apache/impala
Dec 2024 – Aug 2025
7 Months active
Languages Used
C++CSSHTMLJavaScriptPythonJSONShell
Technical Skills
C++CSSData AnalysisDataTablesFrontend DevelopmentHTML
Surya Hebbar
PROFILE
Surya Hebbar
Siddharth Hebbar contributed to the apache/impala repository by developing and refining features that improved web UI performance, data profiling, and system reliability. He enhanced observability and diagnostics by implementing row grouping and histogram-based skew analysis in the UI, and optimized JSON handling using C++ and JavaScript. Siddharth addressed concurrency and memory management issues in the webserver, introducing mutex-based synchronization to resolve data races. He expanded compression algorithm support and standardized frontend code quality with ESLint and linting practices. His work demonstrated depth in backend and frontend development, focusing on maintainability, testability, and robust performance under concurrent workloads.
Overall Statistics
Feature vs Bugs
62%Features
Repository Contributions
15Total
Bugs
5
Commits
15
Features
8
Lines of code
5,174
Activity Months7
Your Network
121 people
Work History
August 2025
1 Commits
Aug 1, 2025August 2025 monthly summary for apache/impala. Focus area: Webserver stability under concurrent workloads. Key accomplishment: fixed a MemTracker data race in the Webserver by introducing a shared mutex to guard access to the compressed buffer memory tracker, addressing TSAN build failures and enhancing runtime reliability. This work maps to IMPALA-14278 and was committed as 09a6f0e6cd912f573f0d8950abf40f498385c628. Impact: more stable Webserver component under load, fewer memory-tracking related incidents, smoother CI builds. Technologies/skills demonstrated: concurrency control (mutex), memory tracking, TSAN debugging, C++ multi-threading, review-ready change management.
1 Commits
Aug 1, 2025August 2025 monthly summary for apache/impala. Focus area: Webserver stability under concurrent workloads. Key accomplishment: fixed a MemTracker data race in the Webserver by introducing a shared mutex to guard access to the compressed buffer memory tracker, addressing TSAN build failures and enhancing runtime reliability. This work maps to IMPALA-14278 and was committed as 09a6f0e6cd912f573f0d8950abf40f498385c628. Impact: more stable Webserver component under load, fewer memory-tracking related incidents, smoother CI builds. Technologies/skills demonstrated: concurrency control (mutex), memory tracking, TSAN debugging, C++ multi-threading, review-ready change management.
August 2025
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for Apache Impala development focused on UI quality improvements and test infrastructure modernization. Key work included user-visible enhancements to the WebUI Imported Query Profiles view and the standardization of WebUI JavaScript test naming, both of which improve usability and maintainability. These changes reduce ambiguity in profiling data, streamline test failure analysis, and align with project-wide quality standards. Key outcomes: (1) imported query profiles display improvements (correct nanosecond time rendering, fixed navbar, and removal of extraneous Coordin ator/Executor Slots columns); (2) WebUI JavaScript tests naming standardized to webui.js_tests.<module>.<function>.<description> for better organization and reliable JUnit XML reporting.
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for Apache Impala development focused on UI quality improvements and test infrastructure modernization. Key work included user-visible enhancements to the WebUI Imported Query Profiles view and the standardization of WebUI JavaScript test naming, both of which improve usability and maintainability. These changes reduce ambiguity in profiling data, streamline test failure analysis, and align with project-wide quality standards. Key outcomes: (1) imported query profiles display improvements (correct nanosecond time rendering, fixed navbar, and removal of extraneous Coordin ator/Executor Slots columns); (2) WebUI JavaScript tests naming standardized to webui.js_tests.<module>.<function>.<description> for better organization and reliable JUnit XML reporting.
May 2025
3 Commits • 1 Features
May 1, 2025May 2025 (2025-05) summary: Delivered reliability and maintainability improvements to the Apache Impala web UI and data visualization. Key features delivered include frontend linting and coding standard updates for large JavaScript files to improve maintainability; major bugs fixed include stabilizing the query timeline visualization after the web UI refactor and clarifying missing event timestamps in JSON profiles. Overall impact: restored accurate query execution details, improved visualization alignment, and stronger code quality across the web UI; technologies demonstrated include JavaScript linting, UI data visualization, and robust handling of event data.
3 Commits • 1 Features
May 1, 2025May 2025 (2025-05) summary: Delivered reliability and maintainability improvements to the Apache Impala web UI and data visualization. Key features delivered include frontend linting and coding standard updates for large JavaScript files to improve maintainability; major bugs fixed include stabilizing the query timeline visualization after the web UI refactor and clarifying missing event timestamps in JSON profiles. Overall impact: restored accurate query execution details, improved visualization alignment, and stronger code quality across the web UI; technologies demonstrated include JavaScript linting, UI data visualization, and robust handling of event data.
May 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for apache/impala focusing on business value and technical achievements. Delivered expanded compression level support for ZLIB, ZSTD, and BZIP2 in Impala, enabling finer control over data encoding and storage efficiency. The change refactors CodecInfo to use std::optional for compression levels, adds extended options for ZLIB, ZSTD, and BZIP2 codecs, and includes new tests and validation methods to prevent misconfiguration. This work is tied to IMPALA-13923 and the commit below, contributing to better performance, storage flexibility, and safer defaults.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for apache/impala focusing on business value and technical achievements. Delivered expanded compression level support for ZLIB, ZSTD, and BZIP2 in Impala, enabling finer control over data encoding and storage efficiency. The change refactors CodecInfo to use std::optional for compression levels, adds extended options for ZLIB, ZSTD, and BZIP2 codecs, and includes new tests and validation methods to prevent misconfiguration. This work is tied to IMPALA-13923 and the commit below, contributing to better performance, storage flexibility, and safer defaults.
March 2025
3 Commits • 3 Features
Mar 1, 2025March 2025 monthly summary for apache/impala development work focusing on delivering user-facing improvements, performance optimizations, and code quality tooling in the Web UI and JSON handling.
3 Commits • 3 Features
Mar 1, 2025March 2025 monthly summary for apache/impala development work focusing on delivering user-facing improvements, performance optimizations, and code quality tooling in the Web UI and JSON handling.
March 2025
February 2025
3 Commits
Feb 1, 2025February 2025: Focused on stabilizing the Apache Impala runtime-profile-test. Delivered reliability improvements, corrected flakiness, and aligned test observability with current JSON profile outputs. Implemented test fixture refactor, added retries for setup, and resolved TSAN build failures by updating event sequencing to pass values by reference. These efforts improved CI stability, reduced false positives, and provided a more maintainable test suite.
February 2025
3 Commits
Feb 1, 2025February 2025: Focused on stabilizing the Apache Impala runtime-profile-test. Delivered reliability improvements, corrected flakiness, and aligned test observability with current JSON profile outputs. Implemented test fixture refactor, added retries for setup, and resolved TSAN build failures by updating event sequencing to pass values by reference. These efforts improved CI stability, reduced false positives, and provided a more maintainable test suite.
December 2024
2 Commits • 2 Features
Dec 1, 2024December 2024: Delivered significant UI and profiling enhancements on apache/impala to boost observability and performance diagnostics. Implemented row grouping on the Fragment Instances page using DataTables RowGroup with an updated DataTables library and licensing, enabling faster fragmentation-level analysis. Enhanced runtime profiles readability and skew analysis: added a concise textual representation for aggregate event sequences, streamlined timestamp display, and introduced histogram-based skew summaries in profile V2. No major bugs fixed this month. These changes reduce time-to-insight for performance engineers and improve data-driven decision making for cluster tuning.
2 Commits • 2 Features
Dec 1, 2024December 2024: Delivered significant UI and profiling enhancements on apache/impala to boost observability and performance diagnostics. Implemented row grouping on the Fragment Instances page using DataTables RowGroup with an updated DataTables library and licensing, enabling faster fragmentation-level analysis. Enhanced runtime profiles readability and skew analysis: added a concise textual representation for aggregate event sequences, streamlined timestamp display, and introduced histogram-based skew summaries in profile V2. No major bugs fixed this month. These changes reduce time-to-insight for performance engineers and improve data-driven decision making for cluster tuning.
December 2024
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Quality Metrics
Correctness92.0%
Maintainability88.0%
Architecture81.4%
Performance78.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++CSSHTMLJSONJavaScriptPythonShell
Technical Skills
Backend DevelopmentBuild SystemsC++C++ DevelopmentCI/CDCSSCode AnalysisCode QualityCompression AlgorithmsConcurrencyData AnalysisData ProfilingDataTablesDebuggingFrontend Development
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