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Amazon DynamoDB
API Reference (API Version 2012-08-10)

GetRecords

Retrieves the stream records from a given shard.

Specify a shard iterator using the ShardIterator parameter. The shard iterator specifies the position in the shard from which you want to start reading stream records sequentially. If there are no stream records available in the portion of the shard that the iterator points to, GetRecords returns an empty list. Note that it might take multiple calls to get to a portion of the shard that contains stream records.

Note

GetRecords can retrieve a maximum of 1 MB of data or 1000 stream records, whichever comes first.

Request Syntax

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{ "Limit": number, "ShardIterator": "string" }

Request Parameters

The request accepts the following data in JSON format.

Note

In the following list, the required parameters are described first.

ShardIterator

A shard iterator that was retrieved from a previous GetShardIterator operation. This iterator can be used to access the stream records in this shard.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

Required: Yes

Limit

The maximum number of records to return from the shard. The upper limit is 1000.

Type: Integer

Valid Range: Minimum value of 1.

Required: No

Response Syntax

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{ "NextShardIterator": "string", "Records": [ { "awsRegion": "string", "dynamodb": { "ApproximateCreationDateTime": number, "Keys": { "string" : { "B": blob, "BOOL": boolean, "BS": [ blob ], "L": [ "AttributeValue" ], "M": { "string" : "AttributeValue" }, "N": "string", "NS": [ "string" ], "NULL": boolean, "S": "string", "SS": [ "string" ] } }, "NewImage": { "string" : { "B": blob, "BOOL": boolean, "BS": [ blob ], "L": [ "AttributeValue" ], "M": { "string" : "AttributeValue" }, "N": "string", "NS": [ "string" ], "NULL": boolean, "S": "string", "SS": [ "string" ] } }, "OldImage": { "string" : { "B": blob, "BOOL": boolean, "BS": [ blob ], "L": [ "AttributeValue" ], "M": { "string" : "AttributeValue" }, "N": "string", "NS": [ "string" ], "NULL": boolean, "S": "string", "SS": [ "string" ] } }, "SequenceNumber": "string", "SizeBytes": number, "StreamViewType": "string" }, "eventID": "string", "eventName": "string", "eventSource": "string", "eventVersion": "string", "userIdentity": { "PrincipalId": "string", "Type": "string" } } ] }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

NextShardIterator

The next position in the shard from which to start sequentially reading stream records. If set to null, the shard has been closed and the requested iterator will not return any more data.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

Records

The stream records from the shard, which were retrieved using the shard iterator.

Type: array of Record objects

Errors

For information about the errors that are common to all actions, see Common Errors.

ExpiredIteratorException

The shard iterator has expired and can no longer be used to retrieve stream records. A shard iterator expires 15 minutes after it is retrieved using the GetShardIterator action.

HTTP Status Code: 400

InternalServerError

An error occurred on the server side.

HTTP Status Code: 500

LimitExceededException

Your request rate is too high. The AWS SDKs for DynamoDB automatically retry requests that receive this exception. Your request is eventually successful, unless your retry queue is too large to finish. Reduce the frequency of requests and use exponential backoff. For more information, go to Error Retries and Exponential Backoff in the Amazon DynamoDB Developer Guide.

HTTP Status Code: 400

ResourceNotFoundException

The operation tried to access a nonexistent stream.

HTTP Status Code: 400

TrimmedDataAccessException

The operation attempted to read past the oldest stream record in a shard.

In DynamoDB Streams, there is a 24 hour limit on data retention. Stream records whose age exceeds this limit are subject to removal (trimming) from the stream. You might receive a TrimmedDataAccessException if:

  • You request a shard iterator with a sequence number older than the trim point (24 hours).

  • You obtain a shard iterator, but before you use the iterator in a GetRecords request, a stream record in the shard exceeds the 24 hour period and is trimmed. This causes the iterator to access a record that no longer exists.

HTTP Status Code: 400

Example

Retrieve stream records from a shard

The following sample retrieves all the stream records from a shard. To do this, it uses a ShardIterator that was obtained from a previous GetShardIterator call.

Sample Request

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POST / HTTP/1.1 x-amzn-RequestId: <RequestID> x-amzn-crc32: <CRC32> Content-Type: application/x-amz-json-1.0 Content-Length: <PayloadSizeBytes> X-Amz-Date: <Date> X-Amz-Target: DynamoDBStreams_20120810.GetRecords { "ShardIterator": "arn:aws:dynamodb:us-west-2:111122223333:table/Forum/stream/2015-05-20T20:51:10.252|1|AAAAAAAAAAEvJp6D+zaQ... <remaining characters omitted> ..." }

Sample Response

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HTTP/1.1 200 OK x-amzn-RequestId: <RequestId> x-amz-crc32: <Checksum> Content-Type: application/x-amz-json-1.0 Content-Length: <PayloadSizeBytes> Date: <Date> { "NextShardIterator": "arn:aws:dynamodb:us-west-2:111122223333:table/Forum/stream/2015-05-20T20:51:10.252|1|AAAAAAAAAAGQBYshYDEe ... <remaining characters omitted> ...", "Records": [ { "awsRegion": "us-west-2", "dynamodb": { "ApproximateCreationDateTime": 1.46480431E9, "Keys": { "ForumName": {"S": "DynamoDB"}, "Subject": {"S": "DynamoDB Thread 3"} }, "SequenceNumber": "300000000000000499659", "SizeBytes": 41, "StreamViewType": "KEYS_ONLY" }, "eventID": "e2fd9c34eff2d779b297b26f5fef4206", "eventName": "INSERT", "eventSource": "aws:dynamodb", "eventVersion": "1.0" }, { "awsRegion": "us-west-2", "dynamodb": { "ApproximateCreationDateTime": 1.46480527E9, "Keys": { "ForumName": {"S": "DynamoDB"}, "Subject": {"S": "DynamoDB Thread 1"} }, "SequenceNumber": "400000000000000499660", "SizeBytes": 41, "StreamViewType": "KEYS_ONLY" }, "eventID": "4b25bd0da9a181a155114127e4837252", "eventName": "MODIFY", "eventSource": "aws:dynamodb", "eventVersion": "1.0" }, { "awsRegion": "us-west-2", "dynamodb": { "ApproximateCreationDateTime": 1.46480646E9, "Keys": { "ForumName": {"S": "DynamoDB"}, "Subject": {"S": "DynamoDB Thread 2"} }, "SequenceNumber": "500000000000000499661", "SizeBytes": 41, "StreamViewType": "KEYS_ONLY" }, "eventID": "740280c73a3df7842edab3548a1b08ad", "eventName": "REMOVE", "eventSource": "aws:dynamodb", "eventVersion": "1.0" } ] }

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: