Talend Interview Questions and Answers for 10 years experience

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100 Talend Interview Questions & Answers (10 Years Experience)

  1. What are the different components of a Talend job?

    • Answer: A Talend job typically consists of components like tFileInput, tMap, tLogRow, tDBOutput, tRunJob, etc. These components are connected to form a data flow. The job also includes metadata definitions, job settings (like logging level and error handling), and potentially context variables.

  2. Explain the difference between tMap and tJavaRow components.

    • Answer: tMap is a graphical component used for data transformation and mapping between input and output schemas. It uses a visual interface for defining transformations. tJavaRow allows you to write custom Java code for more complex transformations not easily achievable with tMap's graphical interface. tJavaRow offers greater flexibility but requires Java programming skills.

  3. How do you handle error handling in Talend?

    • Answer: Talend offers several error handling mechanisms, including using the tLogRow component to log errors, using the tDie component to stop the job on errors, using onComponentOk and onComponentError triggers for conditional processing, and configuring global error handling settings in the job properties. Advanced techniques involve custom error handling routines within tJavaRow or using exception handling within custom code.

  4. Describe different types of Talend connections.

    • Answer: Talend supports various connection types, including database connections (e.g., JDBC, ODBC), file connections (local files, SFTP, FTP), cloud connections (AWS S3, Azure Blob Storage, Google Cloud Storage), and messaging connections (Kafka, MQ).

  5. Explain the concept of contexts in Talend.

    • Answer: Contexts in Talend allow you to parameterize your jobs. You can define different contexts with varying values for parameters like database connection details, file paths, or other configuration settings. This facilitates reusing the same job in different environments without modifying the job design itself.

  6. How do you schedule Talend jobs?

    • Answer: Talend jobs can be scheduled using Talend's built-in scheduler, or by integrating with external schedulers like Control-M, Autosys, or cron jobs (on Linux). The Talend scheduler allows configuring job execution frequency (hourly, daily, weekly, etc.) and time intervals.

  7. What are Talend routines and how are they used?

    • Answer: Talend routines are reusable Java functions that can be called from within Talend components. They are useful for encapsulating common logic or performing complex calculations. They enhance code reusability and maintainability.

  8. Explain the concept of Talend jobs and routes.

    • Answer: A Talend Job is a complete ETL process. A Talend Route is a lightweight, event-driven process suitable for real-time data processing and streaming. Routes are typically used for handling high-volume, low-latency data flows, whereas jobs are better suited for batch processing.

  9. How do you manage data lineage in Talend?

    • Answer: Talend provides data lineage tracking capabilities through its metadata management features. This allows you to trace the origin and transformation of data throughout your ETL processes, aiding in auditing, debugging, and impact analysis. This information can often be accessed through Talend Administration Center.

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