ydb-platform/nbs
Nov 2024 – May 2026
18 Months active
Languages Used
CC++GoPythonprotobufShellYAMLProto
Technical Skills
Backend DevelopmentC++CSI Driver DevelopmentCache ManagementConfiguration ManagementData Structures
Evgeny Budilovsky
PROFILE
Evgeny Budilovsky
Over 18 months, contributed to the ydb-platform/nbs repository by designing and optimizing backend storage systems with a focus on reliability, performance, and configurability. Developed features such as multi-queue filestore processing, advanced cache management, and granular concurrency controls, leveraging C++, Go, and Python. Enhanced system observability and diagnostics through improved logging, profiling, and error propagation, while strengthening security with refined permissions and ACL handling. Addressed complex challenges in distributed file systems, including atomic operations, thread safety, and data integrity under load. Maintained high code quality through rigorous unit testing, CI/CD integration, and detailed documentation, supporting scalable and maintainable infrastructure.
Overall Statistics
Feature vs Bugs
76%Features
Repository Contributions
89Total
Bugs
15
Commits
89
Features
48
Lines of code
15,604
Activity Months18
Your Network
97 peopleSame Organization
@nebius.com65
Anton RomanovMember
Aaron MillerMember
Aaron FaganMember
afonsonebiusMember
Andrey KorzinevMember
Akim TsvigunMember
Aleksandr GaevMember
Alyona VorobyovaMember
Alex SaltMember
Work History
May 2026
5 Commits • 2 Features
May 1, 2026Month: 2026-05 Summary: In May, the nbs repository delivered measurable improvements in memory diagnostics, profiling reliability, and concurrent queue performance, aligning with business goals of cost efficiency, reliability, and scalable throughput. The main work focused on enhanced memory diagnostics, tcmalloc metrics collection, and a sharded FSyncQueue to reduce contention, backed by a comprehensive multi-threaded benchmarking suite to validate performance under load.
5 Commits • 2 Features
May 1, 2026Month: 2026-05 Summary: In May, the nbs repository delivered measurable improvements in memory diagnostics, profiling reliability, and concurrent queue performance, aligning with business goals of cost efficiency, reliability, and scalable throughput. The main work focused on enhanced memory diagnostics, tcmalloc metrics collection, and a sharded FSyncQueue to reduce contention, backed by a comprehensive multi-threaded benchmarking suite to validate performance under load.
May 2026
April 2026
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for ydb-platform/nbs focusing on security, reliability, and observability. Delivered two high-impact changes that improve business value: enhanced guest access control through Filestore local service ACL propagation and stabilized request processing by fixing a throttler logging race condition. These efforts reduce security risks, improve debugging efficiency, and bolster system reliability for guest access scenarios and postponed/advanced request handling.
April 2026
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for ydb-platform/nbs focusing on security, reliability, and observability. Delivered two high-impact changes that improve business value: enhanced guest access control through Filestore local service ACL propagation and stabilized request processing by fixing a throttler logging race condition. These efforts reduce security risks, improve debugging efficiency, and bolster system reliability for guest access scenarios and postponed/advanced request handling.
March 2026
4 Commits • 2 Features
Mar 1, 2026Concise monthly summary for 2026-03 focusing on delivering concrete features to improve file store reliability and configurability, and on strengthening test reliability and code quality. Key features delivered include documentation of the virtiofs to filestore-vhost communication path, and local filestore configuration enhancements with new flags and default client config. Major bug fix addressed fsync error propagation test reliability by ensuring invalid file descriptors are used to simulate errors. The combined work improves per-filesystem configurability, reliability of file synchronization, and provides clearer guidance for future maintenance. Technologies demonstrated include documentation, feature-flag based configuration, unit testing, and default config provisioning, with strong alignment to business value through stability and operability.
4 Commits • 2 Features
Mar 1, 2026Concise monthly summary for 2026-03 focusing on delivering concrete features to improve file store reliability and configurability, and on strengthening test reliability and code quality. Key features delivered include documentation of the virtiofs to filestore-vhost communication path, and local filestore configuration enhancements with new flags and default client config. Major bug fix addressed fsync error propagation test reliability by ensuring invalid file descriptors are used to simulate errors. The combined work improves per-filesystem configurability, reliability of file synchronization, and provides clearer guidance for future maintenance. Technologies demonstrated include documentation, feature-flag based configuration, unit testing, and default config provisioning, with strong alignment to business value through stability and operability.
March 2026
February 2026
7 Commits • 4 Features
Feb 1, 2026February 2026 (2026-02) — Key delivery across Filestore in ydb-platform/nbs focused on boosting concurrency, reliability, and data integrity under heavy workloads. The month delivered four major enhancements with measurable business value: higher throughput, lower tail latency, stronger data persistence guarantees, and more robust maintenance behavior.
February 2026
7 Commits • 4 Features
Feb 1, 2026February 2026 (2026-02) — Key delivery across Filestore in ydb-platform/nbs focused on boosting concurrency, reliability, and data integrity under heavy workloads. The month delivered four major enhancements with measurable business value: higher throughput, lower tail latency, stronger data persistence guarantees, and more robust maintenance behavior.
January 2026
4 Commits • 2 Features
Jan 1, 2026Month: 2026-01 | Repository: ydb-platform/nbs. Focused on stabilizing the Local Filestore, expanding snapshot management, and increasing test coverage for multiqueue processing. Deliverables are traceable to specific commits, enabling clear performance and quality reviews.
4 Commits • 2 Features
Jan 1, 2026Month: 2026-01 | Repository: ydb-platform/nbs. Focused on stabilizing the Local Filestore, expanding snapshot management, and increasing test coverage for multiqueue processing. Deliverables are traceable to specific commits, enabling clear performance and quality reviews.
January 2026
December 2025
3 Commits • 1 Features
Dec 1, 2025December 2025 (Month: 2025-12) – ydb-platform/nbs delivered storage configurability and reliability improvements that enable targeted performance tuning and safer concurrent operations for file storage workloads.
December 2025
3 Commits • 1 Features
Dec 1, 2025December 2025 (Month: 2025-12) – ydb-platform/nbs delivered storage configurability and reliability improvements that enable targeted performance tuning and safer concurrent operations for file storage workloads.
November 2025
9 Commits • 6 Features
Nov 1, 2025Monthly summary for 2025-11 (ydb-platform/nbs - Filestore). Focused on performance, reliability, and observability enhancements. Delivered configurable timeouts for dentry/attributes caches to tune performance and consistency; improved error propagation for fsync and EIO to surface actionable client errors; added FUSE_HANDLE_KILLPRIV_V2 support to boost write-path performance and security handling; introduced atomic versioning for XAttr operations (SetXAttr/GetXAttr) to strengthen cache correctness; propagated thread affinity to io_uring kernel workers to optimize I/O; and implemented rename efficiency improvements plus profiling log enhancements to reduce noise and improve visibility. These changes collectively improve end-user latency, reliability, and operator visibility, while demonstrating skills in Filestore internals, FUSE, io_uring, atomic versioning, and observability instrumentation.
9 Commits • 6 Features
Nov 1, 2025Monthly summary for 2025-11 (ydb-platform/nbs - Filestore). Focused on performance, reliability, and observability enhancements. Delivered configurable timeouts for dentry/attributes caches to tune performance and consistency; improved error propagation for fsync and EIO to surface actionable client errors; added FUSE_HANDLE_KILLPRIV_V2 support to boost write-path performance and security handling; introduced atomic versioning for XAttr operations (SetXAttr/GetXAttr) to strengthen cache correctness; propagated thread affinity to io_uring kernel workers to optimize I/O; and implemented rename efficiency improvements plus profiling log enhancements to reduce noise and improve visibility. These changes collectively improve end-user latency, reliability, and operator visibility, while demonstrating skills in Filestore internals, FUSE, io_uring, atomic versioning, and observability instrumentation.
November 2025
October 2025
2 Commits • 2 Features
Oct 1, 2025In October 2025, delivered two key enhancements in ydb-platform/nbs that improve observability and operational control over external storage mounts. External File System Mount Expiration Metrics introduces a new metric for reporting expiration times of external file system mounts, enabling better observability and lifecycle tracking of storage resources. Filestore: Configurable fsync queue control adds a configuration option to disable the fsync queue in filestore, giving operators more control over data synchronization during fsync operations. These changes were implemented with commits e93e62298c862ced14cfd9acafbd599a2c9f83fd ("[CSI] issue-4433: report fs mount expiration times in monitoring metrics (#4434)") and d6da74d121a52167d64a368a506c2b1456b8180a ("[Filestore] issue-4487: add config to disable fsync queue in filestore (#4488)"). The work aligns with the goals of improved observability, configurability, and reliability, enabling better resource governance and performance tuning. Overall, the month delivered measurable business value through enhanced monitoring capabilities and operational flexibility, with a clear path for SLA reporting and capacity planning.
