apache/zeppelin
Nov 2024 – Oct 2025
6 Months active
Languages Used
HTMLJavaLessTypeScriptXMLMarkdownShellCSS
Technical Skills
AngularBackend DevelopmentBug FixingBuild AutomationFront End DevelopmentJava
ChanHo Lee
PROFILE
Chanho Lee
Chanho Lee contributed to the apache/zeppelin repository by delivering features and fixes that improved reliability, security, and maintainability across both frontend and backend systems. He implemented secure WebSocket origin validation and explicit port configuration for containerized deployments, using Java and Maven to enhance server-side robustness. On the frontend, he upgraded Angular versions, enforced strict TypeScript type safety, and improved UI discoverability through configuration sorting. His work included stabilizing browser automation with Selenium and GitHub Actions, as well as hardening notebook path validation. Chanho’s engineering demonstrated depth in configuration management, build automation, and cross-stack integration, resulting in more predictable and maintainable releases.
Overall Statistics
Feature vs Bugs
69%Features
Repository Contributions
13Total
Bugs
4
Commits
13
Features
9
Lines of code
46,072
Activity Months6
Your Network
20 people
Work History
October 2025
2 Commits • 1 Features
Oct 1, 2025October 2025 (month: 2025-10) highlights two high-impact deliveries for apache/zeppelin. 1) Windows CI migrated from AppVeyor to GitHub Actions, removing legacy AppVeyor configuration and introducing a Windows GitHub Actions workflow to streamline builds and testing, improving reliability and feedback速度. 2) Frontend Selenium tests stabilized by switching from Firefox to Microsoft Edge, updating GitHub Actions workflow and WebDriverManager to support Edge, reducing flakiness and aligning tests with supported browser options. These efforts shorten feedback loops, improve CI stability, and reduce maintenance burden. Commit references: 25ec6ed966db56ea04d995d16b77fb553665dd26 (ZEPPELIN-6353) and 3d1ee7c6bfeb178d853e8f67af97f0c2b326da96 (ZEPPELIN-6350).
2 Commits • 1 Features
Oct 1, 2025October 2025 (month: 2025-10) highlights two high-impact deliveries for apache/zeppelin. 1) Windows CI migrated from AppVeyor to GitHub Actions, removing legacy AppVeyor configuration and introducing a Windows GitHub Actions workflow to streamline builds and testing, improving reliability and feedback速度. 2) Frontend Selenium tests stabilized by switching from Firefox to Microsoft Edge, updating GitHub Actions workflow and WebDriverManager to support Edge, reducing flakiness and aligning tests with supported browser options. These efforts shorten feedback loops, improve CI stability, and reduce maintenance burden. Commit references: 25ec6ed966db56ea04d995d16b77fb553665dd26 (ZEPPELIN-6353) and 3d1ee7c6bfeb178d853e8f67af97f0c2b326da96 (ZEPPELIN-6350).
October 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for apache/zeppelin focusing on front-end quality and type safety improvements. Delivered a targeted TypeScript configuration change to enable strict mode, reinforcing safer coding practices without altering existing runtime behavior.
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for apache/zeppelin focusing on front-end quality and type safety improvements. Delivered a targeted TypeScript configuration change to enable strict mode, reinforcing safer coding practices without altering existing runtime behavior.
July 2025
3 Commits • 3 Features
Jul 1, 20252025-07 Monthly Summary for apache/zeppelin: Delivered three major items that drive user experience, reliability, and maintainability. Key features delivered include UI configuration discovery improvements, a framework upgrade to keep the UI aligned with modern tooling, and a startup reliability enhancement to prevent partial initialization. Specifically, Alphabetical Sorting of Configuration Entries in the new UI improves discoverability and consistency; zeppelin-web-angular was upgraded from Angular 8 to 9 to enable modern tooling and future UI enhancements; and a fail-fast mechanism was implemented for missing resources during default web app context initialization to reduce downstream failures. These changes reduce user friction, lower incident risk, and set up the UI for future enhancements. Technologies and skills demonstrated include frontend Angular upgrade practices, UI/UX quality improvements, and robust startup/error-handling patterns.
3 Commits • 3 Features
Jul 1, 20252025-07 Monthly Summary for apache/zeppelin: Delivered three major items that drive user experience, reliability, and maintainability. Key features delivered include UI configuration discovery improvements, a framework upgrade to keep the UI aligned with modern tooling, and a startup reliability enhancement to prevent partial initialization. Specifically, Alphabetical Sorting of Configuration Entries in the new UI improves discoverability and consistency; zeppelin-web-angular was upgraded from Angular 8 to 9 to enable modern tooling and future UI enhancements; and a fail-fast mechanism was implemented for missing resources during default web app context initialization to reduce downstream failures. These changes reduce user friction, lower incident risk, and set up the UI for future enhancements. Technologies and skills demonstrated include frontend Angular upgrade practices, UI/UX quality improvements, and robust startup/error-handling patterns.
July 2025
June 2025
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for apache/zeppelin focusing on key accomplishments and business impact. Delivered targeted features to improve reliability and security, fixed critical navigation issues, and strengthened testing coverage. The work reduced dependency risks, improved user experience, and demonstrated strong frontend/backend integration and code hygiene.
June 2025
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for apache/zeppelin focusing on key accomplishments and business impact. Delivered targeted features to improve reliability and security, fixed critical navigation issues, and strengthened testing coverage. The work reduced dependency risks, improved user experience, and demonstrated strong frontend/backend integration and code hygiene.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024: Delivered explicit port configuration for Zeppelin Interpreter Event Server (ZEPPELIN_SERVER_RPC_PORT) to give precise port control in containerized deployments. This option takes precedence over the existing port-range setting, improving predictability and reducing port conflicts. Related commit: f3551eb3a8a0141a670809a994f050baced3ac66 (ZEPPELIN-6143). No major bugs fixed this month. Impact: more reliable deployments, better resource isolation, and smoother scaling in containerized environments. Technologies demonstrated: configuration management, container-friendly deployment, Java-based backend changes, and change traceability.
1 Commits • 1 Features
Dec 1, 2024December 2024: Delivered explicit port configuration for Zeppelin Interpreter Event Server (ZEPPELIN_SERVER_RPC_PORT) to give precise port control in containerized deployments. This option takes precedence over the existing port-range setting, improving predictability and reducing port conflicts. Related commit: f3551eb3a8a0141a670809a994f050baced3ac66 (ZEPPELIN-6143). No major bugs fixed this month. Impact: more reliable deployments, better resource isolation, and smoother scaling in containerized environments. Technologies demonstrated: configuration management, container-friendly deployment, Java-based backend changes, and change traceability.
December 2024
November 2024
3 Commits • 2 Features
Nov 1, 2024Monthly summary for 2024-11 focusing on Apache Zeppelin contributions. Delivered security hardening, build reliability, and dependency simplification. Key outcomes include securing the WebSocket handshake for the Terminal Interpreter, cleaning up the build to remove Spark and Flink interpreter files, and removing an AngularJS-to-Angular migration feature to simplify dependencies and support future updates.
November 2024
3 Commits • 2 Features
Nov 1, 2024Monthly summary for 2024-11 focusing on Apache Zeppelin contributions. Delivered security hardening, build reliability, and dependency simplification. Key outcomes include securing the WebSocket handshake for the Terminal Interpreter, cleaning up the build to remove Spark and Flink interpreter files, and removing an AngularJS-to-Angular migration feature to simplify dependencies and support future updates.
Activity
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Quality Metrics
Correctness94.6%
Maintainability90.0%
Architecture89.2%
Performance84.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
BashCSSHTMLJavaJavaScriptLessMarkdownShellTypeScriptXML
Technical Skills
AngularBackend DevelopmentBrowser AutomationBug FixBug FixingBuild AutomationCI/CDCode RefactoringComponent DevelopmentConfiguration ManagementDependency ManagementDevOpsDocumentationError HandlingFront End Development
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