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Backend ​

Open Library's backend is in a transition period. This page is a short overview of the core systems.

Current Stack ​

  • API direction: We are migrating API endpoints to FastAPI.
  • Endpoint lookup during migration: Use Endpoints (Transition) for current route/API pointers until FastAPI auto-docs are live.
  • Legacy framework: Much of the current app still runs on web.py via Infogami. See Backend General Guide and Understanding the Data Model.
  • Caching: We use memcached for performance and hot-path caching.
  • Database: We use PostgreSQL 9.3 and are working to migrate to a much newer version; upgrade work is tracked in issue #5675.
  • Search: We use Apache Solr for search indexing and query features. See Solr/Search Tech Guide.