percona/percona-server-mongodb
Oct 2024 – Mar 2026
15 Months active
Languages Used
C++YAMLJavaScriptIDLMarkdownBazel
Technical Skills
Change StreamsCode RefactoringDatabase ManagementSystem AdministrationBackend DevelopmentC++
Haley Connelly
PROFILE
Haley Connelly
Haley Connelly contributed to the percona/percona-server-mongodb repository by engineering core database features and refactoring critical backend systems. Over 15 months, she delivered enhancements to storage engine APIs, catalog management, and replication workflows, focusing on maintainability and data consistency. Using C++, JavaScript, and YAML, Haley streamlined change stream handling, improved test infrastructure, and introduced UUID-based identifier generation to unify storage object management. Her work included optimizing oplog metadata tracking, enforcing single-tenant logic, and enabling robust cross-node consistency for replicated deployments. These efforts resulted in a cleaner codebase, reduced operational risk, and more predictable behavior in distributed MongoDB environments.
Overall Statistics
Feature vs Bugs
69%Features
Repository Contributions
42Total
Bugs
9
Commits
42
Features
20
Lines of code
16,408
Activity Months15
Your Network
586 peopleSame Organization
@mongodb.com339
Shared Repositories
247
Work History
March 2026
4 Commits • 2 Features
Mar 1, 2026Monthly work summary for 2026-03: Implemented critical oplog enhancements and code cleanups for improved replication reliability and maintainability in percona/percona-server-mongodb. Focus was on features that directly enhance replication performance metrics, reduce code complexity, and lay groundwork for future telemetry and optimization.
4 Commits • 2 Features
Mar 1, 2026Monthly work summary for 2026-03: Implemented critical oplog enhancements and code cleanups for improved replication reliability and maintainability in percona/percona-server-mongodb. Focus was on features that directly enhance replication performance metrics, reduce code complexity, and lay groundwork for future telemetry and optimization.
March 2026
February 2026
3 Commits • 2 Features
Feb 1, 2026February 2026 monthly summary for percona/percona-server-mongodb: Delivered two tightly scoped features that strengthen cross-node consistency and transaction lifecycle visibility, supported by targeted tests and opt-in configurability. These changes reduce the risk of replicated ID leakage during resharding, provide an opt-in mechanism to include replicated IDs in dbhash for cross-node checks, and improve tracking of uncommitted changes in multi-document transactions via a Snapshot decoration, preserving state across lifetimes.
February 2026
3 Commits • 2 Features
Feb 1, 2026February 2026 monthly summary for percona/percona-server-mongodb: Delivered two tightly scoped features that strengthen cross-node consistency and transaction lifecycle visibility, supported by targeted tests and opt-in configurability. These changes reduce the risk of replicated ID leakage during resharding, provide an opt-in mechanism to include replicated IDs in dbhash for cross-node checks, and improve tracking of uncommitted changes in multi-document transactions via a Snapshot decoration, preserving state across lifetimes.
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for percona/percona-server-mongodb: Delivered Change Stream Compatibility with recordIdsReplicated collections, enabling robust change stream behavior for collections with the recordIdsReplicated option. Implemented adjustments to tests (removed incompatibility tags and updated assertions) to reflect the new behavior, improving test reliability and coverage. No separate critical bug fixes were recorded; primary focus on feature delivery and test hygiene. Business impact: reduces integration risk for clients relying on change streams with recordIdsReplicated, enabling broader adoption and more predictable stream behavior. Technical highlights: changes to change streams, test suite updates (jstests), commits: 7ebacfca8c5d9cad38682f132752f80378452778; GitOrigin-RevId: 998c7f3872eefd6e696f28d4e256fb0341e62bc6. Repository: percona/percona-server-mongodb.
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for percona/percona-server-mongodb: Delivered Change Stream Compatibility with recordIdsReplicated collections, enabling robust change stream behavior for collections with the recordIdsReplicated option. Implemented adjustments to tests (removed incompatibility tags and updated assertions) to reflect the new behavior, improving test reliability and coverage. No separate critical bug fixes were recorded; primary focus on feature delivery and test hygiene. Business impact: reduces integration risk for clients relying on change streams with recordIdsReplicated, enabling broader adoption and more predictable stream behavior. Technical highlights: changes to change streams, test suite updates (jstests), commits: 7ebacfca8c5d9cad38682f132752f80378452778; GitOrigin-RevId: 998c7f3872eefd6e696f28d4e256fb0341e62bc6. Repository: percona/percona-server-mongodb.
January 2026
December 2025
2 Commits • 1 Features
Dec 1, 2025Monthly summary for 2025-12: Focused delivery in percona/percona-server-mongodb on test infrastructure stabilization and enhanced collection management for replicated deployments. Key outcomes include re-enabled and stabilized tests for the replicated record IDs variant on Amazon Linux 2023 and the introduction of support to create capped collections with the replicate record IDs option. These efforts improved test reliability, reduced regression risk in AL2023 environments, and extended data-management capabilities for replicated setups. Highlights include contributions tied to commits c88293704242578c887c7980133402a7a56d8154 and 7ce708b0d921b603c87b340171611d716979a086, with co-authored collaboration by Yuhong Zhang. Technologies exercised include test infrastructure stabilization, Linux environment validation, and expansion of MongoDB-compatible collection management features.
December 2025
2 Commits • 1 Features
Dec 1, 2025Monthly summary for 2025-12: Focused delivery in percona/percona-server-mongodb on test infrastructure stabilization and enhanced collection management for replicated deployments. Key outcomes include re-enabled and stabilized tests for the replicated record IDs variant on Amazon Linux 2023 and the introduction of support to create capped collections with the replicate record IDs option. These efforts improved test reliability, reduced regression risk in AL2023 environments, and extended data-management capabilities for replicated setups. Highlights include contributions tied to commits c88293704242578c887c7980133402a7a56d8154 and 7ce708b0d921b603c87b340171611d716979a086, with co-authored collaboration by Yuhong Zhang. Technologies exercised include test infrastructure stabilization, Linux environment validation, and expansion of MongoDB-compatible collection management features.
October 2025
1 Commits • 1 Features
Oct 1, 2025Concise monthly summary for 2025-10 focused on feature delivery and its business value for the Percona Server for MongoDB project. No major bugs reported this month; feature work concentrated on WiredTiger engine configurability and its impact on performance tuning and maintainability.
1 Commits • 1 Features
Oct 1, 2025Concise monthly summary for 2025-10 focused on feature delivery and its business value for the Percona Server for MongoDB project. No major bugs reported this month; feature work concentrated on WiredTiger engine configurability and its impact on performance tuning and maintainability.
October 2025
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025: Delivered a targeted optimization in the Percona Server MongoDB project by removing tenantId tracking from the pre-image truncation logic to enforce single-tenant operation, simplifying the codebase and reducing cross-tenant risk. The change is implemented in percona/percona-server-mongodb with commit b6588f5eaeae5b9e8220a6aaebf336989918507a (SERVER-109191; PR #41003). No major bugs were fixed this month; the focus was a high-value architectural improvement with clear business impact.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025: Delivered a targeted optimization in the Percona Server MongoDB project by removing tenantId tracking from the pre-image truncation logic to enforce single-tenant operation, simplifying the codebase and reducing cross-tenant risk. The change is implemented in percona/percona-server-mongodb with commit b6588f5eaeae5b9e8220a6aaebf336989918507a (SERVER-109191; PR #41003). No major bugs were fixed this month; the focus was a high-value architectural improvement with clear business impact.
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for percona/percona-server-mongodb focused on strengthening distributed catalog metadata handling, data consistency, and operational robustness across the server core. Delivered concrete changes in catalog ID management, cursor lifecycle for multi-node comparisons, and drop-pending ident hygiene. The work enhances reliability in disaggregated storage configurations and reduces risk of metadata inconsistencies during createCollection and validation workflows.
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for percona/percona-server-mongodb focused on strengthening distributed catalog metadata handling, data consistency, and operational robustness across the server core. Delivered concrete changes in catalog ID management, cursor lifecycle for multi-node comparisons, and drop-pending ident hygiene. The work enhances reliability in disaggregated storage configurations and reduces risk of metadata inconsistencies during createCollection and validation workflows.
July 2025
June 2025
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for percona/percona-server-mongodb: Delivered targeted fixes and enhancements to oplog-based collection creation and replication fidelity, plus improvements to test utilities. These changes strengthen data consistency during oplog replay, reduce operational risk in replicated deployments, and improve maintainability.
June 2025
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for percona/percona-server-mongodb: Delivered targeted fixes and enhancements to oplog-based collection creation and replication fidelity, plus improvements to test utilities. These changes strengthen data consistency during oplog replay, reduce operational risk in replicated deployments, and improve maintainability.
May 2025
5 Commits • 2 Features
May 1, 2025May 2025 performance review for percona/percona-server-mongodb: Delivered two high-impact changes that strengthen reliability, maintainability, and cross-node consistency in the storage catalog. First, a DurableCatalog internal refactor reorganized the catalog codebase by introducing MDBCatalog and a durable_catalog namespace, relocating catalog-related files, and simplifying index management signatures while aligning RecordStore options. Commits include 4085a07816b9bf106ff7a27cc8183a5ebcba9817; 4cad604863c3b4ae8ce70057c26f0f62e8d43918; 66d4466af38e0dcf90337431a50f98fa053f348d; 14cc97aaf66884fc9e4a742431ecb905672b31ce. Second, introduced a replication consistency feature flag featureFlagReplicateLocalCatalogIdentifiers to enable replication of local catalog identifiers across replica set nodes, ensuring consistent _mdb_catalog and ident mappings. Commit: 135539bb0a153422c37131edda05a1f1bf540f2e. Major bugs fixed: none explicitly listed; however, the refactor reduces defect risk through clearer separation of catalog concerns and streamlined signatures. Overall impact: improved modularity, maintainability, and cross-node consistency, laying groundwork for safer future catalog evolutions and faster feature delivery. Technologies/skills demonstrated: large-scale codebase refactoring, namespace/module organization, feature flag design and rollout, cross-repo collaboration, and thorough commit tracing.
5 Commits • 2 Features
May 1, 2025May 2025 performance review for percona/percona-server-mongodb: Delivered two high-impact changes that strengthen reliability, maintainability, and cross-node consistency in the storage catalog. First, a DurableCatalog internal refactor reorganized the catalog codebase by introducing MDBCatalog and a durable_catalog namespace, relocating catalog-related files, and simplifying index management signatures while aligning RecordStore options. Commits include 4085a07816b9bf106ff7a27cc8183a5ebcba9817; 4cad604863c3b4ae8ce70057c26f0f62e8d43918; 66d4466af38e0dcf90337431a50f98fa053f348d; 14cc97aaf66884fc9e4a742431ecb905672b31ce. Second, introduced a replication consistency feature flag featureFlagReplicateLocalCatalogIdentifiers to enable replication of local catalog identifiers across replica set nodes, ensuring consistent _mdb_catalog and ident mappings. Commit: 135539bb0a153422c37131edda05a1f1bf540f2e. Major bugs fixed: none explicitly listed; however, the refactor reduces defect risk through clearer separation of catalog concerns and streamlined signatures. Overall impact: improved modularity, maintainability, and cross-node consistency, laying groundwork for safer future catalog evolutions and faster feature delivery. Technologies/skills demonstrated: large-scale codebase refactoring, namespace/module organization, feature flag design and rollout, cross-repo collaboration, and thorough commit tracing.
May 2025
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025: Delivered Storage Engine API and Catalog Improvements for Percona Server MongoDB, consolidating API and catalog changes to improve configuration handling, data integrity, and API clarity across DurableCatalog, record store creation, and storage engine interactions. This work reduces configuration complexity, enforces data integrity, and simplifies record store creation flows across the storage engine.
