Access key and Secret
key

Specify the access keys (the access key ID in the Access
Key field and the secret access key in the Secret
Key field) required to access the Amazon Web Services. For more
information on AWS access keys, see Access keys (access key ID and secret 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

If you temporarily need some access permissions associated
to an AWS IAM role that is not granted to your user account, select this check box to
assume that role. Then specify the values for the following parameters to create a new
assumed role session.

Region

Specify the AWS region by selecting a region name from the list or
entering a region between double quotation marks (for example “us-east-1”). For more information about
how to specify the AWS region, see Choose an AWS Region.

Filter master and core instances

Select this check box to ignore the master and core instance groups
and list only the task instance groups.

Cluster id

Enter the ID of the cluster for which you want to list the instance
groups.

STS Endpoint

Select this check box and in the field displayed, specify the
AWS Security Token Service endpoint, for example, sts.amazonaws.com, 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

CURRENT_GROUP_ID: the ID of the current instance group.
This is an After variable and it returns a string.

CURRENT_GROUP_NAME: the name of the current instance
group. This is an After 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

tAmazonEMRListInstances is usually
used as a start component of a Job or subJob.