October 2025
2 Commits • 2 Features
Oct 1, 2025In October 2025, delivered two key enhancements in ydb-platform/nbs that improve observability and operational control over external storage mounts. External File System Mount Expiration Metrics introduces a new metric for reporting expiration times of external file system mounts, enabling better observability and lifecycle tracking of storage resources. Filestore: Configurable fsync queue control adds a configuration option to disable the fsync queue in filestore, giving operators more control over data synchronization during fsync operations. These changes were implemented with commits e93e62298c862ced14cfd9acafbd599a2c9f83fd ("[CSI] issue-4433: report fs mount expiration times in monitoring metrics (#4434)") and d6da74d121a52167d64a368a506c2b1456b8180a ("[Filestore] issue-4487: add config to disable fsync queue in filestore (#4488)"). The work aligns with the goals of improved observability, configurability, and reliability, enabling better resource governance and performance tuning. Overall, the month delivered measurable business value through enhanced monitoring capabilities and operational flexibility, with a clear path for SLA reporting and capacity planning.
September 2025
1 Commits • 1 Features
Sep 1, 2025Month: 2025-09 — In ydb-platform/nbs, delivered Filestore Performance Tuning: Per-filesystem configuration for MaxBackground and MaxFuseLoopThreads. Introduced per-filesystem tuning to control background requests and fuse loop threads, improving performance isolation and throughput. Changes include protocol buffer definitions and configuration handling across components. Commit: e9daf2b7d051f6cb3f1eeb381d4ef3c88eb94430. Impact: provides finer-grained performance control, reduces contention, and supports scalable filestore workloads. No critical bugs reported this month; the work emphasizes performance optimization and configurability. Skills demonstrated include protocol buffers, multi-component configuration propagation, per-filesystem policy, and cross-repo integration.
1 Commits • 1 Features
Sep 1, 2025Month: 2025-09 — In ydb-platform/nbs, delivered Filestore Performance Tuning: Per-filesystem configuration for MaxBackground and MaxFuseLoopThreads. Introduced per-filesystem tuning to control background requests and fuse loop threads, improving performance isolation and throughput. Changes include protocol buffer definitions and configuration handling across components. Commit: e9daf2b7d051f6cb3f1eeb381d4ef3c88eb94430. Impact: provides finer-grained performance control, reduces contention, and supports scalable filestore workloads. No critical bugs reported this month; the work emphasizes performance optimization and configurability. Skills demonstrated include protocol buffers, multi-component configuration propagation, per-filesystem policy, and cross-repo integration.
September 2025
August 2025
6 Commits • 3 Features
Aug 1, 2025August 2025 (ydb-platform/nbs): Delivered targeted performance, reliability, and observability enhancements with a focus on business value and scalable growth. Key changes include multi-queue Filestore for higher throughput, robust concurrency correctness and test stability improvements, restored API compatibility for fuse_session_loop, configurable observability controls, and dynamic on-disk sizing for TPersistentTable. The work reduces latency under load, minimizes risk of data races and use-after-free issues, improves operational footprint, and enables more flexible resource management.
August 2025
6 Commits • 3 Features
Aug 1, 2025August 2025 (ydb-platform/nbs): Delivered targeted performance, reliability, and observability enhancements with a focus on business value and scalable growth. Key changes include multi-queue Filestore for higher throughput, robust concurrency correctness and test stability improvements, restored API compatibility for fuse_session_loop, configurable observability controls, and dynamic on-disk sizing for TPersistentTable. The work reduces latency under load, minimizes risk of data races and use-after-free issues, improves operational footprint, and enables more flexible resource management.
