ydb-platform/nbs
Oct 2024 – May 2026
20 Months active
Languages Used
C++BashGoProtoProtocol BuffersPythonprotobufcpp
Technical Skills
Backend DevelopmentC++Distributed SystemsError HandlingStorage SystemsSystem Design
Pavel Misko
PROFILE
Pavel Misko
Over 20 months, contributed to ydb-platform/nbs by engineering robust storage and device management features with a focus on reliability, security, and operational efficiency. Developed and maintained APIs for block storage, local NVMe device lifecycle, and encryption workflows, leveraging C++, Go, and Python. Enhanced system resilience through NUMA-aware scheduling, error handling, and test infrastructure improvements, while integrating cloud services and gRPC interfaces for cross-language support. Addressed complex concurrency and performance challenges, refactored core modules for maintainability, and expanded observability with detailed metrics and logging. The work enabled scalable, secure storage operations and streamlined integration for external clients and SDKs.
Overall Statistics
Feature vs Bugs
68%Features
Repository Contributions
140Total
Bugs
25
Commits
140
Features
53
Lines of code
31,963
Activity Months20
Your Network
32 peopleWork History
May 2026
5 Commits • 3 Features
May 1, 2026Month: 2026-05 | Repository: ydb-platform/nbs Key features delivered: - NUMA-aware NVMe resource management: Added support for NUMA node configuration for NVMe devices, enabling retrieval and display of NUMA information to optimize memory access patterns on NUMA systems. - Local NVMe service accessibility and robustness improvements: Exposed a public API for the Local NVMe service via Unix Domain Sockets and improved NVMe device acquisition by resolving vfio-dev and returning the NVMe device description to SDK users, including retry logic. - Verify-test tooling enhancements: Added a logging mechanism to verify-test and refactored concurrency constructs to improve diagnostics, debugging capabilities, and thread safety. Major bugs fixed / stability enhancements: - Fixed SDK integration by ensuring AcquireNVMeDevice returns the NVMe device object (improves SDK reliability and eliminates null/device-descriptor gaps). - Improved NVMe device acquisition flow to resolve vfio-dev at the correct stage, reducing race conditions and acquisition failures. Overall impact and accomplishments: - Improved system-wide NVMe resource awareness and NUMA-aware scheduling, leading to better memory locality and performance on multi-socket servers. - More reliable Local NVMe service usage for SDK consumers, with a public API and robust device acquisition pathways. - Enhanced observability and reliability of tests and diagnostics through verified-test logging and safer concurrency semantics. Technologies / skills demonstrated: - NUMA topology handling, Unix Domain Sockets public API exposure, VFIO-pci device management, retry/error handling patterns, concurrency safety, and logging instrumentation.
5 Commits • 3 Features
May 1, 2026Month: 2026-05 | Repository: ydb-platform/nbs Key features delivered: - NUMA-aware NVMe resource management: Added support for NUMA node configuration for NVMe devices, enabling retrieval and display of NUMA information to optimize memory access patterns on NUMA systems. - Local NVMe service accessibility and robustness improvements: Exposed a public API for the Local NVMe service via Unix Domain Sockets and improved NVMe device acquisition by resolving vfio-dev and returning the NVMe device description to SDK users, including retry logic. - Verify-test tooling enhancements: Added a logging mechanism to verify-test and refactored concurrency constructs to improve diagnostics, debugging capabilities, and thread safety. Major bugs fixed / stability enhancements: - Fixed SDK integration by ensuring AcquireNVMeDevice returns the NVMe device object (improves SDK reliability and eliminates null/device-descriptor gaps). - Improved NVMe device acquisition flow to resolve vfio-dev at the correct stage, reducing race conditions and acquisition failures. Overall impact and accomplishments: - Improved system-wide NVMe resource awareness and NUMA-aware scheduling, leading to better memory locality and performance on multi-socket servers. - More reliable Local NVMe service usage for SDK consumers, with a public API and robust device acquisition pathways. - Enhanced observability and reliability of tests and diagnostics through verified-test logging and safer concurrency semantics. Technologies / skills demonstrated: - NUMA topology handling, Unix Domain Sockets public API exposure, VFIO-pci device management, retry/error handling patterns, concurrency safety, and logging instrumentation.
May 2026
April 2026
6 Commits • 2 Features
Apr 1, 2026April 2026 — Key contributions in ydb-platform/nbs focused on observability, disk introspection, and test reliability. Delivered DiskRegistry observability metrics (TabletGeneration, DisksToCleanup), added DiskRegistryDescribeDisk action for detailed disk insights, and reinforced gRPC shutdown test infrastructure with a dedicated module and null logging backend, reducing teardown-related flakiness and improving release confidence.
April 2026
6 Commits • 2 Features
Apr 1, 2026April 2026 — Key contributions in ydb-platform/nbs focused on observability, disk introspection, and test reliability. Delivered DiskRegistry observability metrics (TabletGeneration, DisksToCleanup), added DiskRegistryDescribeDisk action for detailed disk insights, and reinforced gRPC shutdown test infrastructure with a dedicated module and null logging backend, reducing teardown-related flakiness and improving release confidence.
March 2026
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for ydb-platform/nbs: Delivered a new public gRPC API for local NVMe device management on TBlockStoreService, enabling list/acquire/release operations over RPC. This included new local_nvme.proto, TNVMeDeviceDesc, and TLocalNVMeServiceProxy, with internal protos moved to libs/local_nvme/protos. Updated Go SDK, Python SDK, and CSI driver mocks to expose the new API; added authentication control and unit/integration tests for the proxy and SDK clients. In parallel, improved test reliability by refactoring TestDiscoveryClientCachedBalancers to use atomic counters for pings/requests, and added disk_agent as a required build dependency for rdma_test to ensure correctness in environments that require it. These changes enhance operability, reliability, and cross-language support, enabling clients to manage NVMe devices over RPC and providing a more stable CI baseline.
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for ydb-platform/nbs: Delivered a new public gRPC API for local NVMe device management on TBlockStoreService, enabling list/acquire/release operations over RPC. This included new local_nvme.proto, TNVMeDeviceDesc, and TLocalNVMeServiceProxy, with internal protos moved to libs/local_nvme/protos. Updated Go SDK, Python SDK, and CSI driver mocks to expose the new API; added authentication control and unit/integration tests for the proxy and SDK clients. In parallel, improved test reliability by refactoring TestDiscoveryClientCachedBalancers to use atomic counters for pings/requests, and added disk_agent as a required build dependency for rdma_test to ensure correctness in environments that require it. These changes enhance operability, reliability, and cross-language support, enabling clients to manage NVMe devices over RPC and providing a more stable CI baseline.
March 2026
February 2026
17 Commits • 3 Features
Feb 1, 2026February 2026 monthly summary for ydb-platform/nbs focused on delivering end-to-end local NVMe device management, enabling external inventory provisioning, and strengthening reliability/testing. The work created from a foundation of automated lifecycle management for local NVMe devices, coupled with external inventory integration and improved build stability, driving tangible business value in operations and deployment confidence.
February 2026
17 Commits • 3 Features
Feb 1, 2026February 2026 monthly summary for ydb-platform/nbs focused on delivering end-to-end local NVMe device management, enabling external inventory provisioning, and strengthening reliability/testing. The work created from a foundation of automated lifecycle management for local NVMe devices, coupled with external inventory integration and improved build stability, driving tangible business value in operations and deployment confidence.
January 2026
3 Commits • 1 Features
Jan 1, 2026January 2026: Delivered foundational Local NVMe device management in ydb-platform/nbs and stabilized system behavior for zombie state transitions. The work enables external clients (e.g., Kubernetes device plugins) to discover, acquire, and release local NVMe devices, with configurable loading of device lists and CLI/config support. Also fixed a stability issue in TMirrorPartitionActor by ignoring TEvRangeResynced during zombie transitions, reducing unnecessary processing.
