apache/doris
Nov 2024 – Mar 2025
4 Months active
Languages Used
GroovyJavaANTLR
Technical Skills
Backend DevelopmentDatabase OptimizationMaterialized ViewsQuery RewritingTestingData Backup and Recovery
zhangyuan
PROFILE
Zhangyuan
Over four months, contributed to apache/doris by building and refining core backend features and stability improvements. Developed a global system configuration backup and restore capability, introducing new SQL syntax and backend logic to enhance disaster recovery and governance. Improved materialized view rewrite correctness and implemented backup/restore enhancements for colocated tables, ensuring data integrity and reliable group associations. Addressed bugs in Hive integration, CHDFS cache host resolution, and test flakiness, using Java, Groovy, and ANTLR for robust system design and testing. The work emphasized database optimization, distributed systems, and configuration management, resulting in greater reliability and maintainability for Doris deployments.
Overall Statistics
Feature vs Bugs
29%Features
Repository Contributions
7Total
Bugs
5
Commits
7
Features
2
Lines of code
2,981
Activity Months4
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Work History
March 2025
3 Commits
Mar 1, 2025March 2025: Focused on stability and correctness in Hive integration, restore workflows, and CHDFS caching. Key outcomes include fixes to Hive Metastore client socket timeout, correct colocate handling during restores with new tests, and CHDFS cache host resolution to prevent cross-instance hash collisions. These changes reduce Metastore errors, ensure backend assignment consistency, and improve multi-tenant cache reliability, contributing to system stability and scalability. Technologies demonstrated include HiveConf timeout management, backup/restore workflows, CHDFS URI parsing, and test-driven development.
3 Commits
Mar 1, 2025March 2025: Focused on stability and correctness in Hive integration, restore workflows, and CHDFS caching. Key outcomes include fixes to Hive Metastore client socket timeout, correct colocate handling during restores with new tests, and CHDFS cache host resolution to prevent cross-instance hash collisions. These changes reduce Metastore errors, ensure backend assignment consistency, and improve multi-tenant cache reliability, contributing to system stability and scalability. Technologies demonstrated include HiveConf timeout management, backup/restore workflows, CHDFS URI parsing, and test-driven development.
March 2025
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025: Delivered backup/restore enhancements for colocated tables and stabilized the test suite in apache/doris, reinforcing data integrity and CI reliability. Implemented 'reserve_colocate' restore property to preserve colocate table group associations during backup/restore, and fixed test flakiness by ensuring unique repository name via UUID per test run.
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025: Delivered backup/restore enhancements for colocated tables and stabilized the test suite in apache/doris, reinforcing data integrity and CI reliability. Implemented 'reserve_colocate' restore property to preserve colocate table group associations during backup/restore, and fixed test flakiness by ensuring unique repository name via UUID per test run.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 (2024-12): Delivered the Global System Configuration Backup and Restore feature for Apache Doris, enabling backup and restoration of global objects such as user privileges, catalogs, and workload groups. This included new SQL syntax and backend logic to manage global configurations, substantially improving disaster recovery capabilities and data governance. No major bugs reported this month; effort focused on feature delivery and DR readiness. Overall impact includes enhanced system resilience, faster DR testing, and stronger governance across global configurations. Technologies/skills demonstrated include SQL syntax design, backend development for global config management, and distributed backup/restore workflows.
1 Commits • 1 Features
Dec 1, 2024December 2024 (2024-12): Delivered the Global System Configuration Backup and Restore feature for Apache Doris, enabling backup and restoration of global objects such as user privileges, catalogs, and workload groups. This included new SQL syntax and backend logic to manage global configurations, substantially improving disaster recovery capabilities and data governance. No major bugs reported this month; effort focused on feature delivery and DR readiness. Overall impact includes enhanced system resilience, faster DR testing, and stronger governance across global configurations. Technologies/skills demonstrated include SQL syntax design, backend development for global config management, and distributed backup/restore workflows.
December 2024
November 2024
1 Commits
Nov 1, 2024November 2024: Focused on hardening materialized view (MV) rewrites in Apache Doris. Implemented a correctness fix for aggregate-table rewrites involving synchronous MVs, ensuring all key columns are evaluated during rewrites instead of only key size. This eliminates incorrect results and improves MV reliability in production. The change was committed as 24e34d3d021c642e9ef2d6dddc937a89c021a5dd with message '[fix](sync mv) fix rewrite wrongly with sync mv (#39284)'.
November 2024
1 Commits
Nov 1, 2024November 2024: Focused on hardening materialized view (MV) rewrites in Apache Doris. Implemented a correctness fix for aggregate-table rewrites involving synchronous MVs, ensuring all key columns are evaluated during rewrites instead of only key size. This eliminates incorrect results and improves MV reliability in production. The change was committed as 24e34d3d021c642e9ef2d6dddc937a89c021a5dd with message '[fix](sync mv) fix rewrite wrongly with sync mv (#39284)'.
Activity
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Quality Metrics
Correctness88.6%
Maintainability85.6%
Architecture81.4%
Performance72.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
ANTLRGroovyJava
Technical Skills
Backend DevelopmentBackup and RestoreBug FixBug FixingConfiguration ManagementData Backup and RecoveryDatabase AdministrationDatabase ManagementDatabase OptimizationDistributed SystemsDorisFile System CacheHDFSHiveMaterialized Views
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline