Load external data into OPA - The Good, The Bad, and The Ugly

The guide discusses various methods for fetching data into Open Policy Agent (OPA), highlighting the pros and cons of each approach. It explores techniques such as including data in JWT tokens, overloading input within queries, polling with bundles, pushing data via API, pulling data during policy evaluation, and using the Open Policy Administration Layer (OPAL). Each method presents unique advantages and challenges, such as JWT's ease of use with limitations on data size, bundles' efficiency with static data, and OPAL's robust real-time updates that require more setup. The guide emphasizes understanding the complexities of data fetching mechanisms and choosing a method that aligns with the needs of specific applications, considering factors like real-time requirements and the ability to manage evolving access control complexities.

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