3 Commits • 1 Features
Jan 1, 2026January 2026: Delivered foundational Local NVMe device management in ydb-platform/nbs and stabilized system behavior for zombie state transitions. The work enables external clients (e.g., Kubernetes device plugins) to discover, acquire, and release local NVMe devices, with configurable loading of device lists and CLI/config support. Also fixed a stability issue in TMirrorPartitionActor by ignoring TEvRangeResynced during zombie transitions, reducing unnecessary processing.
January 2026
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for ydb-platform/nbs. Focused on improving encryption mode clarity by standardizing the Root KMS usage naming, updating configurations and tests to reflect the new mode. Delivered a key feature that renames ENCRYPTION_AT_REST to ENCRYPTION_WITH_ROOT_KMS_PROVIDED_KEY and ensures all related tests are aligned. Also updated Disk Manager test references to RootKmsEncryptionForDiskRegistryBasedDisks for encrypted folders to prevent regressions. No production bugs fixed this month; primary work was feature naming clarity and test alignment which enhances maintainability and reduces misconfiguration risk.
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for ydb-platform/nbs. Focused on improving encryption mode clarity by standardizing the Root KMS usage naming, updating configurations and tests to reflect the new mode. Delivered a key feature that renames ENCRYPTION_AT_REST to ENCRYPTION_WITH_ROOT_KMS_PROVIDED_KEY and ensures all related tests are aligned. Also updated Disk Manager test references to RootKmsEncryptionForDiskRegistryBasedDisks for encrypted folders to prevent regressions. No production bugs fixed this month; primary work was feature naming clarity and test alignment which enhances maintainability and reduces misconfiguration risk.
November 2025
3 Commits • 1 Features
Nov 1, 2025Month 2025-11 focused on strengthening disk resource allocation reliability and efficiency in ydb-platform/nbs, delivering policy-driven scheduling enhancements and robust I/O error handling. The work improved capacity utilization, safer migrations, and resilience against non-fatal I/O errors, thereby reducing operational risk and improving scheduling predictability for disk devices.
3 Commits • 1 Features
Nov 1, 2025Month 2025-11 focused on strengthening disk resource allocation reliability and efficiency in ydb-platform/nbs, delivering policy-driven scheduling enhancements and robust I/O error handling. The work improved capacity utilization, safer migrations, and resilience against non-fatal I/O errors, thereby reducing operational risk and improving scheduling predictability for disk devices.
November 2025
October 2025
3 Commits • 1 Features
Oct 1, 2025October 2025: Delivered CI Test Environment Optimization for ydb-platform/nbs by adopting tmpfs-backed tests, ensuring robust RAM-disk setup via YA_RAM_DRIVE_PATH and stabilizing IO behavior by disabling O_DIRECT/O_SYNC for tmpfs tests. The work, implemented through three commits, improved CI performance and reliability for the NBS repository.
October 2025
3 Commits • 1 Features
Oct 1, 2025October 2025: Delivered CI Test Environment Optimization for ydb-platform/nbs by adopting tmpfs-backed tests, ensuring robust RAM-disk setup via YA_RAM_DRIVE_PATH and stabilizing IO behavior by disabling O_DIRECT/O_SYNC for tmpfs tests. The work, implemented through three commits, improved CI performance and reliability for the NBS repository.
September 2025
10 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for ydb-platform/nbs: Delivered key disk-management features, enhanced test reliability, and improved observability, driving faster debugging, stable deployments, and improved system reliability. Strengthened API consistency and security integrations to support business-scale usage.
10 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for ydb-platform/nbs: Delivered key disk-management features, enhanced test reliability, and improved observability, driving faster debugging, stable deployments, and improved system reliability. Strengthened API consistency and security integrations to support business-scale usage.
