February 2026 monthly summary for apache/incubator-gluten: Focused on enabling cudf-based plan validation through a configuration flag and addressing cudf validation issues to improve reliability and safety of cudf operator paths. The work delivered supports customers deploying cudf workloads with confidence and reduces deployment risk by validating plans that utilize cudf operators.

Month: 2026-01 — Concise monthly summary for apache/incubator-gluten focusing on delivering business value and technical excellence across architecture, memory management, and validation improvements. Key features delivered: - Arrow: IBM Power (ppc64le) Architecture Support: Added JNI patch to recognize ppc64le and adjust loading, enabling Arrow usage on IBM Power systems. (Commit: 7054ada998e9758180171a50aa1f9603fa249a9f) - Gluten: Scenario for unsupported aggregate functions and docs: Added scenario for unsupported aggregates and updated docs/scripts to reflect changes in aggregate function support. (Commit: 0f0b8c0810bea53cd7b786b9a6e90268719e9216) - Spark/QA: Testing enhancements for Spark 4.1 explain and Velox AQE: Expanded test framework and coverage, enabling parameterized queries and previously ignored tests for validation and metrics. (Commits: bfdb9eb5efaace96a0e9bed1c58ae2ed5caee537; 04697ec5ecb6cadf878f4e1ca9c7896336a2d05b) Major bugs fixed: - ArrowMemoryPool race condition fix and memory logging improvements: Fixed race condition in ArrowMemoryPool, simplified destructor, and improved memory usage logging for more reliable memory management in concurrent environments. (Commit: 3349e8d9653cbea056b2dbb5ff3fb721a787d60f) - WholeStageTransformerExec: Ensure unique transform stage IDs: Address issue with generation of unique transform stage IDs; updated code to use a new rule for ID generation for accurate stage identification. (Commit: 60bf4b74269057e4a800546942b07e1b77411d25) Overall impact and accomplishments: - Expanded hardware support and feature validation, enabling use of Arrow on IBM Power systems and improving reliability for concurrent workloads. - Improved memory safety and observability, reducing risk of memory-related failures in production workloads. - Strengthened correctness of query planning/execution tracking and aggregation support, with better guidance and tooling for developers and users. Technologies/skills demonstrated: - JNI integration and architecture-specific loading, cross-platform compatibility. - Memory management, concurrency debugging, and enhanced logging for observability. - Debugging and patching of execution planning (WholeStageTransformerExec) to ensure correct stage tracking. - Test automation and framework enhancements for Spark 4.1 explain and Velox AQE, including enabling previously ignored tests and parameterized validation.

December 2025 delivered reliability improvements for streaming queries and filter optimization across gluten and velox, with targeted tests and clearer configuration names to reduce operational risk and technical debt. The work enhances streaming query stability, correctness of filter operations, and maintainability of core components, aligning with Velox changes.

November 2025 (apache/incubator-gluten). This month focused on stabilizing Spark 4.0 compatibility in the Gluten testing framework, hardening Velox-backed execution paths, and improving build/deploy tooling. Key outcomes include targeted test-suite fixes for Spark 4.0, Bloom filter enhancements, and shuffle/partition performance gains, underpinned by streamlined deployment automation and CI reliability improvements. These efforts reduce upgrade risk for customers moving to Spark 4.0, accelerate validation feedback, and improve runtime performance in Velox-backed paths.

October 2025 monthly summary for apache/incubator-gluten. Focused on delivering a flexible build setup to support multi-command builds and stabilizing the setup scripts. Implemented an enhanced setup script capable of handling multiple commands within a single build flow, improving reliability, reproducibility, and contributor experience. This work reduces CI failures and accelerates onboarding for new contributors, aligning with goals to strengthen the build pipeline and developer productivity.

September 2025: Delivered cross-repo improvements in gluten and velox focused on performance, observability, reliability, and testing hygiene. In apache/incubator-gluten, implemented shuffle system performance improvements with a new shuffle reader, code cleanup, and enhanced metrics for shuffle input, driving better throughput and visibility for shuffle workloads. Added Velox backend lazy vector load metrics and updated related operator metrics to improve end-to-end performance measurement. Reorganized C++ test utilities and refined the build system to compile test utilities only when tests or benchmarks are enabled, reducing build times and footprint. In IBM/velox, improved LZ4 error reporting for compression/decompression and added tests to guard against corrupted data, raising the quality bar for data integrity. Also introduced DynamicSasTokenClientProvider to renew ABFS SAS tokens proactively, increasing reliability of Azure Blob Storage access. These efforts collectively improve runtime efficiency, observability, reliability, and developer productivity across data access and processing pipelines.

