tGlobalVarLoad MapReduce properties - 6.4

Global variable

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Talend Documentation Team
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6.4
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Data Governance > Third-party systems > Custom code components (Integration) > Global variable components
Data Quality and Preparation > Third-party systems > Custom code components (Integration) > Global variable components
Design and Development > Third-party systems > Custom code components (Integration) > Global variable components
EnrichPlatform
Talend Studio

These properties are used to configure tGlobalVarLoad running in the MapReduce Job framework.

The MapReduce tGlobalVarLoad component belongs to the MapReduce family.

The information in this section is only for users who have subscribed to Talend Data Fabric or to any Talend product with Big Data, but it is not applicable to Talend Open Studio for Big Data users.

Basic settings

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. The schema is either Built-In or stored remotely in the Repository.

The columns of the schema are set to be variable keys and the data in these columns are the variable values.

 

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.

 

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.

Global Variables

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

Usage rule

This component is placed at the end of a process. It generates variables that the other Subjobs within the same Job can reuse by calling the globalMap.get() method.