percona/percona-server-mongodb
Oct 2024 – Mar 2026
17 Months active
Languages Used
C++JavaScriptYAMLIDL
Technical Skills
Code OrganizationRefactoringCI/CDCode MaintenanceCode RefactoringCode Revert
Shin Yee Tan
PROFILE
Shin Yee Tan
Shinyee Tan contributed to the percona/percona-server-mongodb repository by engineering robust backend features and reliability improvements across storage, replication, and index build paths. Leveraging C++ and JavaScript, Shinyee refactored core components for maintainability, introduced feature-flagged safety gates for operations like applyOps, and enhanced concurrency control for transaction and recovery unit management. Their work included optimizing WiredTiger storage diagnostics, strengthening access control for rawData operations, and improving test suite alignment using YAML-driven configuration. By focusing on data integrity, observability, and performance, Shinyee delivered well-structured, traceable changes that improved system stability and enabled safer, more efficient database management at scale.
Overall Statistics
Feature vs Bugs
73%Features
Repository Contributions
76Total
Bugs
10
Commits
76
Features
27
Lines of code
12,805
Activity Months17
Your Network
586 peopleSame Organization
@mongodb.com339
Shared Repositories
247
Work History
March 2026
1 Commits • 1 Features
Mar 1, 2026Monthly summary for 2026-03 focusing on Percona Server for MongoDB work: Implemented safety-focused gating for applyOps via feature flags, addressing risk of unintended container operations in CI/CD. Fixed a critical validation bug to prevent ingest of unauthorized oplog entries, improving operational safety and data integrity. Delivered a controlled applyOps execution path that ensures testing gates are respected, aligning with governance and risk reduction.
1 Commits • 1 Features
Mar 1, 2026Monthly summary for 2026-03 focusing on Percona Server for MongoDB work: Implemented safety-focused gating for applyOps via feature flags, addressing risk of unintended container operations in CI/CD. Fixed a critical validation bug to prevent ingest of unauthorized oplog entries, improving operational safety and data integrity. Delivered a controlled applyOps execution path that ensures testing gates are respected, aligning with governance and risk reduction.
March 2026
February 2026
5 Commits • 2 Features
Feb 1, 2026February 2026 summary for percona/percona-server-mongodb: Strengthened reliability of index builds under heavy concurrent writes and multi-document transactions, and improved stability of retryable write paths with default oplog grouping. Delivered targeted tests, documentation clarifications, and gating strategies to reduce production risk in high-throughput deployments. Commit-level traceability aligns with multiple server tickets, enabling easier future maintenance and audits.
February 2026
5 Commits • 2 Features
Feb 1, 2026February 2026 summary for percona/percona-server-mongodb: Strengthened reliability of index builds under heavy concurrent writes and multi-document transactions, and improved stability of retryable write paths with default oplog grouping. Delivered targeted tests, documentation clarifications, and gating strategies to reduce production risk in high-throughput deployments. Commit-level traceability aligns with multiple server tickets, enabling easier future maintenance and audits.
January 2026
9 Commits • 2 Features
Jan 1, 2026Monthly Summary for 2026-01 Overview: Delivered substantial reliability and throughput improvements for the percona-server-mongodb replication and ChangeStream paths, with robust handling for regular oplog entries, single and batched writes, and enhanced pre-image tracking. Improvements span core write paths, validation, stability fixes, and contributor-facing documentation, delivering clear business value in data consistency, write throughput, and developer clarity. 1) Key features delivered - Oplog and batched-writes ChangeStream integration improvements: Implemented generation of regular oplog entries for single update and single container insert/delete operations; enhanced retryable writes handling; enables batched writes with ChangeStream support; records pre-images for batched operations; improved onBatchedWriteCommit reliability; integrates session catalog updates during batched writes. Commits include 8ece902c…, 96479e79…, f314b620…, 83d75dfb…, bc88ec95…, de26714e… - Documentation update: uncommitted writes and index builds: Documents incompatibility of uncommitted writes with primary-driven index builds to clarify expectations for future contributors. Commit: bd0d42a4… 2) Major bugs fixed - ChangeStream pre-image validation for applyOps: Corrects and validates pre-images handling for applyOps entries to ensure accurate tracking in change streams. Commit: 256dd85c… - Migration cloner null dereference fix: Adds null checks for the opAccumulator in MigrationChunkClonerSourceOpObserver to prevent crashes and improve stability. Commit: 1aca2fc6… 3) Overall impact and accomplishments - Enhanced data consistency and reliability across write paths with ChangeStream-aware batched writes, reducing retry overhead and ensuring accurate pre-image tracking. - Increased stability in migration workflows by eliminating a potential null-dereference crash in the MigrationChunkCloner, resulting in fewer production incidents during migrations. - Clearer contributor guidance around write behaviors and index build interactions, reducing onboarding friction and future defect risk. 4) Technologies/skills demonstrated - Advanced Change Streams handling, Oplog generation, and batched write workflows, including session catalog integration. - ApplyOps handling and pre-image lifecycle management for accurate change-stream telemetry. - Debugging and stability fixes in migration tooling (MigrationChunkClonerSourceOpObserver). - Documentation discipline to align feature behavior with operational expectations. - Cross-team collaboration evidenced by co-authored commits and multi-repo impact.
