tCassandraOutputBulkExec – Docs for ESB 5.x

Component family

Big Data / Cassandra

Function

tCassandraOutputBulkExec receives
data from the preceding component, creates an SSTable and then
writes the SSTable into Cassandra.

Purpose

tCassandraOutputBulkExec is a
dedicated component which improves performance during Insert
operations to a column family of a Cassandra keyspace.

Basic settings

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.

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.

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

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

Column family

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

Partitioner

Select the partitioner which determines how the data is
distributed across the Cassandra cluster.

For more information about the partitioner, see http://wiki.apache.org/cassandra/Partitioners.

Column name comparator

Select the data type for the column names, which is used to sort
columns.

For more information about the comparators, see http://www.datastax.com/docs/1.1/ddl/column_family#about-data-types-comparators-and-validators.

SSTable directory

Specify the local directory for the SSTable. Note that the
complete path to the SSTable will be the local directory appended by
the specified keyspace name and column family name.

For example, if you set the local directory to /home/talend/sstable, and specify
testk as the keyspace name
and testc as the column family
name, the complete path to the SSTable will be /home/talend/sstable/testk/testc/.

Buffer size

Advanced settings

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

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 mainly used when no particular transformation is
required on the data to be loaded into the database.

Limitation

Currently, the execution of this component ends the entire
Job.