apache/hadoop
Dec 2024 – May 2025
3 Months active
Languages Used
Java
Technical Skills
Backend DevelopmentDistributed SystemsJavaYARNConcurrencyPerformance Optimization
Tao Yang
PROFILE
Tao Yang
Worked on apache/hadoop to enhance the reliability and performance of YARN’s ResourceManager and scheduler components. Delivered an uncaught exception handler for asynchronous scheduling threads, preventing scheduler hangs and improving fault tolerance. Addressed concurrency issues by replacing non-thread-safe data structures with ConcurrentHashMap in the metrics cache, and optimized scheduler pre-check logic to reduce redundant node checks, accelerating scheduling cycles. Focused on Java-based backend development, distributed systems, and resource management, with extensive use of unit and concurrency testing. Also stabilized CapacityScheduler tests by improving test utilities, reducing flakiness in CI without altering production code, and ensuring more reliable release cycles.
Overall Statistics
Feature vs Bugs
25%Features
Repository Contributions
4Total
Bugs
3
Commits
4
Features
1
Lines of code
405
Activity Months3
Your Network
807 peopleSame Organization
@apache.org714
a.huberMember
Akira AjisakaMember
Andrzej BiałeckiMember
Arturo BernalMember
Abhishek KumarMember
Attila BukorMember
VampireAchaoMember
Abhishek ChennakaMember
Andreas DangelMember
Shared Repositories
93
Work History
May 2025
1 Commits
May 1, 2025May 2025 monthly summary for apache/hadoop: Focused on stabilizing tests for the CapacityScheduler and preserving core logic. Implemented a test-only stability improvement that significantly reduces flaky failures in multi-node scenarios without touching production code.
1 Commits
May 1, 2025May 2025 monthly summary for apache/hadoop: Focused on stabilizing tests for the CapacityScheduler and preserving core logic. Implemented a test-only stability improvement that significantly reduces flaky failures in multi-node scenarios without touching production code.
May 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for apache/hadoop focusing on reliability improvements and performance optimization in YARN. Delivered two critical items supported by added tests and measurable performance impact.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for apache/hadoop focusing on reliability improvements and performance optimization in YARN. Delivered two critical items supported by added tests and measurable performance impact.
December 2024
1 Commits
Dec 1, 2024December 2024 (apache/hadoop): Focused reliability hardening for YARN ResourceManager. Delivered an uncaught exception handler for asynchronous scheduling threads to prevent scheduler hangs, ensuring continuous RM operation under fault conditions. Added tests validating behavior during RM failover and simulated exceptions to strengthen resilience across failover events and error scenarios. Commit aa5fe6f550c8971762c02c292240a7529001e1d8 (YARN-10058) included as the primary contribution.
1 Commits
Dec 1, 2024December 2024 (apache/hadoop): Focused reliability hardening for YARN ResourceManager. Delivered an uncaught exception handler for asynchronous scheduling threads to prevent scheduler hangs, ensuring continuous RM operation under fault conditions. Added tests validating behavior during RM failover and simulated exceptions to strengthen resilience across failover events and error scenarios. Commit aa5fe6f550c8971762c02c292240a7529001e1d8 (YARN-10058) included as the primary contribution.
December 2024
Activity
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Quality Metrics
Correctness95.0%
Maintainability90.0%
Architecture85.0%
Performance90.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Java
Technical Skills
Backend DevelopmentConcurrencyDistributed SystemsJavaPerformance OptimizationResource ManagementScheduler DesignTestingUnit TestingYARN
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline