tarantool/tarantool
Aug 2024 – Apr 2026
15 Months active
Languages Used
CC++LuaShellPython
Technical Skills
C programmingC++backend developmentdata retrievaldatabase indexingperformance testing
Magomed Kostoev
PROFILE
Magomed Kostoev
Mikhail Kostoev contributed core engineering work to the tarantool/tarantool repository, delivering features and fixes that advanced database performance, reliability, and maintainability. He implemented optimized index read views, secondary key sorting, and configurable field compression, using C, C++, and Lua to address low-level memory management and data structure challenges. His approach emphasized modular architecture, robust testing, and codebase cleanup, including refactoring privilege handling and improving test automation. By standardizing APIs and enhancing recovery mechanisms, Mikhail improved both developer ergonomics and system resilience. His work demonstrated depth in backend development, algorithm design, and system programming, consistently addressing complex, foundational problems.
Overall Statistics
Feature vs Bugs
84%Features
Repository Contributions
36Total
Bugs
4
Commits
36
Features
21
Lines of code
7,846
Activity Months15
Your Network
50 peopleWork History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026: tarantool/tarantool — Implemented Compression Options API Standardization by introducing a dedicated 'type' key for compression options and enforcing string keys. Removed the previous approach of specifying type via the first element, clarifying the API and reducing configuration errors. Updated tests to validate the new structure and error handling, improving reliability and developer experience.
1 Commits • 1 Features
Apr 1, 2026April 2026: tarantool/tarantool — Implemented Compression Options API Standardization by introducing a dedicated 'type' key for compression options and enforcing string keys. Removed the previous approach of specifying type via the first element, clarifying the API and reducing configuration errors. Updated tests to validate the new structure and error handling, improving reliability and developer experience.
April 2026
February 2026
6 Commits • 1 Features
Feb 1, 2026February 2026 — Tarantool core: delivered stronger xrow test coverage and core stability improvements, directly contributing to reliability of IPROTO encoding/decoding paths and safer memory usage under load. This month’s work reduces production defects, eases maintenance, and strengthens security posture by validating critical data paths and fixing foundational issues.
February 2026
6 Commits • 1 Features
Feb 1, 2026February 2026 — Tarantool core: delivered stronger xrow test coverage and core stability improvements, directly contributing to reliability of IPROTO encoding/decoding paths and safer memory usage under load. This month’s work reduces production defects, eases maintenance, and strengthens security posture by validating critical data paths and fixing foundational issues.
January 2026
3 Commits • 2 Features
Jan 1, 2026January 2026: Delivered configurable field compression capabilities and codebase modularity improvements for tarantool/tarantool, setting the stage for core/EE decoupling and long-term maintainability. No explicit bug fixes reported within the provided scope.
3 Commits • 2 Features
Jan 1, 2026January 2026: Delivered configurable field compression capabilities and codebase modularity improvements for tarantool/tarantool, setting the stage for core/EE decoupling and long-term maintainability. No explicit bug fixes reported within the provided scope.
January 2026
December 2025
3 Commits • 1 Features
Dec 1, 2025Month 2025-12 — Tarantool/tarantool: Codebase Maintenance and Refactor focusing on cleanup, compiler compatibility, and memory-management simplification. Removed unused APIs, modernized privileges handling via enums, and streamlined memory sizing by relying on matras_allocator. These changes reduce maintenance overhead, minimize surface area for regressions, and lay groundwork for safer, future refactors.
December 2025
3 Commits • 1 Features
Dec 1, 2025Month 2025-12 — Tarantool/tarantool: Codebase Maintenance and Refactor focusing on cleanup, compiler compatibility, and memory-management simplification. Removed unused APIs, modernized privileges handling via enums, and streamlined memory sizing by relying on matras_allocator. These changes reduce maintenance overhead, minimize surface area for regressions, and lay groundwork for safer, future refactors.
November 2025
2 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Delivered enhancements to replication network configuration and improved system view access control in tarantool/tarantool, with accompanying tests and notes. The work strengthens deployment flexibility, security posture, and test coverage, contributing to more reliable replication setups and consistent access semantics.
2 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Delivered enhancements to replication network configuration and improved system view access control in tarantool/tarantool, with accompanying tests and notes. The work strengthens deployment flexibility, security posture, and test coverage, contributing to more reliable replication setups and consistent access semantics.
November 2025
October 2025
2 Commits • 2 Features
Oct 1, 2025October 2025 monthly summary for tarantool/tarantool: Delivered two focused features that improve developer experience and API usability, with no major bug fixes reported for the period. Key features delivered: - GDB pretty-printer now shows flag bit names for tuple flags (commit d3830b9c4744c74b4be2cd52dce09c062b284ae4), enhancing readability and debuggability. - Exposed box.schema.needs_upgrade API under the box.schema namespace (commit 68955ea2aabbb17d339975d53a2ac7c21d7294d1), simplifying schema upgrade checks. Major bugs fixed: none reported in this period. Overall impact and accomplishments: improved debugging UX, clearer API surface, and more deterministic upgrade workflows, contributing to maintainability and faster issue diagnosis. Technologies/skills demonstrated: C, Lua, GDB tooling integration, API design, internal-to-public refactoring, and disciplined code review with traceable commits.