9 Commits • 2 Features
Jan 1, 2026Monthly Summary for 2026-01 Overview: Delivered substantial reliability and throughput improvements for the percona-server-mongodb replication and ChangeStream paths, with robust handling for regular oplog entries, single and batched writes, and enhanced pre-image tracking. Improvements span core write paths, validation, stability fixes, and contributor-facing documentation, delivering clear business value in data consistency, write throughput, and developer clarity. 1) Key features delivered - Oplog and batched-writes ChangeStream integration improvements: Implemented generation of regular oplog entries for single update and single container insert/delete operations; enhanced retryable writes handling; enables batched writes with ChangeStream support; records pre-images for batched operations; improved onBatchedWriteCommit reliability; integrates session catalog updates during batched writes. Commits include 8ece902c…, 96479e79…, f314b620…, 83d75dfb…, bc88ec95…, de26714e… - Documentation update: uncommitted writes and index builds: Documents incompatibility of uncommitted writes with primary-driven index builds to clarify expectations for future contributors. Commit: bd0d42a4… 2) Major bugs fixed - ChangeStream pre-image validation for applyOps: Corrects and validates pre-images handling for applyOps entries to ensure accurate tracking in change streams. Commit: 256dd85c… - Migration cloner null dereference fix: Adds null checks for the opAccumulator in MigrationChunkClonerSourceOpObserver to prevent crashes and improve stability. Commit: 1aca2fc6… 3) Overall impact and accomplishments - Enhanced data consistency and reliability across write paths with ChangeStream-aware batched writes, reducing retry overhead and ensuring accurate pre-image tracking. - Increased stability in migration workflows by eliminating a potential null-dereference crash in the MigrationChunkCloner, resulting in fewer production incidents during migrations. - Clearer contributor guidance around write behaviors and index build interactions, reducing onboarding friction and future defect risk. 4) Technologies/skills demonstrated - Advanced Change Streams handling, Oplog generation, and batched write workflows, including session catalog integration. - ApplyOps handling and pre-image lifecycle management for accurate change-stream telemetry. - Debugging and stability fixes in migration tooling (MigrationChunkClonerSourceOpObserver). - Documentation discipline to align feature behavior with operational expectations. - Cross-team collaboration evidenced by co-authored commits and multi-repo impact.
January 2026
December 2025
2 Commits • 1 Features
Dec 1, 2025Month 2025-12: Focused on robustness and throughput of index maintenance in percona/percona-server-mongodb. Delivered enhancements to index operations during draining and index builds to improve consistency, reliability, and efficiency under production workloads. Key changes include: (1) writing container insert/delete oplog entries during draining to strengthen replication/data integrity; (2) enabling grouping of inserts during primary-driven index builds by default to boost write throughput. These changes reduce risk of data drift during index maintenance and improve throughput for index-heavy workloads. Commits implementing these changes include 30d846b8e409c907417becb24d8ddd41cee63803 and bb49d61404d500cd791c4feb73f2d64c1a3e1a92. While there were no distinct bug fixes documented for this repo in December 2025, the feature work directly enhances reliability and performance in production scenarios.
December 2025
2 Commits • 1 Features
Dec 1, 2025Month 2025-12: Focused on robustness and throughput of index maintenance in percona/percona-server-mongodb. Delivered enhancements to index operations during draining and index builds to improve consistency, reliability, and efficiency under production workloads. Key changes include: (1) writing container insert/delete oplog entries during draining to strengthen replication/data integrity; (2) enabling grouping of inserts during primary-driven index builds by default to boost write throughput. These changes reduce risk of data drift during index maintenance and improve throughput for index-heavy workloads. Commits implementing these changes include 30d846b8e409c907417becb24d8ddd41cee63803 and bb49d61404d500cd791c4feb73f2d64c1a3e1a92. While there were no distinct bug fixes documented for this repo in December 2025, the feature work directly enhances reliability and performance in production scenarios.
