AWS Glue Triggers
AWS Glue Triggers are used to coordinate the execution of ETL Jobs and Crawlers. Within a complex ETL workflow, certain jobs may need to complete before others, or multiple jobs may need to be triggered based on a specific event. AWS Glue supports event-based, on-demand, and scheduled triggers, allowing you to create or activate workflows based on specific conditions, such as completion or failure of previous jobs, or time-based scheduling. Triggers enable you to maintain a more efficient ETL process by coordinating tasks and minimizing unnecessary processing or mechanical sympathy.
AWS Glue Triggers Guide
AWS Glue Triggers are essential components within the AWS ecosystem and specifically in AWS Glue, which is a fully managed extract, transform, and load (ETL) service.
Why are AWS Glue Triggers Important?
AWS Glue Triggers allow automated ETL jobs to start on-demand, on a schedule, or even by event conditions, enabling efficient and sophisticated data processing and general ETL tasks.
What are AWS Glue Triggers?
A trigger in AWS Glue is a mechanism that starts AWS Glue jobs and crawlers. Triggers can initiate other triggers, establishing ambitious workflows. It’s possible to create conditional workflows where triggers only activate if previous jobs are successful.
How Do AWS Glue Triggers Work?
Triggers in AWS Glue employ three activation approaches: scheduled, on-demand, and job events. The first operates within a user-defined schedule, the second starts when explicitly initiated, and the third initiates when a specified job either fails, succeeds, or stops.
Exam Tips: Answering Questions on AWS Glue Triggers:
1. Familiarize with Trigger Types: Understanding the different types of triggers (on-demand, scheduled, event-based) is crucial for the exam.
2. Understand Trigger Workflows: Be comfortable with how triggers can form workflows, with one trigger initiating another based on the state of a job.
3. AWS Glue Jobs and Crawlers: Comprehend how triggers work in relation to AWS Glue jobs and crawlers. Know how to set up and manage triggers.
4. Know Trigger States: Be aware of trigger states such as CREATED, ACTIVATING, ACTIVATED, DEACTIVATING, DEACTIVATED.
5. Conditional Workflows: Understand the concept of conditional trigger workflows, where triggers can be event-based depending on the success or failure of certain jobs.
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