September 2025
August 2025
13 Commits • 6 Features
Aug 1, 2025Summary for 2025-08: The month focused on improving storage resilience, bootstrapping, test infrastructure, and CI efficiency in ydb-platform/nbs. Key outcomes include robust handling of device loss in Blockstore with tests; simplified bootstrapping via default service factories; enhanced disk session resilience and testing utilities; CI/test configuration and IO optimizations for faster and more reliable pipelines; extended observability with block-range event log filtering and added API to retrieve disk states. These changes improve data integrity, startup resilience, test isolation, and developer productivity while enabling faster iteration on storage features.
August 2025
13 Commits • 6 Features
Aug 1, 2025Summary for 2025-08: The month focused on improving storage resilience, bootstrapping, test infrastructure, and CI efficiency in ydb-platform/nbs. Key outcomes include robust handling of device loss in Blockstore with tests; simplified bootstrapping via default service factories; enhanced disk session resilience and testing utilities; CI/test configuration and IO optimizations for faster and more reliable pipelines; extended observability with block-range event log filtering and added API to retrieve disk states. These changes improve data integrity, startup resilience, test isolation, and developer productivity while enabling faster iteration on storage features.
July 2025
25 Commits • 8 Features
Jul 1, 2025July 2025 — Focused on stabilizing IO paths, enabling scalable backends, and aligning storage primitives with forward-looking architecture. Delivered foundational IO-uring based services, IO adapters, and storage-provider renames; addressed critical memory leaks and configuration edge cases; expanded test coverage for filestore and io_uring scenarios; and prepared the ground for higher throughput and easier backend evolution.
25 Commits • 8 Features
Jul 1, 2025July 2025 — Focused on stabilizing IO paths, enabling scalable backends, and aligning storage primitives with forward-looking architecture. Delivered foundational IO-uring based services, IO adapters, and storage-provider renames; addressed critical memory leaks and configuration edge cases; expanded test coverage for filestore and io_uring scenarios; and prepared the ground for higher throughput and easier backend evolution.
July 2025
June 2025
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for ydb-platform/nbs focused on reliability, developer usability, and operational stability. Delivered three targeted improvements that reduce runtime overhead, improve debugging, and enable more predictable service behavior. The changes emphasize business value by reducing unnecessary work, speeding issue diagnosis, and tightening shutdown paths in production services.
June 2025
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for ydb-platform/nbs focused on reliability, developer usability, and operational stability. Delivered three targeted improvements that reduce runtime overhead, improve debugging, and enable more predictable service behavior. The changes emphasize business value by reducing unnecessary work, speeding issue diagnosis, and tightening shutdown paths in production services.
May 2025
5 Commits • 2 Features
May 1, 2025Monthly summary for 2025-05 focused on ydb-platform/nbs: Delivered key features and fixed critical reliability bugs, with a clear boost in observability and shutdown safety. Business value centers on improved latency accuracy, richer telemetry, and safer graceful shutdowns, enabling faster issue diagnosis and lower incident risk.
5 Commits • 2 Features
May 1, 2025Monthly summary for 2025-05 focused on ydb-platform/nbs: Delivered key features and fixed critical reliability bugs, with a clear boost in observability and shutdown safety. Business value centers on improved latency accuracy, richer telemetry, and safer graceful shutdowns, enabling faster issue diagnosis and lower incident risk.
May 2025
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for ydb-platform/nbs focused on strengthening security robustness and expanding test coverage in the RDMA path. Key work included a security-focused refactor of the encryption key management to simplify key handling and reduce failure modes, plus a comprehensive enhancement to RDMA testing infrastructure and storage naming alignment. The changes improve reliability, reduce risk from misconfigurations, and broaden validation coverage ahead of release.
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for ydb-platform/nbs focused on strengthening security robustness and expanding test coverage in the RDMA path. Key work included a security-focused refactor of the encryption key management to simplify key handling and reduce failure modes, plus a comprehensive enhancement to RDMA testing infrastructure and storage naming alignment. The changes improve reliability, reduce risk from misconfigurations, and broaden validation coverage ahead of release.
March 2025
10 Commits • 4 Features
Mar 1, 2025March 2025 (ydb-platform/nbs) monthly summary focusing on reliability, security, and developer productivity. Delivered key features, fixed critical test harness issues, expanded migration framework, and strengthened test infrastructure with a Fake RDMA client. These efforts improve stability in KMS integration, migration flows, and volume encryption capabilities, while enhancing test coverage and operation efficiency.
10 Commits • 4 Features
Mar 1, 2025March 2025 (ydb-platform/nbs) monthly summary focusing on reliability, security, and developer productivity. Delivered key features, fixed critical test harness issues, expanded migration framework, and strengthened test infrastructure with a Fake RDMA client. These efforts improve stability in KMS integration, migration flows, and volume encryption capabilities, while enhancing test coverage and operation efficiency.
March 2025
February 2025
5 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for ydb-platform/nbs: highlights include security, reliability, and resiliency improvements across the block storage subsystem. Implemented Encryption at Rest Mode, fixed gRPC shutdown race condition with added thread-safe shutdown test, enforced correct behavior for encrypted overlay disks with explicit error handling and unit tests, and hardened volume actor state handling by ignoring TEvAcquireDiskIfNeeded in zombie state to prevent invalid disk acquisitions. These changes enhance data protection, stability during shutdown, and operational correctness, delivering measurable business value and reducing risk in production.
February 2025
5 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for ydb-platform/nbs: highlights include security, reliability, and resiliency improvements across the block storage subsystem. Implemented Encryption at Rest Mode, fixed gRPC shutdown race condition with added thread-safe shutdown test, enforced correct behavior for encrypted overlay disks with explicit error handling and unit tests, and hardened volume actor state handling by ignoring TEvAcquireDiskIfNeeded in zombie state to prevent invalid disk acquisitions. These changes enhance data protection, stability during shutdown, and operational correctness, delivering measurable business value and reducing risk in production.
January 2025
4 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for ydb-platform/nbs. Delivered core platform enhancements focused on disk IO pipeline robustness, encrypted volume usage tracking, and test infrastructure reliability. These changes improve resilience to unknown devices, reduce test flakiness, and provide more accurate storage operation metrics, strengthening production readiness and maintainability.
4 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for ydb-platform/nbs. Delivered core platform enhancements focused on disk IO pipeline robustness, encrypted volume usage tracking, and test infrastructure reliability. These changes improve resilience to unknown devices, reduce test flakiness, and provide more accurate storage operation metrics, strengthening production readiness and maintainability.
January 2025
December 2024
9 Commits • 4 Features
Dec 1, 2024For December 2024, this month delivered major enhancements to the Blockstore (NBS) within ydb-platform, focusing on security, reliability, and performance improvements. Key features include disk encryption at rest with KMS integration, robust blockstore configuration management, and system health monitoring enhancements. In addition, internal performance and test infrastructure were upgraded to improve test reliability and execution efficiency. These efforts collectively reduce risk, improve regulatory compliance, and accelerate operational throughput.
December 2024
9 Commits • 4 Features
Dec 1, 2024For December 2024, this month delivered major enhancements to the Blockstore (NBS) within ydb-platform, focusing on security, reliability, and performance improvements. Key features include disk encryption at rest with KMS integration, robust blockstore configuration management, and system health monitoring enhancements. In addition, internal performance and test infrastructure were upgraded to improve test reliability and execution efficiency. These efforts collectively reduce risk, improve regulatory compliance, and accelerate operational throughput.