November 2025
3 Commits
Nov 1, 2025November 2025 monthly summary for percona/percona-server-mongodb: delivered reliability-focused changes to database operations and clarified transaction batching. Key changes gated DBCheck to contexts that support local collections and ensured last operations are committed before index builds, including switching to awaitLastOpCommitted for interrupted rolling index builds. Documentation was clarified to explicitly state that batching supports multi-document transactions, removing prior limitations. These changes reduce the risk of partial index builds, improve data integrity, and enhance developer clarity.
3 Commits
Nov 1, 2025November 2025 monthly summary for percona/percona-server-mongodb: delivered reliability-focused changes to database operations and clarified transaction batching. Key changes gated DBCheck to contexts that support local collections and ensured last operations are committed before index builds, including switching to awaitLastOpCommitted for interrupted rolling index builds. Documentation was clarified to explicitly state that batching supports multi-document transactions, removing prior limitations. These changes reduce the risk of partial index builds, improve data integrity, and enhance developer clarity.
November 2025
October 2025
5 Commits • 4 Features
Oct 1, 2025Monthly performance and reliability summary for 2025-10 focused on Percona Server for MongoDB. Delivered key capabilities to improve throughput, data integrity, and maintainability, with traceable commits across the repo. Highlights include threading and hashing improvements for oplog application, safer write behavior during index builds, and planning for future index build improvements.
October 2025
5 Commits • 4 Features
Oct 1, 2025Monthly performance and reliability summary for 2025-10 focused on Percona Server for MongoDB. Delivered key capabilities to improve throughput, data integrity, and maintainability, with traceable commits across the repo. Highlights include threading and hashing improvements for oplog application, safer write behavior during index builds, and planning for future index build improvements.
September 2025
2 Commits • 2 Features
Sep 1, 2025September 2025 performance and observability focus for percona-server-mongodb. Delivered two core features aimed at improving replication efficiency and storage metrics visibility, with enhanced logging for better diagnostics. No major bug fixes were reported in the provided scope; the month centered on delivering features with clear business value and measurable technical impact.
2 Commits • 2 Features
Sep 1, 2025September 2025 performance and observability focus for percona-server-mongodb. Delivered two core features aimed at improving replication efficiency and storage metrics visibility, with enhanced logging for better diagnostics. No major bug fixes were reported in the provided scope; the month centered on delivering features with clear business value and measurable technical impact.
September 2025
July 2025
10 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for the repository percona/percona-server-mongodb. Focused on improving observability, data integrity, and recovery-path consistency across the storage engine. Delivered two major initiatives with cross-engine impact, reinforced by multiple commits that standardize interfaces and reporting for future stability and scalability.
July 2025
10 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for the repository percona/percona-server-mongodb. Focused on improving observability, data integrity, and recovery-path consistency across the storage engine. Delivered two major initiatives with cross-engine impact, reinforced by multiple commits that standardize interfaces and reporting for future stability and scalability.
June 2025
4 Commits • 2 Features
Jun 1, 2025June 2025 performance summary for percona/percona-server-mongodb. Focused on simplifying the WiredTiger storage layer, strengthening diagnostics, and improving configurability of the spill engine. These efforts reduced maintenance complexity, improved observability, and enabled faster issue identification and tuning.
4 Commits • 2 Features
Jun 1, 2025June 2025 performance summary for percona/percona-server-mongodb. Focused on simplifying the WiredTiger storage layer, strengthening diagnostics, and improving configurability of the spill engine. These efforts reduced maintenance complexity, improved observability, and enabled faster issue identification and tuning.
June 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for percona/percona-server-mongodb: Focused on aligning the test suite with BuildBaron to ensure tests reflect updated outputs and structures. Implemented YAML-driven changes to test configurations, including adding, removing, and reordering server test file paths. No major bugs fixed this period. This work enhances CI reliability, reduces test drift, and accelerates validation of changes, contributing to faster, more predictable release cycles. Key skills demonstrated include YAML-based test configuration, BuildBaron integration, and Git-based change tracking (commit 61022d54eb48d37715b64c7c0120f7a9a3aaf9aa).
