Request Syntax Request Parameters Response Syntax Response Elements Errors See Also

DiscoverInputSchema

Infers a schema for a SQL-based Kinesis Data Analytics application by evaluating sample records on the specified streaming source (Kinesis data stream or Kinesis Data Firehose delivery stream) or Amazon S3 object. In the response, the operation returns the inferred schema and also the sample records that the operation used to infer the schema.

You can use the inferred schema when configuring a streaming source for your application. When you create an application using the Kinesis Data Analytics console, the console uses this operation to infer a schema and show it in the console user interface.

Request Syntax


{
   "InputProcessingConfiguration": { 
      "InputLambdaProcessor": { 
         "ResourceARN": "string"
      }
   },
   "InputStartingPositionConfiguration": { 
      "InputStartingPosition": "string"
   },
   "ResourceARN": "string",
   "S3Configuration": { 
      "BucketARN": "string",
      "FileKey": "string"
   },
   "ServiceExecutionRole": "string"
}

Request Parameters

The request accepts the following data in JSON format.

InputProcessingConfiguration

The InputProcessingConfiguration to use to preprocess the records before discovering the schema of the records.

Type: InputProcessingConfiguration object

Required: No

InputStartingPositionConfiguration

The point at which you want Kinesis Data Analytics to start reading records from the specified streaming source for discovery purposes.

Type: InputStartingPositionConfiguration object

Required: No

ResourceARN

The Amazon Resource Name (ARN) of the streaming source.

Type: String

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

Pattern: arn:.*

Required: No

S3Configuration

Specify this parameter to discover a schema from data in an Amazon S3 object.

Type: S3Configuration object

Required: No

ServiceExecutionRole

The ARN of the role that is used to access the streaming source.

Type: String

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

Pattern: arn:.*

Required: Yes

Response Syntax


{
   "InputSchema": { 
      "RecordColumns": [ 
         { 
            "Mapping": "string",
            "Name": "string",
            "SqlType": "string"
         }
      ],
      "RecordEncoding": "string",
      "RecordFormat": { 
         "MappingParameters": { 
            "CSVMappingParameters": { 
               "RecordColumnDelimiter": "string",
               "RecordRowDelimiter": "string"
            },
            "JSONMappingParameters": { 
               "RecordRowPath": "string"
            }
         },
         "RecordFormatType": "string"
      }
   },
   "ParsedInputRecords": [ 
      [ "string" ]
   ],
   "ProcessedInputRecords": [ "string" ],
   "RawInputRecords": [ "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.

InputSchema

The schema inferred from the streaming source. It identifies the format of the data in the streaming source and how each data element maps to corresponding columns in the in-application stream that you can create.

Type: SourceSchema object

ParsedInputRecords

An array of elements, where each element corresponds to a row in a stream record (a stream record can have more than one row).

Type: Array of arrays of strings

ProcessedInputRecords

The stream data that was modified by the processor specified in the InputProcessingConfiguration parameter.

Type: Array of strings

RawInputRecords

The raw stream data that was sampled to infer the schema.

Type: Array of strings

Errors

InvalidArgumentException

The specified input parameter value is not valid.

HTTP Status Code: 400

InvalidRequestException

The request JSON is not valid for the operation.

HTTP Status Code: 400

ResourceProvisionedThroughputExceededException

Discovery failed to get a record from the streaming source because of the Kinesis Streams ProvisionedThroughputExceededException. For more information, see GetRecords in the Amazon Kinesis Streams API Reference.

HTTP Status Code: 400

ServiceUnavailableException

The service cannot complete the request.

HTTP Status Code: 500

UnableToDetectSchemaException

The data format is not valid. Kinesis Data Analytics cannot detect the schema for the given streaming source.

HTTP Status Code: 400

UnsupportedOperationException

The request was rejected because a specified parameter is not supported or a specified resource is not valid for this operation.

HTTP Status Code: 400