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025: Delivered Storage Engine API and Catalog Improvements for Percona Server MongoDB, consolidating API and catalog changes to improve configuration handling, data integrity, and API clarity across DurableCatalog, record store creation, and storage engine interactions. This work reduces configuration complexity, enforces data integrity, and simplifies record store creation flows across the storage engine.
March 2025
5 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for percona/percona-server-mongodb. Focused on strengthening storage layer consistency, test stability, and maintainability through UUID-based identifier generation, targeted test management, and code cleanup. Key contributions centered on unified ident generation, temporary test management for investigation, and signature simplification to reduce future risks.
5 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for percona/percona-server-mongodb. Focused on strengthening storage layer consistency, test stability, and maintainability through UUID-based identifier generation, targeted test management, and code cleanup. Key contributions centered on unified ident generation, temporary test management for investigation, and signature simplification to reduce future risks.
March 2025
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for percona/percona-server-mongodb: Focused on code quality and maintainability in the indexing path. Delivered a targeted code cleanup that removes a redundant invariant check in createIndexOnEmptyCollection, with no change to behavior. This aligns with ongoing efforts to simplify critical code paths and reduce maintenance burden.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for percona/percona-server-mongodb: Focused on code quality and maintainability in the indexing path. Delivered a targeted code cleanup that removes a redundant invariant check in createIndexOnEmptyCollection, with no change to behavior. This aligns with ongoing efforts to simplify critical code paths and reduce maintenance burden.
January 2025
4 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for percona/percona-server-mongodb focused on delivering targeted reliability improvements and test stability across Change Streams, TTL index handling, and timeseries tests. Delivered a new lifecycle service for pre-image expiry, simplified TTL index monitoring by removing a fixer, and stabilized timeseries tests to reduce flaky behavior. These changes enhance data correctness, reduce maintenance burden, and improve CI reliability, supporting safer rollbacks and more predictable replica set operations.
4 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for percona/percona-server-mongodb focused on delivering targeted reliability improvements and test stability across Change Streams, TTL index handling, and timeseries tests. Delivered a new lifecycle service for pre-image expiry, simplified TTL index monitoring by removing a fixer, and stabilized timeseries tests to reduce flaky behavior. These changes enhance data correctness, reduce maintenance burden, and improve CI reliability, supporting safer rollbacks and more predictable replica set operations.
January 2025
November 2024
4 Commits • 2 Features
Nov 1, 2024Month: 2024-11 — Delivered targeted improvements to pre-image handling and codebase hygiene in percona/percona-server-mongodb, with focused test stability work. Business value centers on improved expiration accuracy for pre-images, robust sampling, maintainable code, and more reliable tests for ongoing development.
November 2024
4 Commits • 2 Features
Nov 1, 2024Month: 2024-11 — Delivered targeted improvements to pre-image handling and codebase hygiene in percona/percona-server-mongodb, with focused test stability work. Business value centers on improved expiration accuracy for pre-images, robust sampling, maintainable code, and more reliable tests for ongoing development.
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — Focused on simplifying the change stream feature set for percona-server-mongodb by removing the deprecated ChangeCollectionTruncateMarkers functionality. This included deleting related configuration, tests, and code, resulting in a cleaner, more maintainable change stream surface and reduced support burden. All changes were reviewed and validated through CI, with no regressions observed in change stream workflows.
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — Focused on simplifying the change stream feature set for percona-server-mongodb by removing the deprecated ChangeCollectionTruncateMarkers functionality. This included deleting related configuration, tests, and code, resulting in a cleaner, more maintainable change stream surface and reduced support burden. All changes were reviewed and validated through CI, with no regressions observed in change stream workflows.
October 2024
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Quality Metrics
Correctness95.6%
Maintainability91.0%
Architecture92.4%
Performance83.4%
AI Usage22.0%
Skills & Technologies
Programming Languages
BazelC++IDLJavaScriptMarkdownYAML
Technical Skills
API DesignBackend DevelopmentBuild System ManagementBuild SystemsC++C++ DevelopmentC++ developmentC++ programmingCI/CDCatalog ManagementChange Data CaptureChange StreamsCode CleanupCode OrganizationCode Refactoring
Repositories Contributed To
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