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for percona/percona-server-mongodb: Focused on aligning the test suite with BuildBaron to ensure tests reflect updated outputs and structures. Implemented YAML-driven changes to test configurations, including adding, removing, and reordering server test file paths. No major bugs fixed this period. This work enhances CI reliability, reduces test drift, and accelerates validation of changes, contributing to faster, more predictable release cycles. Key skills demonstrated include YAML-based test configuration, BuildBaron integration, and Git-based change tracking (commit 61022d54eb48d37715b64c7c0120f7a9a3aaf9aa).
April 2025
6 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for percona/percona-server-mongodb focused on delivering business value and technical excellence. Key features delivered include RawData API enhancements with default enablement across explain outputs and mirrored read paths, expanding rawData coverage to experiments and tests; updated FCV/test constraints to support default RawData CRUD. In addition, timeseries tests were migrated to rely on the raw data API to improve test coverage and reliability. Major reliability and performance improvements include bypassing admission control for storage stats fetch and simplifying atomic operations to reduce object overhead, contributing to lower latency and improved throughput. These changes collectively improve observability, consistency of explain results, and overall system stability. Technologies and skills demonstrated include feature flag management and FCV governance, internal storage metrics optimization, atomic operation optimization, explain plan integration for rawData, and broader test modernization for timeseries workloads.
6 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for percona/percona-server-mongodb focused on delivering business value and technical excellence. Key features delivered include RawData API enhancements with default enablement across explain outputs and mirrored read paths, expanding rawData coverage to experiments and tests; updated FCV/test constraints to support default RawData CRUD. In addition, timeseries tests were migrated to rely on the raw data API to improve test coverage and reliability. Major reliability and performance improvements include bypassing admission control for storage stats fetch and simplifying atomic operations to reduce object overhead, contributing to lower latency and improved throughput. These changes collectively improve observability, consistency of explain results, and overall system stability. Technologies and skills demonstrated include feature flag management and FCV governance, internal storage metrics optimization, atomic operation optimization, explain plan integration for rawData, and broader test modernization for timeseries workloads.
April 2025
March 2025
13 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for percona/percona-server-mongodb development work focused on rawData time-series support, security controls, and test reliability. Key features and fixes delivered include explain and execution path enhancements for rawData time-series queries, stronger authorization for rawData operations, and GetMore support for rawData-backed cursors. These changes improve correctness of query planning and execution, enforce stricter access controls with a new privilege, and expand test coverage to reduce regression risk in time-series workloads.
March 2025
13 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for percona/percona-server-mongodb development work focused on rawData time-series support, security controls, and test reliability. Key features and fixes delivered include explain and execution path enhancements for rawData time-series queries, stronger authorization for rawData operations, and GetMore support for rawData-backed cursors. These changes improve correctness of query planning and execution, enforce stricter access controls with a new privilege, and expand test coverage to reduce regression risk in time-series workloads.
February 2025
3 Commits • 1 Features
Feb 1, 2025February 2025: Delivered critical reliability and maintainability work for percona/percona-server-mongodb. Key items: (1) Recovery Unit Management Correctness and Metrics Reporting: fixed concurrency issues by explicitly acquiring and passing a client lock when calling releaseRecoveryUnit and setRecoveryUnit to prevent deadlocks during recovery unit management; improved storage metrics accuracy during recovery unit swaps, spilling, and capped deletes to avoid double-counting or data loss. (2) Codebase Maintenance: OpDebug Refactor and Build/Ownership Updates: moved OpDebug to its own file to improve code organization and maintainability; updated build configurations and code ownership rules, with minor adjustments to performance thresholds related to the date change. Notable commits: 11cb3afb769ad674316d0a7e3218c766a16a65da; 850720ef63fc6d3ef6c4438080700ed568c9eba6; 9941bb03e9c4240146998127f3e88adff961ee4c.
3 Commits • 1 Features
Feb 1, 2025February 2025: Delivered critical reliability and maintainability work for percona/percona-server-mongodb. Key items: (1) Recovery Unit Management Correctness and Metrics Reporting: fixed concurrency issues by explicitly acquiring and passing a client lock when calling releaseRecoveryUnit and setRecoveryUnit to prevent deadlocks during recovery unit management; improved storage metrics accuracy during recovery unit swaps, spilling, and capped deletes to avoid double-counting or data loss. (2) Codebase Maintenance: OpDebug Refactor and Build/Ownership Updates: moved OpDebug to its own file to improve code organization and maintainability; updated build configurations and code ownership rules, with minor adjustments to performance thresholds related to the date change. Notable commits: 11cb3afb769ad674316d0a7e3218c766a16a65da; 850720ef63fc6d3ef6c4438080700ed568c9eba6; 9941bb03e9c4240146998127f3e88adff961ee4c.
