tFileOutputARFF Standard properties

Property type

Either Built-in or Repository.

Built-in: No property data stored centrally.

Repository: Select the repository file where the properties are stored. The fields that follow are completed automatically using the data retrieved.

Click this icon to open a connection wizard and store the Excel file connection parameters you set in the component Basic settings view.

For more information about setting up and storing file connection parameters, see Talend Studio User Guide.

File name

Name or path to the output file and/or the variable to be used.

For further information about how to define and use a variable in a Job, see Talend Studio User Guide.

Attribute Define

Displays the schema you defined in the Edit schema dialog box.

Column: Name of the column.

Type: Data type.

Pattern: Enter the data model (pattern), if necessary.

Relation

Enter the name of the relation.

Append

Select this check box to add the new rows at the end of the file.

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.

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 can create the schema and store it locally for this component. Related topic: see Talend Studio User Guide.

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

Create directory if not exists

This check box is selected by default. It creates a directory to hold the output table if it does not exist.

Don't generate empty file

Select this check box if you do not want to generate empty files.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at a 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 rule

Use this component along with a Row link to collect data from another component and to re-write the data to an ARFF file.

Dynamic settings

Click the [+] button to add a row in the table and fill the Code field with a context variable to choose your HDFS connection dynamically from multiple connections planned in your Job. This feature is useful when you need to access files in different HDFS systems or different distributions, especially when you are working in an environment where you cannot change your Job settings, for example, when your Job has to be deployed and executed independent of Talend Studio .

The Dynamic settings table is available only when the Use an existing connection check box is selected in the Basic settings view. Once a dynamic parameter is defined, the Component List box in the Basic settings view becomes unusable.

For examples on using dynamic parameters, see Reading data from databases through context-based dynamic connections and Reading data from different MySQL databases using dynamically loaded connection parameters. For more information on Dynamic settings and context variables, see Talend Studio User Guide.

Connections

Outgoing links (from this component to another):

Row: Main.

Trigger: On Subjob Ok; On Subjob Error; Run if.

Incoming links (from one component to this one):

Row: Main; Reject; Iterate.

Trigger: On Subjob Ok; On Subjob Error; Run if; On Component Ok; On Component Error; Synchronize; Parallelize.

For further information regarding connections, see Talend Studio User Guide.

Limitation

Due to license incompatibility, one or more JARs required to use this component are not provided. You can install the missing JARs for this particular component by clicking the Install button on the Component tab view. You can also find out and add all missing JARs easily on the Modules tab in the Integration perspective of your studio. For details, see Installing external modules. You can find more details about how to install external modules in Talend Help Center (https://help.talend.com).