apache/incubator-gluten
Oct 2024 – Jul 2025
8 Months active
Languages Used
JavaScalaGit ConfigurationC++MarkdownXMLYAMLShell
Technical Skills
Backend DevelopmentData EngineeringSQLSparkAggregate FunctionsBig Data
Kaifei Yi
PROFILE
Kaifei Yi
Yikai Fei contributed to the apache/incubator-gluten repository by engineering robust backend features and configuration systems that improved maintainability and cross-version compatibility. Over eight months, he delivered end-to-end Hive/Parquet interoperability, refactored configuration management using Scala and Java, and enhanced Spark integration with automated testing infrastructure. His work included formalizing governance with the GPIP process, optimizing broadcast joins, and tuning Velox backend performance for Spark 3.4/3.5. He addressed memory management and compression alignment issues, implemented automated configuration generation, and improved documentation reliability. The depth of his contributions is reflected in the breadth of backend, data engineering, and CI/CD improvements.
Overall Statistics
Feature vs Bugs
70%Features
Repository Contributions
31Total
Bugs
7
Commits
31
Features
16
Lines of code
18,765
Activity Months8
Your Network
717 people
Work History
July 2025
2 Commits • 1 Features
Jul 1, 2025July 2025 monthly highlights for apache/incubator-gluten: delivered automated configuration generation and reinforced configuration validation, along with a targeted Parquet config bug fix. The work strengthens configuration governance, improves documentation reliability, and enhances overall stability across Gluten configurations.
2 Commits • 1 Features
Jul 1, 2025July 2025 monthly highlights for apache/incubator-gluten: delivered automated configuration generation and reinforced configuration validation, along with a targeted Parquet config bug fix. The work strengthens configuration governance, improves documentation reliability, and enhances overall stability across Gluten configurations.
July 2025
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025 — Apache incubator-gluten: Strengthened testing infrastructure and UI reliability to improve confidence before releases and reduce CI noise. Delivered Spark Version Compatibility Testing Infrastructure by refactoring test APIs to standardize how Spark versions are specified, and updated test macros across backends (ClickHouse, Velox, Delta, Hudi, Iceberg) to improve version compatibility management and testability. Fixed UI Testing Stability and Correctness by stabilizing tests through disabling Spark UI to prevent flakiness in VeloxUdfSuite and GlutenTestsTrait; centralized UI enablement checks; guarded UI event posting so events are emitted only when both Spark UI and Gluten UI are enabled. These changes were implemented through targeted commits that refined test APIs for specified Spark versions and improved UI gating mechanisms.
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025 — Apache incubator-gluten: Strengthened testing infrastructure and UI reliability to improve confidence before releases and reduce CI noise. Delivered Spark Version Compatibility Testing Infrastructure by refactoring test APIs to standardize how Spark versions are specified, and updated test macros across backends (ClickHouse, Velox, Delta, Hudi, Iceberg) to improve version compatibility management and testability. Fixed UI Testing Stability and Correctness by stabilizing tests through disabling Spark UI to prevent flakiness in VeloxUdfSuite and GlutenTestsTrait; centralized UI enablement checks; guarded UI event posting so events are emitted only when both Spark UI and Gluten UI are enabled. These changes were implemented through targeted commits that refined test APIs for specified Spark versions and improved UI gating mechanisms.
March 2025
2 Commits • 1 Features
Mar 1, 2025In March 2025, two focused changes were delivered for apache/incubator-gluten to improve memory correctness and code cleanliness, reinforcing stability and future evolvability. Key outcomes include a bug fix in VeloxHashShuffleWriter memory accounting and a targeted cleanup of the LocalPartitionWriter, aligned with the hash/sort eviction strategy.
2 Commits • 1 Features
Mar 1, 2025In March 2025, two focused changes were delivered for apache/incubator-gluten to improve memory correctness and code cleanliness, reinforcing stability and future evolvability. Key outcomes include a bug fix in VeloxHashShuffleWriter memory accounting and a targeted cleanup of the LocalPartitionWriter, aligned with the hash/sort eviction strategy.
March 2025
February 2025
2 Commits • 1 Features
Feb 1, 2025Consolidated backend configuration management and fixed compression alignment across backends this month, delivering maintainability, reliability, and cross-backend consistency for Gluten’s project. The work focused on a backend configuration management refactor and a bug fix to align the native writer’s compression with vanilla Spark when hive.exec.compress.output is enabled, including tests across Spark versions.
