percona/percona-server-mongodb
Jan 2025 – Dec 2025
9 Months active
Languages Used
JavaScriptC++IDLYAML
Technical Skills
Backend DevelopmentConcurrency ControlDatabase TestingBuild System ManagementCode OrganizationConfiguration Management
Adi Zaimi
PROFILE
Adi Zaimi
Adi Zaimi contributed to the percona/percona-server-mongodb repository, focusing on backend development and database management using C++, JavaScript, and Bazel. Over nine months, Adi delivered features and fixes that improved sharding workflows, enhanced concurrency control, and strengthened data integrity during migrations. By refactoring core modules, optimizing build configurations, and introducing robust error handling, Adi addressed race conditions and improved CI reliability. The work included implementing session tracking for test hygiene, enforcing strict API validation, and adding retry mechanisms for resharding operations. These contributions resulted in more predictable production deployments and reduced operational risk, demonstrating depth in system architecture and reliability engineering.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
18Total
Bugs
8
Commits
18
Features
8
Lines of code
6,211
Activity Months9
Your Network
586 peopleSame Organization
@mongodb.com339
Shared Repositories
247
Work History
December 2025
2 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for percona/percona-server-mongodb focusing on reliability and usability improvements in index cloning and timeseries resharding. Delivered two features with concrete commit references and PRs to improve error messages for non-empty collections and to add a retry mechanism for slow resharding operations, increasing resilience to primary elections and transient delays. Business impact includes reduced support effort, clearer guidance for users, and more predictable resharding performance in production.
2 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for percona/percona-server-mongodb focusing on reliability and usability improvements in index cloning and timeseries resharding. Delivered two features with concrete commit references and PRs to improve error messages for non-empty collections and to add a retry mechanism for slow resharding operations, increasing resilience to primary elections and transient delays. Business impact includes reduced support effort, clearer guidance for users, and more predictable resharding performance in production.
December 2025
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 focused on stabilizing CI/test reliability and strengthening chunk migration resilience in percona/percona-server-mongodb. Key outcomes include CI stability improvements and enhanced migration observability and error handling, delivering business value by reducing test flakiness, accelerating triage, and increasing reliability of migration workflows.
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 focused on stabilizing CI/test reliability and strengthening chunk migration resilience in percona/percona-server-mongodb. Key outcomes include CI stability improvements and enhanced migration observability and error handling, delivering business value by reducing test flakiness, accelerating triage, and increasing reliability of migration workflows.
October 2025
2 Commits • 1 Features
Oct 1, 2025October 2025 Monthly Summary: Delivered targeted improvements in data integrity during migrations for the sharded Percona Server MongoDB, and tightened maintainability of range-deletion logic. The work mitigates migration-related data inconsistencies, strengthens reliability for production deployments, and enhances code clarity and future testability.
2 Commits • 1 Features
Oct 1, 2025October 2025 Monthly Summary: Delivered targeted improvements in data integrity during migrations for the sharded Percona Server MongoDB, and tightened maintainability of range-deletion logic. The work mitigates migration-related data inconsistencies, strengthens reliability for production deployments, and enhances code clarity and future testability.
October 2025
September 2025
3 Commits
Sep 1, 2025September 2025 — percona/percona-server-mongodb: Enhanced concurrency safety in core write paths and tightened CI reliability. Key changes focused on race-condition prevention during multi-update and resharding, plus improved test isolation in Bazel builds. Delivered concrete fixes with measurable impact on data integrity and CI stability.
September 2025
3 Commits
Sep 1, 2025September 2025 — percona/percona-server-mongodb: Enhanced concurrency safety in core write paths and tightened CI reliability. Key changes focused on race-condition prevention during multi-update and resharding, plus improved test isolation in Bazel builds. Delivered concrete fixes with measurable impact on data integrity and CI stability.
