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Pg_karnak: Transactional schema migration across tenant databases
Dive deep into the architecture of pg_karnak, PostgreSQL extension, metadata stroe and transaction coordinator designed for reliable and scalable schema migrations across many tenants and Postgres instances. This post explores PostgreSQL internals, including extension hooks, transaction lifecycle, and locking mechanisms, offering insights into building scalable, reliable systems for distributed applications.
Both hybrid and db-per-tenant architectures require a way to propagate the DDL changes to all the tenants instantaneously with great devex and high reliability. To understand how these components work together to execute a DDL statement, let's look at what happens when a user connects to their Nile database and issues a CREATE TABLE command. Nile focuses on solving these multi-tenant challenges systematically at the database level, addressing the issues every engineer encounters but few platforms tackle comprehensively.
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