February 2025
January 2025
1 Commits
Jan 1, 2025Month: 2025-01 focused on delivering a critical thread-safety and correctness fix for transaction statistics in CurOp within the percona/percona-server-mongodb repository. The change refactors transaction stats updates to require a ClientLock, improving concurrency safety and measurement accuracy without altering external behavior.
January 2025
1 Commits
Jan 1, 2025Month: 2025-01 focused on delivering a critical thread-safety and correctness fix for transaction statistics in CurOp within the percona/percona-server-mongodb repository. The change refactors transaction stats updates to require a ClientLock, improving concurrency safety and measurement accuracy without altering external behavior.
December 2024
5 Commits • 2 Features
Dec 1, 2024Monthly summary for 2024-12 — percona/percona-server-mongodb. Focused monthly delivery highlights key features, major bug fixes, overall impact, and skills demonstrated. Emphasizes business value through stability, reliability, and observable improvements.
5 Commits • 2 Features
Dec 1, 2024Monthly summary for 2024-12 — percona/percona-server-mongodb. Focused monthly delivery highlights key features, major bug fixes, overall impact, and skills demonstrated. Emphasizes business value through stability, reliability, and observable improvements.
December 2024
November 2024
5 Commits • 2 Features
Nov 1, 20242024-11 monthly summary for percona/percona-server-mongodb: Focused on improving cross-platform stability, refining CurOp-related code paths, and documenting ticket references. Key work included an initial CurOp code refactor with storage metrics and conflict tracking, followed by a revert that centralized conflict metrics within OpDebug additive metrics. Windows test suite stability was enhanced by skipping TLS-incompatible tests to prevent flaky runs, and documentation was updated to reflect SERVER-90937. Technologies and skills demonstrated include C++ code refactoring, Git-based change management, cross-platform testing, and test-suite configuration.
November 2024
5 Commits • 2 Features
Nov 1, 20242024-11 monthly summary for percona/percona-server-mongodb: Focused on improving cross-platform stability, refining CurOp-related code paths, and documenting ticket references. Key work included an initial CurOp code refactor with storage metrics and conflict tracking, followed by a revert that centralized conflict metrics within OpDebug additive metrics. Windows test suite stability was enhanced by skipping TLS-incompatible tests to prevent flaky runs, and documentation was updated to reflect SERVER-90937. Technologies and skills demonstrated include C++ code refactoring, Git-based change management, cross-platform testing, and test-suite configuration.
October 2024
1 Commits • 1 Features
Oct 1, 2024October 2024 — Percona Server MongoDB: Focused feature delivery with groundwork for maintainability. Delivered Counter Operations Namespace Refactor: moved CounterOps from the concurrency directory to a dedicated namespace under stats, consolidating counter operation utilities and updating references across components to use the new namespace. No major bugs fixed this month; ongoing reliability remained stable. Impact: Improved modularity, consistency, and future extensibility for counter-related metrics; supports easier testing and future enhancements. Technologies: Go, refactoring, modular namespace design, cross-component refactoring.
1 Commits • 1 Features
Oct 1, 2024October 2024 — Percona Server MongoDB: Focused feature delivery with groundwork for maintainability. Delivered Counter Operations Namespace Refactor: moved CounterOps from the concurrency directory to a dedicated namespace under stats, consolidating counter operation utilities and updating references across components to use the new namespace. No major bugs fixed this month; ongoing reliability remained stable. Impact: Improved modularity, consistency, and future extensibility for counter-related metrics; supports easier testing and future enhancements. Technologies: Go, refactoring, modular namespace design, cross-component refactoring.
October 2024
Activity
Loading activity data...
Quality Metrics
Correctness94.4%
Maintainability89.4%
Architecture89.8%
Performance82.6%
AI Usage21.4%
Skills & Technologies
Programming Languages
C++IDLJavaScriptYAML
Technical Skills
API DesignAccess ControlAuthorizationBSON handlingBackend DevelopmentBuild System ConfigurationC++C++ DevelopmentC++ developmentC++ programmingCI/CDCode MaintenanceCode OrganizationCode Ownership ManagementCode Refactoring
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline