Talend-Core-Developer Talend Core Certified Developer Exam Questions and Answers

Comprehensive and Detailed Explanation:

The Talend Trust Score™ is a feature of Talend Cloud Data Inventory that provides an assessment of a dataset's reliability and quality:​

Aggregates several metrics into a single score (Option A):

The Trust Score™ combines multiple factors, including validity, completeness, popularity, discoverability, and usage, into a single, comprehensive score. This aggregation helps users quickly gauge the overall trustworthiness of a dataset.​

Scales the Trust Score from 0 to 5 (Option C):

The Trust Score™ ranges from 0 to 5, with higher scores indicating better data quality and reliability. This standardized scale allows for easy comparison between datasets.​

Why not other options?

Option B:While data consumers can view and utilize the Trust Score™, it is automatically calculated by Talend based on specific metrics; users do not assign this score themselves.​

Option D:The Trust Score™ does not use a 0 to 10 scale; it specifically ranges from 0 to 5.​

Comprehensive and Detailed Explanation:

ThetRESTRequest componentsupportsOpenAPI Specification (OAS)/Swagger 2.0for initializing component endpoints, API mappings, and documentation.

OAS/Swagger 2.0 file (Correct Answer - Option D):

tRESTRequest allows API-first development by importing aSwagger 2.0 (OAS) definition.

This enables automatic configuration of API endpoints, request parameters, and response structures.

Why not other options?

CSV definition file (Option A):Not a valid API definition format.

XML definition file (Option B):XML files are not standard for REST API definitions.

WSDL file (Option C):WSDL is used for SOAP-based web services, not REST.

To build a job to run outside Talend Studio that must run on both Linux and Windows, you need to select Build Job because jobs are runnable on all platforms. The Build Job option allows you to export your job as an executable file that can be run independently from Talend Studio on any platform that supports Java. You can access this option by right-clicking on your job in the Repository tree view and selecting Build Job. This will open a dialog box where you can configure the build settings, such as destination folder, archive name, context, etc.

You do not need to specify All for the Shell launcher option in the Build Job window, configure the job properties before building the job, or build one package for each platform. These methods are not necessary or available in Talend Studio and may cause errors or unexpected results. References: Talend Open Studio: Open-source ETL and Free Data Integration | Talend, [Build Job - 7.3]

To create an empty Joblet, you need to right-click on the Joblet Designs node in the Repository tree view and select Create Joblet option. This will open a dialog box where you can enter the name and description of your Joblet and select an icon for it. You can then design your Joblet by adding components and links to it in the Designer workspace.

You cannot create an empty Joblet by creating an empty job, then exporting it as a Joblet by right-clicking it in the Repository, creating an empty job and using the file menu to save it as Joblet, or right-clicking a space in the Designer and selecting refactor to Joblet. These methods are not available in Talend Studio and may cause errors or unexpected results. References: Talend Open Studio: Open-source ETL and Free Data Integration | Talend, [Joblets - 7.3]

Comprehensive and Detailed Explanation:

After publishing a Job from Talend Studio to Talend Cloud, you can execute it using the Talend Management Console (TMC) by following these steps:​

Add a task and then run the task (Option A):

In TMC, navigate to theManagementsection and selectTasks.​

Click onAdd Task, choose the published artifact (your Job), configure necessary parameters, and save the task.​

Once the task is created, you can run it manually or schedule it for execution.​

Select the artifact name, add and configure a task, then run the task (Option D):

In TMC, go to theArtifactssection to view your published Jobs.​

Select the desired artifact and click onAdd Task.​

Configure the task settings as needed and save it.​

After creating the task, you can execute it immediately or set up a schedule.​

Why not other options?

Option B:TMC does not support directly running a Job by clicking on the artifact name without first creating a task.​

Option C:While you can select and configure an existing task, the initial step requires creating the task associated with the artifact.​

When you modify the schema of a component in Talend Studio, the application prompts you to propagate these changes. This propagation ensures that any alterations to the data structure are consistently applied throughout the Job, maintaining data integrity and coherence.

Understanding Schema Propagation:

Purpose:Schema propagation is essential to synchronize the data structure across connected components. When a schema changes (e.g., adding or removing a column), downstream components that rely on this schema need to be updated to reflect these changes.

Prompt Significance:The prompt serves as a confirmation to apply the schema changes to the subsequent components in the Job. By agreeing to propagate, Talend Studio automatically updates the schemas of all downstream components connected to the modified component.

Example Scenario:

Consider a Job where a tFileInputDelimited component reads data and passes it to a tMap component, which then outputs to a tFileOutputDelimited component. If you add a new column to the schema of tFileInputDelimited:

Modification:

You add a new column, 'emailAddress', to the tFileInputDelimited schema.

Propagation Prompt:

Upon making this change, Talend Studio prompts you to propagate the schema changes.

Effect of Propagation:

By confirming, the 'emailAddress' column is added to the schemas of all downstream components (e.g., tMap and tFileOutputDelimited). This ensures that these components recognize and can process the new column appropriately.

By understanding and utilizing schema propagation, you ensure that all components within your Talend Jobs remain synchronized, reducing errors and enhancing data processing efficiency.

Tags are used to mark specific points in the development lifecycle of a project. This can be done for a variety of reasons, such as:

To mark the completion of a major feature or release

To mark the start of a new development phase (e.g., QA, production)

To mark a known good state of the codebase (e.g., before a risky change)

Tags can be used to create branches, which can then be used to develop and test new features or bug fixes. They can also be used to deploy the codebase to different environments (e.g., development, staging, production).

Examples of when to use a tag:

When you are ready to release a new version of your application to production.

When you have completed a major feature or milestone in the development of your application.

Before making a risky change to your codebase, such as a database migration or refactoring.