October 2025
2 Commits • 2 Features
Oct 1, 2025October 2025 monthly summary for tarantool/tarantool: Delivered two focused features that improve developer experience and API usability, with no major bug fixes reported for the period. Key features delivered: - GDB pretty-printer now shows flag bit names for tuple flags (commit d3830b9c4744c74b4be2cd52dce09c062b284ae4), enhancing readability and debuggability. - Exposed box.schema.needs_upgrade API under the box.schema namespace (commit 68955ea2aabbb17d339975d53a2ac7c21d7294d1), simplifying schema upgrade checks. Major bugs fixed: none reported in this period. Overall impact and accomplishments: improved debugging UX, clearer API surface, and more deterministic upgrade workflows, contributing to maintainability and faster issue diagnosis. Technologies/skills demonstrated: C, Lua, GDB tooling integration, API design, internal-to-public refactoring, and disciplined code review with traceable commits.
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for tarantool/tarantool: Focused on test infrastructure performance improvements. Implemented consolidation of sort data tests into a smaller, more comprehensive suite and parallelized the invalid sort data test, aimed at reducing CI time and accelerating feedback for changes to the sort data path. No major bugs fixed this month. Commit 5177db124a76cdf282cd545098db45bd236a1db3 was applied to speed up the sort data machinery test, with potential downstream benefits to reliability and throughput.
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for tarantool/tarantool: Focused on test infrastructure performance improvements. Implemented consolidation of sort data tests into a smaller, more comprehensive suite and parallelized the invalid sort data test, aimed at reducing CI time and accelerating feedback for changes to the sort data path. No major bugs fixed this month. Commit 5177db124a76cdf282cd545098db45bd236a1db3 was applied to speed up the sort data machinery test, with potential downstream benefits to reliability and throughput.
August 2025
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for tarantool/tarantool focused on MemTX recovery optimization to improve startup performance, memory efficiency, and testing resilience.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for tarantool/tarantool focused on MemTX recovery optimization to improve startup performance, memory efficiency, and testing resilience.
May 2025
3 Commits • 3 Features
May 1, 2025May 2025 performance and maintainability enhancements for tarantool/tarantool. Delivered three key features that lay groundwork for faster tests, safer garbage collection, and scalable sort operations, aligning with business goals of reliability, speed, and maintainability.
3 Commits • 3 Features
May 1, 2025May 2025 performance and maintainability enhancements for tarantool/tarantool. Delivered three key features that lay groundwork for faster tests, safer garbage collection, and scalable sort operations, aligning with business goals of reliability, speed, and maintainability.
May 2025
April 2025
6 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for tarantool/tarantool focusing on performance and reliability improvements across MemTX, Vinyl, and MemCS. Implemented an O(n) secondary key build by persisting sort data with snapshots, added memtx_use_sort_data option with tests and error handling; added comprehensive checkpoint and recovery performance tests across engines with Lua benchmarks and CMake integration; improved recovery reliability via checkpoint refactor, simplified final recovery logic, and newly introduced pointer-to-pointer hash in core library to support future recovery features. These initiatives reduce snapshot times for large datasets, strengthen data integrity, and improve maintainability, enabling faster deployment and safer scale for large deployments.
April 2025
6 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for tarantool/tarantool focusing on performance and reliability improvements across MemTX, Vinyl, and MemCS. Implemented an O(n) secondary key build by persisting sort data with snapshots, added memtx_use_sort_data option with tests and error handling; added comprehensive checkpoint and recovery performance tests across engines with Lua benchmarks and CMake integration; improved recovery reliability via checkpoint refactor, simplified final recovery logic, and newly introduced pointer-to-pointer hash in core library to support future recovery features. These initiatives reduce snapshot times for large datasets, strengthen data integrity, and improve maintainability, enabling faster deployment and safer scale for large deployments.
February 2025
1 Commits
Feb 1, 2025February 2025: Tarantool/Tarantool - Focus on stability and memory correctness in testing components. Resolved a Clang memory-management warning in BPS tree perf tests by replacing std::unique_ptr with a raw pointer in DummyAllocator to fix non-standard layout and ensure correct memory handling in tests. Change is isolated with minimal risk and clear commit trace. Commit: 0a9258e2d4bb956d44b0d00213d105b39bf70633.
1 Commits
Feb 1, 2025February 2025: Tarantool/Tarantool - Focus on stability and memory correctness in testing components. Resolved a Clang memory-management warning in BPS tree perf tests by replacing std::unique_ptr with a raw pointer in DummyAllocator to fix non-standard layout and ensure correct memory handling in tests. Change is isolated with minimal risk and clear commit trace. Commit: 0a9258e2d4bb956d44b0d00213d105b39bf70633.
February 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024Monthly summary for 2024-12: Delivered a new bit-level operation to improve memory manipulation efficiency in tarantool/tarantool. Implemented bit_copy_range() in lib/bit to copy bits between non-overlapping memory regions, with correct handling of partial bytes at the start and end. Added comprehensive unit tests covering multiple edge cases to ensure correctness and prevent regressions. This work lays groundwork for optimized bitwise processing across modules and can improve performance of bit-oriented code paths.
December 2024
1 Commits • 1 Features
Dec 1, 2024Monthly summary for 2024-12: Delivered a new bit-level operation to improve memory manipulation efficiency in tarantool/tarantool. Implemented bit_copy_range() in lib/bit to copy bits between non-overlapping memory regions, with correct handling of partial bytes at the start and end. Added comprehensive unit tests covering multiple edge cases to ensure correctness and prevent regressions. This work lays groundwork for optimized bitwise processing across modules and can improve performance of bit-oriented code paths.
October 2024
1 Commits
Oct 1, 2024In Oct 2024, delivered a targeted bug fix for tarantool/tarantool that corrects role visibility in vuser space. The fix ensures users can view all roles granted to them, including transitive roles, improving the accuracy of box.schema.user.info() and role management. The change is traceable to commit 0280afce5cfaf46d4383f35613de683578da4e8a and aligns with security and administration expectations, delivering tangible business value by reducing admin confusion and strengthening access-control auditing.
1 Commits
Oct 1, 2024In Oct 2024, delivered a targeted bug fix for tarantool/tarantool that corrects role visibility in vuser space. The fix ensures users can view all roles granted to them, including transitive roles, improving the accuracy of box.schema.user.info() and role management. The change is traceable to commit 0280afce5cfaf46d4383f35613de683578da4e8a and aligns with security and administration expectations, delivering tangible business value by reducing admin confusion and strengthening access-control auditing.
October 2024
September 2024
2 Commits • 2 Features
Sep 1, 20242024-09 monthly summary for tarantool/tarantool focusing on feature delivery and reliability improvements. Key work this month centered on expanding visibility and efficiency in the storage/schema path and ensuring MVCC-related processes are robust. Delivered two targeted enhancements: (1) exposure of check_iterator_type via box.internal to support the read view count Lua interface, enabling richer schema module interactions and telemetry; (2) optimization of the snapshot cleaner to operate only on in-index tuples, increasing cleaning efficiency and reducing unnecessary storage of historical tuples. Also implemented MVCC-mode related integrity enhancements by ensuring alter statements are processed only in no-MVCC mode, strengthening the snapshot process reliability. These changes contribute to clearer developer ergonomics, better performance in data cleanliness, and stronger transactional consistency.
September 2024
2 Commits • 2 Features
Sep 1, 20242024-09 monthly summary for tarantool/tarantool focusing on feature delivery and reliability improvements. Key work this month centered on expanding visibility and efficiency in the storage/schema path and ensuring MVCC-related processes are robust. Delivered two targeted enhancements: (1) exposure of check_iterator_type via box.internal to support the read view count Lua interface, enabling richer schema module interactions and telemetry; (2) optimization of the snapshot cleaner to operate only on in-index tuples, increasing cleaning efficiency and reducing unnecessary storage of historical tuples. Also implemented MVCC-mode related integrity enhancements by ensuring alter statements are processed only in no-MVCC mode, strengthening the snapshot process reliability. These changes contribute to clearer developer ergonomics, better performance in data cleanliness, and stronger transactional consistency.
August 2024
3 Commits • 2 Features
Aug 1, 2024August 2024 at tarantool/tarantool delivered two high-impact feature workstreams, advancing read-path performance and enterprise-read-view capabilities. Key work focused on index read view enhancements and Enterprise Edition memtx read view support, with corresponding build integration for Tarantool EE.
3 Commits • 2 Features
Aug 1, 2024August 2024 at tarantool/tarantool delivered two high-impact feature workstreams, advancing read-path performance and enterprise-read-view capabilities. Key work focused on index read view enhancements and Enterprise Edition memtx read view support, with corresponding build integration for Tarantool EE.
August 2024
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Quality Metrics
Correctness95.2%
Maintainability90.8%
Architecture90.2%
Performance89.0%
AI Usage20.6%
Skills & Technologies
Programming Languages
CC++LuaPythonShell
Technical Skills
API DesignAlgorithm DesignBackend DevelopmentBenchmarkingBit manipulationC programmingC++C++ developmentC++ programmingC/C++ developmentCMakeCallback FunctionsCheckpointingCode OptimizationConcurrency Control
Repositories Contributed To
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