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Background jobs have become an essential component of any Ruby infrastructure, and, as the Sidekiq Best Practices remind us, it is essential that jobs be "idempotent and transactional." But how do we make our jobs idempotent and transactional? In this talk, we will explore various techniques to make our jobs robust and ACIDic.
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In Stephen Margheim's talk titled 'Acidic Jobs: A Layman's Guide to Job Bliss' at RubyConf 2021, he delves into the fundamental principles that make background jobs in Ruby robust, focusing on the importance of idempotency and transactionality. The discussion outlines that jobs are critical as they represent actions that mutate state within applications. These jobs must be well-designed, ensuring that they can be safely retried and provide guarantees about data integrity through ACID properties of transactions. Stephen elaborates on key points: - **Definition of Jobs:** A job is not merely an instance of active job but represents a state mutation that produces side effects and does not return values. - **Core Principles:** Jobs must primarily be idempotent (safe to repeat without adverse effects) and transactional (ensuring that all operations complete successfully together). - **ACID Guarantees:** He describes the foundational aspects of databases like Atomicity, Consistency, Isolation, and Durability which help enforce these principles. - **Techniques for Implementation:** - Using database records to create transactional jobs. - Implementing uniqueness constraints to manage job executions effectively. - Staging jobs in the database first to ensure they respect transactional boundaries. - Dividing complex operations into manageable steps to maintain control and clarity while executing. Stephen provides practical insights and techniques to build resilient jobs, touching on the work of Nathan Griffith and others to enhance his points. He advocates for a new gem he’s developing named 'acidic job', aimed at providing the community with tools to create robust and flexible background jobs. The significant takeaway is that by utilizing SQL’s ACID properties and carefully structuring job execution, developers can create jobs that are resilient and reliable, significantly improving the robustness of Ruby applications. He encourages ongoing conversation in community channels for collaboration and further insight into building resilient systems.
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