July 2025
5 Commits • 3 Features
Jul 1, 2025July 2025: Focused on improving filestore reliability, performance, and resource efficiency in ydb-platform/nbs. Delivered three major changes: (1) Filestore Permissions Handling Enhancement enabling atomic local filestore creation with trusted guest kernel permissions, (2) MaxBackground Concurrency configuration to tune throughput under load, and (3) Vhost-local File Store Endpoint Reuse to minimize redundant resource allocation and simplify queue tuning. Also fixed a test instability in ShouldStatFileStore. Result: stronger security/permissions model, improved scalability, and higher test reliability across the filestore stack.
5 Commits • 3 Features
Jul 1, 2025July 2025: Focused on improving filestore reliability, performance, and resource efficiency in ydb-platform/nbs. Delivered three major changes: (1) Filestore Permissions Handling Enhancement enabling atomic local filestore creation with trusted guest kernel permissions, (2) MaxBackground Concurrency configuration to tune throughput under load, and (3) Vhost-local File Store Endpoint Reuse to minimize redundant resource allocation and simplify queue tuning. Also fixed a test instability in ShouldStatFileStore. Result: stronger security/permissions model, improved scalability, and higher test reliability across the filestore stack.
July 2025
June 2025
6 Commits • 3 Features
Jun 1, 2025June 2025 Monthly Summary for ydb-platform/nbs: Focused on reliability, security, and observability improvements that reduce operational risk and improve debugging. Delivered five key items across Disk Manager, Filestore, and test stability, with measurable business impact.
June 2025
6 Commits • 3 Features
Jun 1, 2025June 2025 Monthly Summary for ydb-platform/nbs: Focused on reliability, security, and observability improvements that reduce operational risk and improve debugging. Delivered five key items across Disk Manager, Filestore, and test stability, with measurable business impact.
May 2025
6 Commits • 3 Features
May 1, 2025Monthly 2025-05 summary for repository ydb-platform/nbs. Delivered external filesystem support across the CSI Driver and Disk Manager, introduced filestore statistics (df) reporting and performance optimizations, and stabilized CI through targeted maintenance work, enabling faster, more reliable external FS workflows and observability.
6 Commits • 3 Features
May 1, 2025Monthly 2025-05 summary for repository ydb-platform/nbs. Delivered external filesystem support across the CSI Driver and Disk Manager, introduced filestore statistics (df) reporting and performance optimizations, and stabilized CI through targeted maintenance work, enabling faster, more reliable external FS workflows and observability.
May 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03) monthly summary for ydb-platform/nbs: Delivered two critical outcomes focused on feature delivery and reliability across filestore workflows. Key feature: VastNFS File System Support, including a new file ID type, inode high/low 32-bit ID parsing, a default file type for optimization, and extended ToString() to represent VastNFS IDs. Commit 6370b995531e098151a4ebf95b5a26fc9fa6ea71. Major fix: Robust gRPC timeout handling across storage clients, introducing a client-type parameter to IsGrpcTimeoutError so the correct StopEndpoint is invoked on timeout, improving stability across NBS/NFS scenarios. Commit 4f07900a3267820d14f743dd69f7104de000e08c. Overall impact: enables scalable VastNFS usage, reduces timeout-related outages, and enhances maintainability of filestore interactions. Technologies/skills: gRPC timeout handling, filesystem/inode ID design, ID stringification, and endpoint lifecycle management.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03) monthly summary for ydb-platform/nbs: Delivered two critical outcomes focused on feature delivery and reliability across filestore workflows. Key feature: VastNFS File System Support, including a new file ID type, inode high/low 32-bit ID parsing, a default file type for optimization, and extended ToString() to represent VastNFS IDs. Commit 6370b995531e098151a4ebf95b5a26fc9fa6ea71. Major fix: Robust gRPC timeout handling across storage clients, introducing a client-type parameter to IsGrpcTimeoutError so the correct StopEndpoint is invoked on timeout, improving stability across NBS/NFS scenarios. Commit 4f07900a3267820d14f743dd69f7104de000e08c. Overall impact: enables scalable VastNFS usage, reduces timeout-related outages, and enhances maintainability of filestore interactions. Technologies/skills: gRPC timeout handling, filesystem/inode ID design, ID stringification, and endpoint lifecycle management.
February 2025
5 Commits • 3 Features
Feb 1, 2025February 2025 contributions focused on strengthening the local filestore in ydb-platform/nbs through performance optimizations, robustness fixes, and configurable behavior. Key work includes implementing enhanced node cache management and loading, introducing zero-copy I/O, adding filestore configuration flags, and tightening POSIX compliance and test coverage. Unit test support was expanded to enable reliable CI, underpinning ongoing quality improvements across the filestore stack.