August 2025 across gluten and velox delivered targeted feature improvements, critical fixes, and architectural refinements focused on maintainability, platform stability, and extensibility of storage/auth integration. Notable work includes enhancing how unsupported functions are reported with a dedicated exception path and updated docs generation, removing legacy accelerators to simplify the codebase and reallocate resources, introducing a FileSystemType enum with modular getHiveConfig to support distinct S3/GCS/ABFS configurations, macOS build/test stabilization for VeloxShuffleWriterTest, and enabling custom Google Cloud Storage authentication via a GCS OAuth credentials provider.

Delivery overview for 2025-07: Implemented nesting and unnest enhancements, stability improvements, and observability in the Apache Gluten project. The work focused on Velox backend features, shuffle backend capabilities, and metrics/logging, enabling richer analytics, reliable large-scale processing, and better task visibility. Key business value: - Enables advanced SQL with outer explode/posexplode/inline functions and nested data handling. - Improves performance tuning and data movement with Celeborn shuffle writer support for sort and rss_sort. - Enhances operational visibility for long-running tasks through event log metrics. Key features delivered: - Outer explode, posexplode, and inline functions support in Velox backend (commit d5d2aca32ab73b3e088ed9d930fb3ecf37698f72; GLUTEN-8332). - Celeborn shuffle writer supports both sort and rss_sort types (commit 804ab4d3447802043e0c86196fd3bbfb55d89269; GLUTEN-10244). - Task metrics logging to event log for long-running Velox tasks with threshold config and unit alignment (commits dddf086a31c37334773ee62a4dab3feca33d05fa and 6596e52887ffa25b9bdb80637e15cb8a488238a8; GLUTEN-10118, GLUTEN-10119). Major bugs fixed: - Incorrect partition lengths during sort shuffle spill; fixes in LocalPartitionWriter/RssPartitionWriter; added sortSpill test (commit 792283dadc94d2004d503db4a07d1a2a07a9229a; GLUTEN-10168). - Segfault in sort shuffle reader fixed via buffer reallocation and robust EOF handling; comprehensive deserializer test parameterization (commit 7e97354e6c7452e892bb0b1f2541386a181b2e8e; GLUTEN-10192). Overall impact and accomplishments: - Strengthened correctness and stability of shuffle/spill paths, enabling reliable large-scale data processing. - Expanded feature set for nested data operations and performance tuning backends. - Enhanced observability and metrics groundwork for proactive performance management. Technologies/skills demonstrated: - Velox backend and C++ backend changes, GenerateExecTransformer adjustments, and end-to-end handling of unnest operations. - Buffer management, deserialization, and end-of-stream handling improvements. - Metrics, MetricsUtil integration and event-log emission. - Config-driven feature flags and backend selection for shuffle writers (Celeborn).

June 2025 monthly summary for apache/incubator-gluten focusing on performance optimization of the shuffle path, extensibility through plugin-based shuffle managers, correctness fixes, and architecture/quality improvements. Key work spanned threshold tuning for sort-based columnar shuffle, bug fix for map task ID tracking, new SupportsColumnarShuffle trait enabling dynamic manager plugins, dictionary encoding for hash-based shuffles with Velox backend updates, and internal architecture refinements including memory pool strategy changes and JNI writer/partition writer refactors. These changes improve shuffle throughput for smaller partitions, reduce risk of incorrect task tracking, enable flexible plugin-based configurations, and improve test/documentation workflows.

May 2025: Delivered core architectural and quality improvements in gluten, including removing the parquet-arrow dependency and refactoring the build (CMake and core C++ components) to reduce dependency surface and improve deployment flexibility; enhanced shuffle path with writer improvements for better memory management, payload merging, and robustness; fixed Apple Clang-specific JNI/HugeINT conversion issues with safer memory handling and improved error reporting; added documentation clarifications for Velox task metrics printing to help operators monitor performance; overall, these changes reduce deployment risk, increase shuffle stability, improve cross-language compatibility, and enhance observability with minimal runtime cost.

April 2025 performance summary for apache/incubator-gluten focusing on stability, performance, and maintainability. Key work this month targeted memory resilience in large-scale shuffle workloads, improved IO throughput through stream-based compression and granular buffer configuration, and strengthened maintainability through documentation and test/benchmark cleanup. The combined efforts reduced OOM risk in Celeborn shuffle reads, provided tunable performance across backends, and clarifed function support while trimming test noise.

March 2025 monthly summary for apache/incubator-gluten: Delivered key features and stability improvements across test infrastructure, documentation automation, and cross-platform build reliability. The work enhanced maintainability, onboarding, and platform parity, driving faster verification cycles and broader usage scenarios.

February 2025 monthly summary for the apache/incubator-gluten project (2 features, 1 test suite stabilization effort). Focused on reliability, observability, and Spark-version compatibility to reduce production incidents and ease debugging, while maintaining strong delivery momentum across the Gluten codebase.