Posts tagged with sre

Instagram EngineeringOct 17, 2019

Why it matters: Managing a multi-million line Python monolith requires addressing the risks of dynamic imports. Uncontrolled side effects and global state mutation slow down development cycles and introduce production instability, necessitating stricter module boundaries for performance and reliability.

Instagram's multi-million line Python monolith faces significant performance bottlenecks due to arbitrary code execution during module imports.
Import-time side effects like regex compilation and decorator execution prevent incremental reloading, causing server startup times of up to 60 seconds.
Unsafe import practices, such as fetching network configuration at the module level, lead to non-deterministic initialization failures and production risks.
The dynamic nature of Python allows for mutable global state, which often causes request pollution and test flakiness in large-scale environments.
Standard Python lacks explicit control over import order, making it difficult to prevent 'spooky action at a distance' bugs in complex dependency graphs.

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