5 Commits • 3 Features
Feb 1, 2025February 2025 contributions focused on strengthening the local filestore in ydb-platform/nbs through performance optimizations, robustness fixes, and configurable behavior. Key work includes implementing enhanced node cache management and loading, introducing zero-copy I/O, adding filestore configuration flags, and tightening POSIX compliance and test coverage. Unit test support was expanded to enable reliable CI, underpinning ongoing quality improvements across the filestore stack.
February 2025
January 2025
8 Commits • 2 Features
Jan 1, 2025January 2025 (Month: 2025-01) – ydb-platform/nbs Filestore work delivered stability, reliability, and performance improvements through a focused set of bug fixes and new features. Key deliverables include robust filestore operations, configurable endpoint tuning, and multi-threaded I/O, complemented by CI/test reliability improvements. These changes reduce outage risk, improve throughput, and support scalability for production workloads while maintaining credentials safety.
January 2025
8 Commits • 2 Features
Jan 1, 2025January 2025 (Month: 2025-01) – ydb-platform/nbs Filestore work delivered stability, reliability, and performance improvements through a focused set of bug fixes and new features. Key deliverables include robust filestore operations, configurable endpoint tuning, and multi-threaded I/O, complemented by CI/test reliability improvements. These changes reduce outage risk, improve throughput, and support scalability for production workloads while maintaining credentials safety.
December 2024
5 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for ydb-platform/nbs: Delivered reliability and observability enhancements for the local filestore in multi-host deployments and equipped CI with debugging tooling, enabling faster issue diagnosis and more stable operations. The work improves cross-node consistency, read/write correctness under guest writeback caching, and provides richer profiling data for performance tuning. CI now includes GDB to surface stack traces in tests, accelerating triage and remediation.
5 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for ydb-platform/nbs: Delivered reliability and observability enhancements for the local filestore in multi-host deployments and equipped CI with debugging tooling, enabling faster issue diagnosis and more stable operations. The work improves cross-node consistency, read/write correctness under guest writeback caching, and provides richer profiling data for performance tuning. CI now includes GDB to surface stack traces in tests, accelerating triage and remediation.
December 2024
November 2024
9 Commits • 7 Features
Nov 1, 2024November 2024 highlights for ydb-platform/nbs: Delivered a set of performance, reliability, and developer productivity improvements across Filestore, FUSE, and testing tooling. Core features include Writeback Cache enablement across Filestore and FUSE to boost I/O throughput; a new Clear operation for the persistent table with Init refactor and unit tests; session-scoped local filestore index with unmount cleanup to improve stability; enhanced diagnostics tooling for robust process wait and backtrace on termination; and test infrastructure improvements to fix setup-db-test and rerun-db-load workflows with improved SSH handling and error logging. These changes, complemented by updates to active sessions visibility and local filesystem overrides, collectively boost performance, reliability, and developer efficiency across storage, session management, and test runs.
November 2024
9 Commits • 7 Features
Nov 1, 2024November 2024 highlights for ydb-platform/nbs: Delivered a set of performance, reliability, and developer productivity improvements across Filestore, FUSE, and testing tooling. Core features include Writeback Cache enablement across Filestore and FUSE to boost I/O throughput; a new Clear operation for the persistent table with Init refactor and unit tests; session-scoped local filestore index with unmount cleanup to improve stability; enhanced diagnostics tooling for robust process wait and backtrace on termination; and test infrastructure improvements to fix setup-db-test and rerun-db-load workflows with improved SSH handling and error logging. These changes, complemented by updates to active sessions visibility and local filesystem overrides, collectively boost performance, reliability, and developer efficiency across storage, session management, and test runs.
Activity
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Quality Metrics
Correctness90.6%
Maintainability85.0%
Architecture86.8%
Performance83.8%
AI Usage21.2%
Skills & Technologies
Programming Languages
CC++GoMarkdownProtoPythonShellYAMLgoprotobuf
Technical Skills
API DesignAsynchronous I/OAsynchronous ProgrammingBackend DevelopmentBug FixingBuild SystemsCC++C++ developmentCI/CDCSI Driver DevelopmentCache ManagementCachingCloud InfrastructureCode Style
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline