apache/zeppelin
Aug 2025 – Mar 2026
6 Months active
Languages Used
INIPythonCSSHTMLJSONJavaJavaScriptLess
Technical Skills
Configuration ManagementDependency ManagementScriptingAngularAngularJSBackend Development
ChanHo Lee
PROFILE
Chanho Lee
Over six months, contributed to the apache/zeppelin repository by building and stabilizing both frontend and backend features, with a focus on maintainability and reliability. Delivered enhancements such as automatic WebSocket reconnection in the Angular UI, unified keyboard handling across Angular and Monaco editors, and modular Node/NPM version management. Addressed critical bugs affecting Windows compatibility and CI/CD reliability, while improving integration testing with Java and Selenium. Applied configuration management and dependency pinning to streamline onboarding and ensure reproducible environments. The work emphasized robust exception handling, type safety in TypeScript, and smoother development workflows, resulting in a more resilient and maintainable codebase.
Overall Statistics
Feature vs Bugs
57%Features
Repository Contributions
15Total
Bugs
6
Commits
15
Features
8
Lines of code
16,176
Activity Months6
Your Network
705 peopleSame Organization
@apache.org683
a.huberMember
Akira AjisakaMember
Andrzej BiałeckiMember
Arturo BernalMember
Abhishek KumarMember
Attila BukorMember
VampireAchaoMember
Abhishek ChennakaMember
Andreas DangelMember
Work History
March 2026
1 Commits
Mar 1, 2026March 2026: Stability and reliability improvements for the Zeppelin interpreter test workflow in apache/zeppelin. The primary focus was reducing CI flakiness in the interpreter-test-non-core job by updating Testcontainers to address Docker Engine API compatibility.
1 Commits
Mar 1, 2026March 2026: Stability and reliability improvements for the Zeppelin interpreter test workflow in apache/zeppelin. The primary focus was reducing CI flakiness in the interpreter-test-non-core job by updating Testcontainers to address Docker Engine API compatibility.
March 2026
February 2026
1 Commits
Feb 1, 2026February 2026 monthly summary for apache/zeppelin: Stabilized Selenium-based integration tests to improve CI reliability and reduce flaky failures. This work is captured in commit 776e29c89f4e1d47a89bd09c9a467acb0dce3767 addressing ZEPPELIN-6398. Key improvements include driver window handling with fixed size, separation of wait intents, and disabling blocking browser features. Result: more robust test suite and faster feedback on Spark module integrations.
February 2026
1 Commits
Feb 1, 2026February 2026 monthly summary for apache/zeppelin: Stabilized Selenium-based integration tests to improve CI reliability and reduce flaky failures. This work is captured in commit 776e29c89f4e1d47a89bd09c9a467acb0dce3767 addressing ZEPPELIN-6398. Key improvements include driver window handling with fixed size, separation of wait intents, and disabling blocking browser features. Result: more robust test suite and faster feedback on Spark module integrations.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025: Delivered automatic WebSocket reconnection for the Angular UI in Apache Zeppelin, ensuring real-time updates remain available after abnormal closures and eliminating the need for manual refreshes. This aligns the new UI behavior with the legacy UI, improving resilience in fluctuating networks and preserving notebook workflow continuity.
1 Commits • 1 Features
Nov 1, 2025November 2025: Delivered automatic WebSocket reconnection for the Angular UI in Apache Zeppelin, ensuring real-time updates remain available after abnormal closures and eliminating the need for manual refreshes. This aligns the new UI behavior with the legacy UI, improving resilience in fluctuating networks and preserving notebook workflow continuity.
November 2025
October 2025
5 Commits • 2 Features
Oct 1, 2025October 2025 focused on stability, reliability, and maintainability for the Zeppelin frontend. Delivered four targeted changes spanning bug fixes and new capabilities, with emphasis on safer code, cohesive editor behavior, and CI/CD policy compliance. The work reduced runtime errors, stabilized user workflows, and improved test reliability, while ensuring compliance and easier future maintenance.
October 2025
5 Commits • 2 Features
Oct 1, 2025October 2025 focused on stability, reliability, and maintainability for the Zeppelin frontend. Delivered four targeted changes spanning bug fixes and new capabilities, with emphasis on safer code, cohesive editor behavior, and CI/CD policy compliance. The work reduced runtime errors, stabilized user workflows, and improved test reliability, while ensuring compliance and easier future maintenance.
September 2025
6 Commits • 4 Features
Sep 1, 2025For 2025-09, the Zeppelin frontend stream focused on stabilizing the UI, strengthening type-safety, and enabling modular frontend tooling, while addressing critical path bugs that affected Windows usability and runtime reliability. This release smooths development workflows, reduces maintenance burden, and improves business value through more robust UI behavior and faster issue detection.
6 Commits • 4 Features
Sep 1, 2025For 2025-09, the Zeppelin frontend stream focused on stabilizing the UI, strengthening type-safety, and enabling modular frontend tooling, while addressing critical path bugs that affected Windows usability and runtime reliability. This release smooths development workflows, reduces maintenance burden, and improves business value through more robust UI behavior and faster issue detection.
September 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025In August 2025, Zeppelin development focused on strengthening environment management and dependency reproducibility for the merge_zeppelin_pr.py workflow, enabling more predictable local and CI runs and smoother onboarding for new contributors. The change set centers on adding environment variable support and pinning dependencies, with clear documentation updates.
August 2025
1 Commits • 1 Features
Aug 1, 2025In August 2025, Zeppelin development focused on strengthening environment management and dependency reproducibility for the merge_zeppelin_pr.py workflow, enabling more predictable local and CI runs and smoother onboarding for new contributors. The change set centers on adding environment variable support and pinning dependencies, with clear documentation updates.
Activity
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Quality Metrics
Correctness94.0%
Maintainability86.0%
Architecture86.6%
Performance83.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
CSSHTMLINIJSONJavaJavaScriptLessPythonShellTypeScript
Technical Skills
API DevelopmentAngularAngularJSBackend DevelopmentBug FixBug FixingBuild System ConfigurationCI/CDConfiguration ManagementDependency ManagementDevOpsException HandlingFront End DevelopmentFrontend DevelopmentHTML
Repositories Contributed To
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