Table of Contents
What Is the Role of tSetGlobalVar in Creating Job-Wide Variables?
A detailed guide on the tSetGlobalVar component in Talend, explaining how it creates and manages global variables accessible across the entire job. Learn how this feature facilitates communication between different subjobs and workflows.
Question
What happens when you configure a TSetGlobalVar component in Talend?
A. It executes Java code row by row
B. It stores schema details of input data
C. It creates global variables accessible across the entire job
D. It deletes predefined context variables
Answer
C. It creates global variables accessible across the entire job
Explanation
TSetGlobalVar provides reusable values. The tSetGlobalVar component is used to create or update global variables that are accessible throughout the entire execution of a Talend job. It populates the globalMap, a special hash map that stores key-value pairs which can be retrieved and used by other components within the same job.
The Functionality of tSetGlobalVar
The tSetGlobalVar component provides a user-friendly interface for setting globalMap variables without writing Java code in a tJava or tJavaRow component. In its basic properties, you can define one or more key-value pairs. When the job flow reaches this component, it either creates a new entry in the globalMap or updates the value of an existing key.
This capability is especially useful for passing information between disconnected subjobs. For example, a value calculated in one data flow (subjob 1) can be stored in the globalMap using tSetGlobalVar. Later, a separate data flow (subjob 2), connected by a trigger like OnSubjobOk, can retrieve this value from the globalMap for further processing.
Why Other Options Are Incorrect
A. It executes Java code row by row: This describes the function of the tJavaRow component, which is designed for row-level transformations in a data flow.
B. It stores schema details of input data: tSetGlobalVar does not handle schemas or data flows directly. It is designed to store simple key-value pairs, not complex data structures like schemas.
D. It deletes predefined context variables: tSetGlobalVar operates on the globalMap, which is distinct from the context map. It has no capability to delete context variables; its purpose is to create and update global variables.
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