Warning! The Event Loop May Be Blocked

Hatchet, a platform for managing background tasks and data pipelines at scale, often encounters issues with blocked event loops, which can cause warnings and performance bottlenecks. This problem frequently arises when using Hatchet's Python SDK due to blocking I/O operations within the event loop, typically caused by CPU-bound tasks or synchronous operations, such as API calls or database queries, that should not be run directly in async code. To address these issues, developers are advised to replace synchronous operations with asynchronous alternatives, offload CPU-bound work to separate threads using asyncio.to_thread, and use debugging tools like asyncio's DEBUG mode and OpenTelemetry Instrumentor to identify and resolve bottlenecks. By following these best practices, the performance of Hatchet workers can be optimized, reducing unnecessary task delays and mitigating the occurrence of alarming warning messages.

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