tRiakOutput Standard properties

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. When you create a Spark Job, avoid the reserved word line when naming the fields.

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.

Built-In: You create and store the schema locally for this component only.

Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs.

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 information, see the related description of retrieving table schemas in Talend Studio User Guide.

Use existing connection

Select this check box and in the Component List drop-down list, select the desired connection component to reuse the connection details you already defined.

If you select the Use an existing connection check box, the Nodes table will not be available.

Nodes

Fill in the information required for a connection to a Riak cluster.

• Host: enter the IP address or hostname of a Riak node in the Riak cluster that you want to connect to.

• Port: enter the listening port number of a Riak node. You can leave this field empty to use its default value 8098.

• Riak path: enter the Riak path for accessing a Riak node. You can leave this field empty to use its defalt value riak.

One example of the URL for accessing a Riak node is http://127.0.0.1:8098/riak.

For more information about the concepts related to Riak, see https://docs.basho.com/riak/kv/2.2.0/learn/concepts/.

Bucket

Specify the name of the bucket to which you want to apply changes.

Action on data

In the specified bucket, you can perform:

• Upsert: Insert data if they do not exist or update the existing data.

• Delete: Remove values associated with the specified key.

If you select Delete from the Action on data list, only the Key column list is available in the Key area.

Auto generate the key

Select this check box to let the Riak system generate keys for the values automatically.

Key column

Select one column from the list to write its data into the Riak bucket as keys. Note that the key must be unique across one bucket.

Value columns

Customize the columns to write their data into the Riak bucket as values.

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

UPSERT_NB_LINE: the number of rows inserted and updated. This is an After variable and it returns an integer.

DELETE_NB_LINE: the number of rows deleted. 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 rule

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