February 2025
2 Commits • 1 Features
Feb 1, 2025Consolidated backend configuration management and fixed compression alignment across backends this month, delivering maintainability, reliability, and cross-backend consistency for Gluten’s project. The work focused on a backend configuration management refactor and a bug fix to align the native writer’s compression with vanilla Spark when hive.exec.compress.output is enabled, including tests across Spark versions.
January 2025
6 Commits • 2 Features
Jan 1, 2025January 2025: Delivered core Gluten configuration management overhaul and Hive bucketed write support for the Velox backend targeting Spark 3.4/3.5. The work enhances cross-backend consistency, maintainability, and Spark compatibility, while expanding testing coverage and reducing configuration drift.
6 Commits • 2 Features
Jan 1, 2025January 2025: Delivered core Gluten configuration management overhaul and Hive bucketed write support for the Velox backend targeting Spark 3.4/3.5. The work enhances cross-backend consistency, maintainability, and Spark compatibility, while expanding testing coverage and reducing configuration drift.
January 2025
December 2024
9 Commits • 7 Features
Dec 1, 2024December 2024 — Apache Gluten (apache/incubator-gluten) monthly summary. Focused on governance, reliability, and configurability to accelerate delivery and improve runtime performance across the Gluten project. Key features delivered: - Gluten Project Improvement Proposals (GPIP) governance: Established a formal GPIP process, governance framework, and proposal template to drive major optimizations transparently. Commit: [CORE] Add Gluten Project Improvement Proposals (GPIP) doc (#8133). - CI pipeline enhancement: Upgraded CI matrix to Celeborn 0.5.2, enabling bug fixes and performance improvements in builds. Commit: [CORE] Bump celeborn to 0.5.2 (#8054). - Broadcast join improvements: BuildSideRelation refinements to support all broadcast join scenarios and keys, improving join robustness. Commit: [GLUTEN-8115][CORE] Refine the BuildSideRelation transform to support all scenarios (#8116). - Velox loadQuantum tuning: Adjusted defaults for SSD compatibility and tuned behavior when Velox cache is enabled. Commits: [VL] Change loadQuantum default value to 8MB (#8186); [VL] Change the loadQuantum config if velox cache is enabled (#8197). - Gluten configuration system refactor: Introduced ConfigEntry to centralize configuration definitions and migration paths, improving flexibility and maintainability. Commit: [GLUTEN-8327][CORE] Introduce the ConfigEntry to make the config definition more flexible (#8328). Major bugs fixed: - VCS issue identifier regex: Fixed the regex to capture both '#'-prefixed and 'GLUTEN-' prefixed issues with numeric suffix, enhancing issue tracking and linking. Commit: [INFRA][MINOR] Change the issueRegexp to (?:#|GLUTEN-)(\\d+) from the vcs.xml (#56b8514...). Overall impact and accomplishments: - Strengthened governance and visibility for major optimizations, enabling faster decision-making and clearer change logs. - Improved CI reliability and build performance through dependency updates. - More robust join processing across scenarios, boosting query correctness and performance in production workloads. - Tuned Velox data handling to better leverage cache and SSD storage, reducing latency. - Centralized configuration definitions enabling safer migrations and faster feature rollouts. Technologies/skills demonstrated: - Governance design and process framing (GPIP) - CI/CD optimization and dependency management - Data engineering performance (BuildSideRelation, broadcast joins) - Velox performance tuning and cache-aware behavior - Configuration management and migration planning
December 2024
9 Commits • 7 Features
Dec 1, 2024December 2024 — Apache Gluten (apache/incubator-gluten) monthly summary. Focused on governance, reliability, and configurability to accelerate delivery and improve runtime performance across the Gluten project. Key features delivered: - Gluten Project Improvement Proposals (GPIP) governance: Established a formal GPIP process, governance framework, and proposal template to drive major optimizations transparently. Commit: [CORE] Add Gluten Project Improvement Proposals (GPIP) doc (#8133). - CI pipeline enhancement: Upgraded CI matrix to Celeborn 0.5.2, enabling bug fixes and performance improvements in builds. Commit: [CORE] Bump celeborn to 0.5.2 (#8054). - Broadcast join improvements: BuildSideRelation refinements to support all broadcast join scenarios and keys, improving join robustness. Commit: [GLUTEN-8115][CORE] Refine the BuildSideRelation transform to support all scenarios (#8116). - Velox loadQuantum tuning: Adjusted defaults for SSD compatibility and tuned behavior when Velox cache is enabled. Commits: [VL] Change loadQuantum default value to 8MB (#8186); [VL] Change the loadQuantum config if velox cache is enabled (#8197). - Gluten configuration system refactor: Introduced ConfigEntry to centralize configuration definitions and migration paths, improving flexibility and maintainability. Commit: [GLUTEN-8327][CORE] Introduce the ConfigEntry to make the config definition more flexible (#8328). Major bugs fixed: - VCS issue identifier regex: Fixed the regex to capture both '#'-prefixed and 'GLUTEN-' prefixed issues with numeric suffix, enhancing issue tracking and linking. Commit: [INFRA][MINOR] Change the issueRegexp to (?:#|GLUTEN-)(\\d+) from the vcs.xml (#56b8514...). Overall impact and accomplishments: - Strengthened governance and visibility for major optimizations, enabling faster decision-making and clearer change logs. - Improved CI reliability and build performance through dependency updates. - More robust join processing across scenarios, boosting query correctness and performance in production workloads. - Tuned Velox data handling to better leverage cache and SSD storage, reducing latency. - Centralized configuration definitions enabling safer migrations and faster feature rollouts. Technologies/skills demonstrated: - Governance design and process framing (GPIP) - CI/CD optimization and dependency management - Data engineering performance (BuildSideRelation, broadcast joins) - Velox performance tuning and cache-aware behavior - Configuration management and migration planning
November 2024
6 Commits • 2 Features
Nov 1, 2024Nov 2024 monthly summary for apache/incubator-gluten focused on delivering end-to-end Hive/Parquet interoperability, improving query planning efficiency, and maintaining repository hygiene. Key outcomes include enabling native writer support for CreateHiveTableAsSelectCommand in the Velox backend with tests and updated GlutenWriterColumnarRules to ensure correct output formats for Hive tables created via SELECT with Parquet storage. Introduced and applied a two-phase hash base aggregate optimization to merge two consecutive complete-mode aggregates, reducing plan depth and execution overhead. Hardened attribute binding for projections by adding a robust fallback to name-based matching when exprId lookup fails. Maintenance improvement: added metastore_db/ to .gitignore to prevent local metastore database files from being tracked in the repository. These contributions improve business value by enabling reliable Hive/Parquet workflows, reducing execution steps in common aggregation patterns, improving planner reliability, and maintaining a cleaner codebase.
6 Commits • 2 Features
Nov 1, 2024Nov 2024 monthly summary for apache/incubator-gluten focused on delivering end-to-end Hive/Parquet interoperability, improving query planning efficiency, and maintaining repository hygiene. Key outcomes include enabling native writer support for CreateHiveTableAsSelectCommand in the Velox backend with tests and updated GlutenWriterColumnarRules to ensure correct output formats for Hive tables created via SELECT with Parquet storage. Introduced and applied a two-phase hash base aggregate optimization to merge two consecutive complete-mode aggregates, reducing plan depth and execution overhead. Hardened attribute binding for projections by adding a robust fallback to name-based matching when exprId lookup fails. Maintenance improvement: added metastore_db/ to .gitignore to prevent local metastore database files from being tracked in the repository. These contributions improve business value by enabling reliable Hive/Parquet workflows, reducing execution steps in common aggregation patterns, improving planner reliability, and maintaining a cleaner codebase.
November 2024
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 | Focused on expanding join capabilities and code quality in the gluten project. Delivered multi-key join support for the ColumnarBuildSideRelation by refactoring key extraction and projection logic, with targeted tests to validate joins with multiple conditions.
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 | Focused on expanding join capabilities and code quality in the gluten project. Delivered multi-key join support for the ColumnarBuildSideRelation by refactoring key extraction and projection logic, with targeted tests to validate joins with multiple conditions.
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Quality Metrics
Correctness91.0%
Maintainability90.0%
Architecture88.6%
Performance75.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++Git ConfigurationJavaMarkdownScalaShellXMLYAML
Technical Skills
Aggregate FunctionsBackend DevelopmentBig DataBuild AutomationC++CI/CDCode OrganizationCode RefactoringCode StandardizationCompressionConfigurationConfiguration ManagementData EngineeringData PartitioningData Processing
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