DynamoDBExportDataFormat

Applies a schema to an DynamoDB table to make it accessible by a Hive query. Use DynamoDBExportDataFormat with a HiveCopyActivity object and DynamoDBDataNode or S3DataNode input and output. DynamoDBExportDataFormat has the following benefits:

• Provides both DynamoDB and Amazon S3 support

• Allows you to filter data by certain columns in your Hive query

• Exports all attributes from DynamoDB even if you have a sparse schema

Note

DynamoDB Boolean types are not mapped to Hive Boolean types. However, it is possible to map DynamoDB integer values of 0 or 1 to Hive Boolean types.

Example

The following example shows how to use HiveCopyActivity and DynamoDBExportDataFormat to copy data from one DynamoDBDataNode to another, while filtering based on a time stamp.

{
  "objects": [
    {
      "id" : "DataFormat.1",
      "name" : "DataFormat.1",
      "type" : "DynamoDBExportDataFormat",
      "column" : "timeStamp BIGINT"
    },
    {
      "id" : "DataFormat.2",
      "name" : "DataFormat.2",
      "type" : "DynamoDBExportDataFormat"
    },
    {
      "id" : "DynamoDBDataNode.1",
      "name" : "DynamoDBDataNode.1",
      "type" : "DynamoDBDataNode",
      "tableName" : "item_mapped_table_restore_temp",
      "schedule" : { "ref" : "ResourcePeriod" },
      "dataFormat" : { "ref" : "DataFormat.1" }
    },
    {
      "id" : "DynamoDBDataNode.2",
      "name" : "DynamoDBDataNode.2",
      "type" : "DynamoDBDataNode",
      "tableName" : "restore_table",
      "region" : "us_west_1",
      "schedule" : { "ref" : "ResourcePeriod" },
      "dataFormat" : { "ref" : "DataFormat.2" }
    },
    {
      "id" : "EmrCluster.1",
      "name" : "EmrCluster.1",
      "type" : "EmrCluster",
      "schedule" : { "ref" : "ResourcePeriod" },
      "masterInstanceType" : "m1.xlarge",
      "coreInstanceCount" : "4"
    },
    {
      "id" : "HiveTransform.1",
      "name" : "Hive Copy Transform.1",
      "type" : "HiveCopyActivity",
      "input" : { "ref" : "DynamoDBDataNode.1" },
      "output" : { "ref" : "DynamoDBDataNode.2" },
      "schedule" : { "ref" : "ResourcePeriod" },
      "runsOn" : { "ref" : "EmrCluster.1" },
      "filterSql" : "`timeStamp` > unix_timestamp(\"#{@scheduledStartTime}\", \"yyyy-MM-dd'T'HH:mm:ss\")"
    },
    {
      "id" : "ResourcePeriod",
      "name" : "ResourcePeriod",
      "type" : "Schedule",
      "period" : "1 Hour",
      "startDateTime" : "2013-06-04T00:00:00",
      "endDateTime" : "2013-06-04T01:00:00"
    }
  ]
}

Syntax

Optional Fields	Description	Slot Type
column	Column name with datatype specified by each field for the data described by this data node. Ex: hostname STRING	String
parent	Parent of the current object from which slots will be inherited.	Reference Object, e.g. "parent":{"ref":"myBaseObjectId"}

Runtime Fields	Description	Slot Type
@version	Pipeline version the object was created with.	String

System Fields	Description	Slot Type
@error	Error describing the ill-formed object	String
@pipelineId	Id of the pipeline to which this object belongs to	String
@sphere	The sphere of an object denotes its place in the lifecycle: Component Objects give rise to Instance Objects which execute Attempt Objects	String