June 2026: Delivered CUDA-event-based synchronization for Velox hash join to ensure build-probe ordering across GPU streams, reducing nondeterministic behavior and preventing premature probe execution. Implemented by capturing a build-ready CUDA event after build input concatenation and hash_join construction on the build stream, publishing it in CudfHashJoinBridge, and making probe streams wait on the event before consuming hash_join objects. Allocated UCX exchange buffers via cuDF device resource to maintain consistent device/resource usage with the rest of the cuDF path. Validated with TPC-H Q18 correctness loop against DuckDB reference, compute-sanitizer stream-ordered checks, and GPU TPC-H smoke tests. PR #17758 (D108667292) merged; reviewed by kgpai; pulled by kagamiori. fbshipit-source-id: 9bca2e2947cdaedcad2dcc59dd1bdf758480943b

In March 2026, Velox focused on hardening build stability for CentOS Stream 9 by correcting gflags registration in ldconfig, reducing runtime errors in downstream builds and improving reliability for dependent projects like fbthrift. The fix ensures the gflags library is discoverable at runtime by the system's linker, aligning installation paths with ldconfig expectations and preventing libgflags.so.2.2 errors during downstream compilation.

January 2026 monthly summary focusing on stabilizing Velox test quality after cudf 26.02 upgrade. Implemented test adjustments and validation to preserve reliability and accelerate downstream integration with upstream cudf changes.

August 2025 monthly summary for mhaseeb123/cudf focusing on delivering business value through improved developer experience and maintainability. The primary change this month reorganized the libcudf-example resources to enhance discoverability and navigation, with a traceable commit ensuring the directory structure is preserved.