percona/percona-server
Oct 2024 – Aug 2025
4 Months active
Languages Used
SQLShellC++
Technical Skills
Database TestingDebuggingGTIDPerformance SchemaReplicationSQL Query Optimization
Dmitry Lenev
PROFILE
Dmitry Lenev
Over four months, contributed to percona/percona-server by delivering a new authentication monitoring feature and resolving multiple critical bugs. Developed a Performance Schema table to expose failed login tracking and account lock states, enhancing security observability. Addressed memory leaks and improved test reliability by refining threadpool cleanup and normalizing event scheduler states, using C++, SQL, and shell scripting. Fixed a data loss issue in InnoDB online ALTER TABLE by updating cursor logic for concurrent page merges and adding regression tests. Focused on database internals, concurrency control, and test automation, these efforts improved data integrity, reliability, and release readiness across production environments.
Overall Statistics
Feature vs Bugs
20%Features
Repository Contributions
7Total
Bugs
4
Commits
7
Features
1
Lines of code
2,484
Activity Months4
Your Network
157 peopleShared Repositories
88
Aditya AMember
aibek.bukabayev aibek.bukabayev@percona.comMember
Aibek BukabayevMember
Ajo RobertMember
Alex BudovskiMember
Andrzej JarzabekMember
Andrzej ReligaMember
Annamalai GurusamiMember
Arpit GoswamiMember
Work History
August 2025
1 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08 focusing on security observability enhancements in Percona Server (percona-server). The primary delivery was a new performance_schema feature to improve authentication monitoring and incident response capabilities.
1 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08 focusing on security observability enhancements in Percona Server (percona-server). The primary delivery was a new performance_schema feature to improve authentication monitoring and incident response capabilities.
August 2025
April 2025
1 Commits
Apr 1, 2025April 2025 monthly summary for percona/percona-server: Delivered a critical bug fix to InnoDB online ALTER TABLE that prevents data loss during concurrent page merges, enhanced online rebuild correctness, and expanded regression coverage. This work strengthens data integrity during online DDL and reduces production risk, aligned with upstream PS-9703 and 8.0.41 fixes.
April 2025
1 Commits
Apr 1, 2025April 2025 monthly summary for percona/percona-server: Delivered a critical bug fix to InnoDB online ALTER TABLE that prevents data loss during concurrent page merges, enhanced online rebuild correctness, and expanded regression coverage. This work strengthens data integrity during online DDL and reduces production risk, aligned with upstream PS-9703 and 8.0.41 fixes.
November 2024
2 Commits
Nov 1, 2024November 2024 monthly summary for percona/percona-server focusing on reliability and test stability improvements. Delivered two critical reliability fixes addressing memory management and test flakiness, linked to PS-9470 code refresh for PS 8.4.3 and post-merge MTR fixes. Key results: - Resolved a memory leak in the threadpool connection handler by ensuring VIO and NET objects are released via THD destructor cleanup and by marking VIO inactive to preserve error reporting in out-of-memory scenarios. - Stabilized MySQL test suite by normalizing the event scheduler thread process list state, replacing 'Waiting for next activation' with 'Waiting on empty queue' to ensure consistent results after event deletions. - Strengthened CI/test hygiene and sanitizer compatibility through targeted code refresh aligned with PS-9470 for PS 8.4.3. - Overall impact includes reduced memory-related outages, preserved error-reporting paths, and more predictable test outcomes, enabling faster issue diagnosis and safer deployments.
2 Commits
Nov 1, 2024November 2024 monthly summary for percona/percona-server focusing on reliability and test stability improvements. Delivered two critical reliability fixes addressing memory management and test flakiness, linked to PS-9470 code refresh for PS 8.4.3 and post-merge MTR fixes. Key results: - Resolved a memory leak in the threadpool connection handler by ensuring VIO and NET objects are released via THD destructor cleanup and by marking VIO inactive to preserve error reporting in out-of-memory scenarios. - Stabilized MySQL test suite by normalizing the event scheduler thread process list state, replacing 'Waiting for next activation' with 'Waiting on empty queue' to ensure consistent results after event deletions. - Strengthened CI/test hygiene and sanitizer compatibility through targeted code refresh aligned with PS-9470 for PS 8.4.3. - Overall impact includes reduced memory-related outages, preserved error-reporting paths, and more predictable test outcomes, enabling faster issue diagnosis and safer deployments.
November 2024
October 2024
3 Commits
Oct 1, 2024October 2024 (percona/percona-server): Delivered stability-focused test-suite improvements targeting flaky tests in RocksDB autoinc_debug, performance_schema data_locks row ordering, and GTID synchronization. Replaced fragile wait mechanisms with robust wait scripts, enforced deterministic query results, and aligned with PS 8.4.3 post-merge MTR fixes. Impact: higher test reliability, fewer false failures, and faster CI feedback, improving release readiness and developer productivity. Technologies demonstrated included RocksDB, GTID, ACLs, MTR, performance_schema, and scripting for robust test automation.
October 2024
3 Commits
Oct 1, 2024October 2024 (percona/percona-server): Delivered stability-focused test-suite improvements targeting flaky tests in RocksDB autoinc_debug, performance_schema data_locks row ordering, and GTID synchronization. Replaced fragile wait mechanisms with robust wait scripts, enforced deterministic query results, and aligned with PS 8.4.3 post-merge MTR fixes. Impact: higher test reliability, fewer false failures, and faster CI feedback, improving release readiness and developer productivity. Technologies demonstrated included RocksDB, GTID, ACLs, MTR, performance_schema, and scripting for robust test automation.
Activity
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Quality Metrics
Correctness97.2%
Maintainability91.4%
Architecture94.2%
Performance88.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++SQLShell
Technical Skills
AuthenticationBug FixC++ DevelopmentConcurrency ControlData IntegrityDatabase InternalsDatabase TestingDebuggingGTIDInnoDBMemory ManagementPerformance SchemaReplicationSQLSQL Development
Repositories Contributed To
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