Access Key

Enter the access key ID that uniquely identifies an AWS Account. For
further information about how to get your Access Key and Secret Key, see Getting Your AWS Access
Keys.

Secret Key

Enter the secret access key, constituting the security credentials in
combination with the access Key.

To enter the secret key, click the […] button next to
the secret key field, and then in the pop-up dialog box enter the password between double
quotes and click OK to save the settings.

Inherit credentials from AWS role

Select this check box to leverage the instance profile credentials. These
credentials can be used on Amazon EC2 instances, and are delivered through the Amazon EC2
metadata service. To use this option, your Job must be running within Amazon EC2 or other
services that can leverage IAM Roles for access to resources. For more information, see Using an IAM Role to Grant Permissions to
Applications Running on Amazon EC2 Instances.

Assume role

Use End Point

Select this check box and in the Server Url field
displayed, specify the Web service URL of the DynamoDB database service.

Region

Specify the AWS region by selecting a region name from the list or entering
a region between double quotation marks (e.g. “us-east-1”) in the
list. For more information about the AWS Region, see Regions and Endpoints.

Action

Select the operation to be performed from the drop-down list, either
Query or Scan. For more information, see Query and Scan Operations
in DynamoDB.

Schema and Edit
schema

A schema is a row description. It defines the number of fields (columns) to
be processed and passed on to the next component. The schema is either Built-In or stored remotely in the Repository.

• Built-In: You create and store the
  schema locally for this component only. Related topic: see
  Talend Studio
  
  User Guide.

• Repository: You have already created
  the schema and stored it in the Repository. You can reuse it in various projects and
  Job designs. Related topic: see
  Talend Studio
  
  User Guide.

Click Edit schema to make changes to the schema.
If the current schema is of the Repository type, three
options are available:

• View schema: choose this option to view the
  schema only.

• Change to built-in property: choose this
  option to change the schema to Built-in for
  local changes.

• Update repository connection: choose this
  option to change the schema stored in the repository and decide whether to propagate
  the changes to all the Jobs upon completion. If you just want to propagate the
  changes to the current Job, you can select No
  upon completion and choose this schema metadata again in the [Repository Content] window.

Table Name

Specify the name of the table to be queried or scanned.

Use advanced key condition expression

Select this check box and in the Advanced key
condition expression field displayed, specify the key
condition expressions used to determine the items to be read from the
table or index.

Key condition expression

Specify the key condition expressions used to determine the items to
be read. Click the [+] button to add as
many rows as needed, each row for a key condition expression, and set
the following attributes for each expression:

• Key Column: Enter the name of
  the key column.

• Function: Select the function
  for the key condition expression.

• Value1: Specify the value
  used in the key condition expression.

• Value2: Specify the second
  value used in the key condition expression if needed, depending
  on the function you selected.

Note that only the items that meet all the key conditions defined in
this table can be returned.

This table is not available when the Use
advanced key condition expression check box is
selected.

Use filter expression

Select this check box to use the filter expression for the query or
scan operation.

Use advanced filter expression

Select this check box and in the Advanced filter
expression field displayed, specify the filter
expressions used to refine the data after it is queried or scanned and
before it is returned to you.

This check box is available when the Use filter
expression check box is selected.

Filter expression

Specify the filter expressions used to refine the results returned to
you. Click the [+] button to add as
many rows as needed, each row for a filter expression, and set the
following attributes for each expression:

• Column: Enter the name of the
  column used to refine the results.

• Function: Select the function
  for the filter expression.

• Value1: Specify the value
  used in the filter expression.

• Value2: Specify the second
  value used in the filter expression if needed, depending on the
  function you selected.

Note that only the items that meet all the filter conditions defined
in this table can be returned.

This table is available when the Use filter
expression check box is selected and the Use advanced filter expression check box is
cleared.

Value mapping

Specify the placeholders for the expression attribute values.

• value: Enter the expression attribute
  value.

• placeholder: Specify the placeholder for the
  corresponding value.

For more information, see Expression Attribute Values.

Name mapping

Specify the placeholders for the attribute names that conflict with
the DynamoDB reserved words.

• name: Enter the name of the
  attribute that conflicts with a DynamoDB reserved word.

• placeholder: Specify the
  placeholder for the corresonding attribute name.

For more information, see Expression Attribute Names.

STS Endpoint

Select this check box and in the field displayed, specify the AWS Security Token
Service endpoint where session credentials are retrieved from.

This check box is available only when the Assume
role check box is selected.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at the Job level
as well as at each component level.

Global Variables

NB_LINE: the number of rows processed. This is an After
variable and it returns an integer.

QUERY: the query statement being processed. This is a Flow
variable and it returns a string.

ERROR_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error check box is
cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl +
Space to access the variable list and choose the variable to use from it.

For further information about variables, see
Talend Studio

User Guide.

Usage rule

This component is usually used as a start component of a Job or Subjob and it
always needs an output link.

Use an existing connection

Select this check box and in the Component
List click the relevant connection component to reuse the connection
details you already defined.

Access
Key

Enter the access key ID that uniquely identifies an AWS Account. For
further information about how to get your Access Key and Secret Key, see Getting Your AWS Access
Keys.

Secret
Key

Enter the secret access key, constituting the security credentials in
combination with the access Key.

To enter the secret key, click the […] button next to
the secret key field, and then in the pop-up dialog box enter the password between double
quotes and click OK to save the settings.

Region

Specify the AWS region by selecting a region name from the list or entering
a region between double quotation marks (e.g. “us-east-1”) in the
list. For more information about the AWS Region, see Regions and Endpoints.

Use End Point

Select this check box and in the Server Url field
displayed, specify the Web service URL of the DynamoDB database service.

Schema and Edit
schema

A schema is a row description. It defines the number of fields (columns) to
be processed and passed on to the next component. The schema is either Built-In or stored remotely in the Repository.

• Built-In: You create and store the
  schema locally for this component only. Related topic: see
  Talend Studio
  
  User Guide.

• Repository: You have already created
  the schema and stored it in the Repository. You can reuse it in various projects and
  Job designs. Related topic: see
  Talend Studio
  
  User Guide.

Click Edit schema to make changes to the schema.
If the current schema is of the Repository type, three
options are available:

• View schema: choose this option to view the
  schema only.

• Change to built-in property: choose this
  option to change the schema to Built-in for
  local changes.

• Update repository connection: choose this
  option to change the schema stored in the repository and decide whether to propagate
  the changes to all the Jobs upon completion. If you just want to propagate the
  changes to the current Job, you can select No
  upon completion and choose this schema metadata again in the [Repository Content] window.

Table Name

Specify the name of the table from which you need to read data.

Number of scan segments

Enter, without using quotation marks, the number of segments for the parallel scan.

Number of partitions

Enter, without using quotation marks, the maximum number of partitions into which you want
Spark to split the input data so that the Spark executors can process the data in parallel.
It is recommended to put a number less or equal to the number of segments.

Throughput read percent

Enter, without using quotation marks, the percentage (expressed in decimal) to be used of
the read capacity pre-defined in Amazon. The rest of this capacity is spared for other
non-
Talend
applications. For further information about this read
capacity, see Provision throughput for read.

Advanced settings

Add properties to define extra operations you need tDynamoDBInput to perform when reading data.

This table is present for future evolution of the component and using it requires the
high-level knowledge of DynamoDB development. Currently, there are no interesting user
configurable properties.

Usage rule

This component is used as a start component and requires an output link..

This component should use a tDynamoDBConfiguration
component present in the same Job to connect to a DynamoDB database. You need to drop a
tDynamoDBConfiguration component alongside this
component and configure the Basic settings of this
component to use tDynamoDBConfiguration.

This component, along with the Spark Batch component Palette it belongs to, appears only
when you are creating a Spark Batch Job.

Note that in this documentation, unless otherwise
explicitly stated, a scenario presents only Standard Jobs,
that is to say traditional
Talend
data integration Jobs.

Spark Connection

This connection is effective on a per-Job basis.