tCassandraOutput – Docs for ESB 5.x

Component family

Big Data / Cassandra

Function

tCassandraOutput receives data
from the preceding component, and writes data into Cassandra.

Purpose

tCassandraOutput allows you to
write data into or delete data from a column family of a Cassandra
keyspace.

Basic settings

Use existing connection

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

DB Version

Select the Cassandra version you are using.

Host

Hostname or IP address of the Cassandra server.

Port

Listening port number of the Cassandra server.

Required authentication

Select this check box to provide credentials for the Cassandra
authentication.

This check box appears only if you do not select the Use existing connection check box.

Username

Fill in this field with the username for the Cassandra
authentication.

Password

Fill in this field with the password for the Cassandra
authentication.

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

Keyspace configuration

Keyspace

Type in the name of the keyspace into which you want to write
data.

Action on keyspace

Select the operation you want to perform on the keyspace of
interest:

Column family
configuration

Type in the name of the column family into which you want to write
data.

Column family type

Standard: Column family is of
standard type.

Super: Column family is of super
type.

Action on column family

Select the operation you want to perform on the column family of
interest:

Action on data

On the data of the table defined, you can perform:

Schema and Edit schema

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

Since version 5.6, both the Built-In mode and the Repository mode are
available in any of the Talend solutions.

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

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.

When the schema to be reused has default values that are integers or functions, ensure that
these default values are not enclosed within quotation marks. If they are, you must remove
the quotation marks manually.

For more details, see https://help.talend.com/display/KB/Verifying+default+values+in+a+retrieved+schema.

Sync columns

Click this button to retrieve schema from the previous component
connected in the Job.

Row key column

Select the row key column from the list.

Include row key in
columns

Select this check box to include row key in columns.

Super columns

Select the super column from the list.

This drop-down list appears only if you select Super from the Column family type drop-down list.

Include super columns in standard
columns

Select this check box to include the super columns in standard
columns.

Delete row

Select this check box to delete the row.

This check box appears only if you select Delete from the Action on
data drop-down list.

Delete columns

Customize the columns you want to delete.

Delete super columns

Select this check box to delete super columns.

This check box appears only if you select the Delete Row check box.

Advanced settings

Batch Size

Number of lines in each processed batch.

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 read by an input component or
transferred to an output component. This is an After variable and it returns an
integer.

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

This component is used as an output component and it always needs
an incoming link.

Log4j

The activity of this component can be logged using the log4j feature. For more information on this feature, see Talend Studio User
Guide.

For more information on the log4j logging levels, see the Apache documentation at http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html.

Limitation

n/a