February 2026 monthly summary for facebook/folly focusing on business value and technical impact. This month centered on modernizing dependencies, reducing external dependency footprint, and strengthening runtime safety to support ongoing platform maintenance and performance goals.

2026-01 Monthly summary focusing on stability, reliability, and maintainability improvements across Buck2 and Folly. The month yielded a critical dependency cleanup aligned with Project White Lotus and targeted fixes to ensure artifact integrity in distributed build environments. Key features delivered: - Project White Lotus: Cleaned up dependencies in folly by removing redundant glog entries from external_deps when already present in exported_external_deps, across 308 BUCK/TARGETS files, eliminating 622 redundant entries to streamline builds and reduce maintenance burden. Major bugs fixed: - IncrementalJarOutputStream transfer completeness fixes across two repos to prevent jar corruption on RE worker filesystems: • Buck2-prelude: Fixed partial transfer in IncrementalJarOutputStreamImpl.transferFrom() (commit acfcc04d49b328f884990e3aa3114d1c8cea7468). • Buck2: Implemented the same transfer loop in IncrementalJarOutputStreamImpl.transferFrom() (commit 388346001f888f92d12b4a74c465b93830810f97). These changes ensure all bytes are copied, preventing EOFExceptions and corrupted jar files during packaging. Overall impact and accomplishments: - Substantially improved build reliability and artifact integrity in distributed environments, reducing CI failures due to jar corruption and incomplete transfers. - Streamlined dependency management in folly to support consolidation efforts under Project White Lotus, lowering ongoing maintenance costs and build noise. Technologies/skills demonstrated: - Java NIO FileChannel semantics and robust transfer loops; handling edge cases with filesystems that exhibit partial transfer behavior (RE worker FS). - Buck build system discipline (BUCK/TARGETS maintenance) and dependency management. - Cross-repo collaboration, code reviews, and differential revisions, reflecting strong coordination for reliability improvements.

June 2025 performance summary for facebook/buck2-prelude. Delivered IPA Packaging Optimization to improve packaging efficiency and reduce processing overhead. The change avoids double compression by skipping deflation of files already compressed, focusing on zstd-compressed assets, and updates the zip workflow to skip unnecessary work. This enhances CI speed and local build times, reducing CPU and I/O costs while preserving packaging correctness.

December 2024 monthly summary for facebook/buck2-prelude focusing on improving memory-safety and build reliability. Re-enabled AddressSanitizer leak detection in genrule builds by removing the ASAN_OPTIONS override, restoring memory-leak detection and ODR violation checks across genrule workflows to catch issues earlier in CI and development.