tMap properties - 6.1

Talend Open Studio for Big Data Components Reference Guide

Talend Open Studio for Big Data
Data Governance
Data Quality and Preparation
Design and Development
Talend Studio

Component family



Basic settings

Map editor

It allows you to define the tMap routing and transformation properties.


If you do not want to handle execution errors, you can click the Property Settings button at the top of the input area and select the Die on error check box (selected by default) in the [Property Settings] dialog box. It will kill the Job if there is an error.


Mapping links display as

Auto: the default setting is curves links

Curves: the mapping display as curves

Lines: the mapping displays as straight lines. This last option allows to slightly enhance performance.

  Temp data directory path Enter the path where you want to store the temporary data generated for lookup loading. For more information on this folder, see Talend Studio User Guide.



The preview is an instant shot of the Mapper data. It becomes available when Mapper properties have been filled in with data. The preview synchronization takes effect only after saving changes.

Advanced settings Max buffer size (nb of rows) Type in the size of physical memory, in number of rows, you want to allocate to processed data.
  Ignore trailing zeros for BigDecimal Select this check box to ignore trailing zeros for BigDecimal data.

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.


Possible uses are from a simple reorganization of fields to the most complex Jobs of data multiplexing or demultiplexing transformation, concatenation, inversion, filtering and more...


If you are using a subscription-based version of the Studio, 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


The use of tMap supposes minimum Java knowledge in order to fully exploit its functionalities.

This component is a junction step, and for this reason cannot be a start nor end component in the Job.