May 2025
1 Commits
May 1, 2025May 2025: Delivered a targeted Resharding Behavior fix for percona/percona-server-mongodb by disabling the gFeatureFlagReshardingCloneNoRefresh by default to address SERVER-104265. The change improves resharding predictability and stability by aligning default behavior with design intent, reducing the risk of unintended cloning during resharding workflows. Commit 5a04bd9deb2f5b16680f88e7bef60c61be49e662 (#36416) implements the fix and was validated through CI and code review.
1 Commits
May 1, 2025May 2025: Delivered a targeted Resharding Behavior fix for percona/percona-server-mongodb by disabling the gFeatureFlagReshardingCloneNoRefresh by default to address SERVER-104265. The change improves resharding predictability and stability by aligning default behavior with design intent, reducing the risk of unintended cloning during resharding workflows. Commit 5a04bd9deb2f5b16680f88e7bef60c61be49e662 (#36416) implements the fix and was validated through CI and code review.
May 2025
April 2025
2 Commits • 1 Features
Apr 1, 2025April 2025: Reliability and safe-default improvements in percona-server-mongodb. Delivered two focused changes with direct business value: (1) Bug fix ensuring correct shard status reporting; (2) Safer defaults to reduce unintended resharding behavior. These changes improve operational correctness and stability for sharded deployments in production.
April 2025
2 Commits • 1 Features
Apr 1, 2025April 2025: Reliability and safe-default improvements in percona-server-mongodb. Delivered two focused changes with direct business value: (1) Bug fix ensuring correct shard status reporting; (2) Safer defaults to reduce unintended resharding behavior. These changes improve operational correctness and stability for sharded deployments in production.
March 2025
3 Commits • 1 Features
Mar 1, 2025March 2025 focused on stabilizing and accelerating core resharding workflows for Percona Server for MongoDB, while strengthening data integrity checks. Key changes centered on build optimization for memory-constrained environments and strict API validation, delivering faster builds, lower memory usage, and more reliable production deployments.
3 Commits • 1 Features
Mar 1, 2025March 2025 focused on stabilizing and accelerating core resharding workflows for Percona Server for MongoDB, while strengthening data integrity checks. Key changes centered on build optimization for memory-constrained environments and strict API validation, delivering faster builds, lower memory usage, and more reliable production deployments.
March 2025
February 2025
2 Commits • 2 Features
Feb 1, 2025Concise monthly summary for February 2025 focused on feature work and code quality improvements in the percona/percona-server-mongodb repository.
February 2025
2 Commits • 2 Features
Feb 1, 2025Concise monthly summary for February 2025 focused on feature work and code quality improvements in the percona/percona-server-mongodb repository.
January 2025
1 Commits
Jan 1, 2025January 2025 monthly summary for percona/percona-server-mongodb. Focused on reliability and robustness improvements in test hygiene and hash verification. Implemented a targeted bug fix to prevent dangling test transactions from blocking the CheckReplDBHash hook, introducing a dedicated collection to track test session IDs and updating teardown to kill those sessions and drop the collection. This work, aligned with the commit SERVER-97605, reduces flaky test failures and ensures clean teardown and reliable hash checks across CI runs.
1 Commits
Jan 1, 2025January 2025 monthly summary for percona/percona-server-mongodb. Focused on reliability and robustness improvements in test hygiene and hash verification. Implemented a targeted bug fix to prevent dangling test transactions from blocking the CheckReplDBHash hook, introducing a dedicated collection to track test session IDs and updating teardown to kill those sessions and drop the collection. This work, aligned with the commit SERVER-97605, reduces flaky test failures and ensures clean teardown and reliable hash checks across CI runs.
January 2025
Activity
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Quality Metrics
Correctness95.6%
Maintainability88.8%
Architecture87.8%
Performance83.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++IDLJavaScriptYAML
Technical Skills
Backend DevelopmentBazelBuild System ConfigurationBuild System ManagementC++C++ DevelopmentC++ developmentCode OrganizationConcurrency ControlConfiguration ManagementDatabase AdministrationDatabase ManagementDatabase TestingJavaScriptMongoDB
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline