
You can use the following options to configure the `s3` source.
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]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/pipelines/#end-to-end-acknowledgments) when events are received by OpenSearch sinks.
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`.
region | No | String | The AWS Region to use for credentials. Defaults to [standard SDK behavior to determine the Region](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/region-selection.html).
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](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials.html).
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]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/parse-json/) processor to parse each line.
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.
expression | Yes, when using `s3_select` | String | The expression used to query the object. Maps directly to the [expression](https://docs.aws.amazon.com/AmazonS3/latest/API/API_SelectObjectContent.html#AmazonS3-SelectObjectContent-request-Expression) property.
expression_type | No | String | The type of the provided expression. Default value is `SQL`. Maps directly to the [ExpressionType](https://docs.aws.amazon.com/AmazonS3/latest/API/API_SelectObjectContent.html#AmazonS3-SelectObjectContent-request-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](https://docs.aws.amazon.com/AmazonS3/latest/API/API_InputSerialization.html#AmazonS3-Type-InputSerialization-CompressionType).
csv | No | [csv](#s3_select_csv) | Provides the CSV configuration for processing CSV data.
json | No | [json](#s3_select_json) | Provides the JSON configuration for processing JSON data.
### csv<a name="s3_select_csv"></a>
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](https://docs.aws.amazon.com/AmazonS3/latest/API/API_CSVInput.html) data type.
Option | Required | Type | Description
:--- |:---------|:------------| :---
file_header_info | No | String | Describes the first line of input. Maps directly to the [FileHeaderInfo](https://docs.aws.amazon.com/AmazonS3/latest/API/API_CSVInput.html#AmazonS3-Type-CSVInput-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](https://docs.aws.amazon.com/AmazonS3/latest/API/API_CSVInput.html#AmazonS3-Type-CSVInput-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](https://docs.aws.amazon.com/AmazonS3/latest/API/API_CSVInput.html#AmazonS3-Type-CSVInput-Comments) property.
#### json<a name="s3_select_json"></a>
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](https://docs.aws.amazon.com/AmazonS3/latest/API/API_JSONInput.html#AmazonS3-Type-JSONInput-Type) property.
*`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.
### Timers
*`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.