When you need to deploy your application to a different environment, such as staging or production.

Benefits of using tags:

Tags can help you to keep track of the different versions of your codebase.

Tags can help you to roll back to a previous version of your codebase if necessary.

Tags can help you to deploy your codebase to different environments.

Tags can help you to collaborate with other developers more effectively.

Comprehensive and Detailed Explanation:

To manually pair a Remote Engine with Talend Cloud, you can set the pairing key using the following methods:​

In the Remote Engine web service page (Option B):

Access the Remote Engine's web interface, typically available at http://localhost:8043/configuration.​

Enter the pairing key obtained from the Talend Management Console.​

Click onPAIR REMOTE ENGINEto establish the connection.​

In the key configuration file of the engine (Option C):

Locate the preauthorized.key.cfg file in the Remote Engine's etc directory.​

Open the file and paste the pairing key into the remote.engine.pre.authorized.key parameter.​

Save the changes and restart the Remote Engine to apply the configuration.​

Why not other options?

Option A:Setting the pairing key in Talend Studio's preferences is not applicable for pairing a Remote Engine.​

Option D:While it's technically possible to pass the pairing key as a parameter in the engine's run script, it's not the standard or recommended method.​

To specify the remote JobServer to execute a job, you need to use the Target Exec tab in the Run view of Talend Studio. The Run view allows you to configure and execute your job from Talend Studio. The Target Exec tab allows you to select whether you want to run your job locally or remotely on a JobServer. A JobServer is a server application that allows you to execute jobs remotely from Talend Studio or Talend Administration Center. To run your job on a remote JobServer, you need to select Remote Jobserver option from the drop-down menu and select or add a JobServer connection from the list.

You do not need to use Job settings section of Project Settings window, Extra tab in Job view, or Run/Debug section in Preferences window. These windows are not used to specify remote JobServer execution. The Job settings section of Project Settings window is used to configure general settings for your jobs, such as versioning, statistics, logs, etc. The Extra tab in Job view is used to configure extra features for your job, such as implicit context load, tStatCatcher, tLogCatcher, etc. The Run/Debug section in Preferences window is used to configure run/debug settings for your Talend Studio, such as JVM arguments, execution mode, etc. References: Talend Open Studio: Open-source ETL and Free Data Integration | Talend, [Run view - 7.3], [Project Settings - 7.3], [Job view - 7.3], [Preferences - 7.3]

To call a different job within a job you are developing, you can use the tRunJob component. This component allows you to execute another job as a subjob within a parent job. To pass the parameters to the job you want to call, you can use the context parameters. Context parameters are variables that can store values that can be changed at runtime or between different contexts. You can define context parameters in the Contexts tab of your job and assign them values for each context. You can also pass context parameters from the parent job to the child job by using the Context Param tab of the tRunJob component. This way, you can parameterize the properties or expressions of the child job with the values from the parent job.

You do not need to use a file, command line options, or Java function parameters to pass parameters to a different job. These methods are not supported by Talend Studio and may cause errors or unexpected results. References: Talend Open Studio: Open-source ETL and Free Data Integration | Talend, [tRunJob properties - 7.3], [Contexts - 7.3]

To add a Joblet to your Talend Job, you can use one of these options:

Type the Joblet name on the Studio canvas, then select it from the Palette drop-down menu. This will create a Joblet container on your canvas that contains all the components and links of your Joblet.

Drag the Joblet from Repository tree view to designer canvas. This will also create a Joblet container on your canvas that contains all components and links of your Joblet.

Drag Joblet from Palette to design workspace. This will open a dialog box where you can select an existing Joblet from Repository or create a new one.

You cannot use a tRunJob component and select Joblet from drop-down menu, nor right-click Joblet from Palette and select Add option. These methods are not available in Talend Studio and may cause errors or unexpected results. References: Talend Open Studio: Open-source ETL and Free Data Integration | Talend, [Joblets - 7.3]

Comprehensive and Detailed Explanation:

In Talend Management Console (TMC), aplanis a sequence of tasks executed in a defined order. The types of tasks that can be added to a plan include:​

Jobs (Option D):Standard data integration tasks designed in Talend Studio.​

Big Data tasks (Option B):Tasks involving big data processing.​

Routes (Option C):Tasks related to messaging routes.​

However,Data services (Option A)refer to web services and are not typically added as tasks within a plan.​

To design a job that can run in two contexts, Test and Production, and run it as a standalone job outside Talend Studio, you need to do the following steps:

Define the context variables and values for each context in the Contexts tab of your job. A context variable is a variable that can store a value that can be changed at runtime or between different contexts. You can use context variables to parameterize the properties or expressions of your job components.

Build the job with the desired context selected in the Build Job window. You can access this option by right-clicking on your job in the Repository tree view and selecting Build Job. This will open a dialog box where you can configure the build settings, such as destination folder, archive name, context, etc. You need to select the context that you want to use for your job execution from the drop-down menu.

Extract the content of the archive file that contains your job executable files and libraries. The archive file also contains two executable files: a batch file (.bat) for Windows platforms and a shell script (.sh) for Linux platforms. You need to run the appropriate file for your platform by double-clicking on it or using a command line tool. This will launch the job and display its output in a console window.

If you need to run the job in a different context, you need to build a separate copy of the job with the other context selected in the Build Job window. You cannot change the context of an already built job without rebuilding it.

You do not need to build the job with the Context scripts option selected in the Build Job window, edit the script according to the context in which you want to run the job, set the desired context as the default, rebuild the job if you need to run it in a different context, or be prompted for the context. These methods are not correct or available in Talend Studio and may cause errors or unexpected results. References: Talend Open Studio: Open-source ETL and Free Data Integration | Talend, [Build Job - 7.3], [Contexts - 7.3]