WAL-RUS: a Rust Rewrite of WAL-G for PostgreSQL Backups

ClickHouse Cloud has developed WAL-RUS, a Rust-based rewrite of the WAL-G backup tool for PostgreSQL, to address memory predictability issues encountered when running Postgres in resource-constrained environments. Unlike WAL-G's Go garbage-collected runtime, which makes memory usage unpredictable due to its "sawtooth" pattern of fluctuating virtual memory allocation, WAL-RUS provides direct memory control and bounded worker pools for more efficient resource management. The new tool maintains WAL-G compatibility while delivering the same backup and WAL archival functionality with improved memory efficiency and easier capacity planning.