November 2024
9 Commits • 4 Features
Nov 1, 2024November 2024: Focused on reliability, security, and scalable disk management in the ydb-platform/nbs repository. Delivered core Disk Device Configuration Management with serial-number awareness, enhanced Disk Registry reliability via IO control and per-folder access rules, and established Root KMS integration with a provider/client pattern and testing harness. Resolved critical shutdown and logging stability issues to improve production operability. Built a foundation for secure DEK management via remote KMS and added a dedicated KMS testing infrastructure to enable isolated, TLS-enabled testing. This combination reduces risk, improves configuration correctness, and enables enterprise-grade security workflows.
9 Commits • 4 Features
Nov 1, 2024November 2024: Focused on reliability, security, and scalable disk management in the ydb-platform/nbs repository. Delivered core Disk Device Configuration Management with serial-number awareness, enhanced Disk Registry reliability via IO control and per-folder access rules, and established Root KMS integration with a provider/client pattern and testing harness. Resolved critical shutdown and logging stability issues to improve production operability. Built a foundation for secure DEK management via remote KMS and added a dedicated KMS testing infrastructure to enable isolated, TLS-enabled testing. This combination reduces risk, improves configuration correctness, and enables enterprise-grade security workflows.
November 2024
October 2024
2 Commits • 1 Features
Oct 1, 20242024-10 Monthly Summary – Focused delivery on API clarity and volume-update resilience in ydb-platform/nbs. Key features delivered and bugs fixed: 1) Agent Registration API Return Value Structure Update (Feature): Refactored agent registration to return affected and reallocated disks as a structured value; updated downstream callers to handle the new return type, improving clarity, integration, and on-boarding workflows. 2) Blockstore Volume Configuration Update Retry and State Persistence (Bug): Introduced robust error handling for retriable disk allocation failures during volume config updates; added retry scheduling and a mechanism to save/restore the state of unfinished updates to prevent data loss and ensure configuration consistency. Impact and Accomplishments: - Increased API clarity and integration reliability for agent onboarding. - Hardened volume/config update flows against partial failures, reducing data loss risk and promoting system resilience. - Better traceability with linked commits and issue references for accountability. Technologies/Skills Demonstrated: - Go-based API design and struct-based return values - Robust error handling and retry semantics - State persistence for long-running updates - Clear change traceability to issues (#2074, #2370)
October 2024
2 Commits • 1 Features
Oct 1, 20242024-10 Monthly Summary – Focused delivery on API clarity and volume-update resilience in ydb-platform/nbs. Key features delivered and bugs fixed: 1) Agent Registration API Return Value Structure Update (Feature): Refactored agent registration to return affected and reallocated disks as a structured value; updated downstream callers to handle the new return type, improving clarity, integration, and on-boarding workflows. 2) Blockstore Volume Configuration Update Retry and State Persistence (Bug): Introduced robust error handling for retriable disk allocation failures during volume config updates; added retry scheduling and a mechanism to save/restore the state of unfinished updates to prevent data loss and ensure configuration consistency. Impact and Accomplishments: - Increased API clarity and integration reliability for agent onboarding. - Hardened volume/config update flows against partial failures, reducing data loss risk and promoting system resilience. - Better traceability with linked commits and issue references for accountability. Technologies/Skills Demonstrated: - Go-based API design and struct-based return values - Robust error handling and retry semantics - State persistence for long-running updates - Clear change traceability to issues (#2074, #2370)
Activity
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Quality Metrics
Correctness91.0%
Maintainability88.6%
Architecture86.8%
Performance82.8%
AI Usage21.8%
Skills & Technologies
Programming Languages
BashC++GoMakefileMarkdownProtoProtoBufProtocol BuffersPythonShell
Technical Skills
API DesignAPI DevelopmentAPI developmentActor ModelAsynchronous I/OAsynchronous ProgrammingAuthenticationBackend DevelopmentBlock StorageBuild SystemsC++C++ DevelopmentC++ developmentCI/CDCaching
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