ydb-platform/nbs
Oct 2024 – May 2026
10 Months active
Languages Used
C++JSONMarkdownPythonprotobufBashExcalidrawSVG
Technical Skills
Algorithm OptimizationBackend DevelopmentCompactionData StructuresDistributed SystemsError Handling
Andrei Strelkovskii
PROFILE
Andrei Strelkovskii
Worked extensively on the ydb-platform/nbs repository, delivering robust distributed storage features focused on sharding, reliability, and observability. Developed scalable file system operations and cross-shard workflows, implementing enhancements such as dynamic shard management, directory sharding, and advanced telemetry. Applied C++ and Python to optimize backend performance, improve data integrity, and streamline API design. Addressed concurrency and race conditions through defensive programming and comprehensive unit testing, while introducing new CLI tools and metrics for operational visibility. The work emphasized incremental, traceable improvements, enabling safer deployments, faster diagnostics, and more predictable scaling for large-scale cloud storage environments and distributed systems.
Overall Statistics
Feature vs Bugs
55%Features
Repository Contributions
217Total
Bugs
67
Commits
217
Features
83
Lines of code
115,304
Activity Months10
Your Network
32 peopleWork History
May 2026
28 Commits • 11 Features
May 1, 2026May 2026: Focused on performance, reliability, and observability of the file-storage shard stack in ydb-platform/nbs. Key features were delivered to optimize storage for file data, enable pluggable shard backends, and improve monitoring and backpressure handling. Notable work spans dedicated file-only shards with IFileSystemShard integration, MemFileSystemShard with adapter integration and extensive tests, and preparatory NodeRefs caching enhancements. Telemetry and tracing were strengthened through tablet adapter metrics/traces and TabletProxy probes, alongside CPUUsageRate improvements. Backpressure for garbage collection was augmented to prevent stalls, contributing to more predictable throughput. This work reduces latency, increases throughput on large-scale file systems, and improves visibility for performance tuning and capacity planning.
28 Commits • 11 Features
May 1, 2026May 2026: Focused on performance, reliability, and observability of the file-storage shard stack in ydb-platform/nbs. Key features were delivered to optimize storage for file data, enable pluggable shard backends, and improve monitoring and backpressure handling. Notable work spans dedicated file-only shards with IFileSystemShard integration, MemFileSystemShard with adapter integration and extensive tests, and preparatory NodeRefs caching enhancements. Telemetry and tracing were strengthened through tablet adapter metrics/traces and TabletProxy probes, alongside CPUUsageRate improvements. Backpressure for garbage collection was augmented to prevent stalls, contributing to more predictable throughput. This work reduces latency, increases throughput on large-scale file systems, and improves visibility for performance tuning and capacity planning.
May 2026
April 2026
28 Commits • 15 Features
Apr 1, 2026April 2026 monthly summary (business value oriented): Delivered key scalability, reliability, and visibility improvements across the NBS platform, with a focus on operational metrics, safer maintenance workflows, and high-impact performance optimizations. The work reduces risk during maintenance, accelerates common operations (listings, storage stats), and enhances capacity planning insights while maintaining feature parity and stability across filesystems and shard groups.
April 2026
28 Commits • 15 Features
Apr 1, 2026April 2026 monthly summary (business value oriented): Delivered key scalability, reliability, and visibility improvements across the NBS platform, with a focus on operational metrics, safer maintenance workflows, and high-impact performance optimizations. The work reduces risk during maintenance, accelerates common operations (listings, storage stats), and enhances capacity planning insights while maintaining feature parity and stability across filesystems and shard groups.
March 2026
26 Commits • 6 Features
Mar 1, 2026March 2026 (2026-03) focused on stability, performance, and developer experience in filestore and directory/shard features. Delivered low-overhead file store mode, improved correctness for node-attribute handling, enhanced dirViewer with file-name hashing and client test alignment, and strengthened shard-related operations with crash fixes and benchmarks. Expanded benchmarking and validation for directories in shards, added benchmark utilities, and improved public API consistency through error translation. The work reduces operational risk, lowers per-request overhead, and provides measurable performance visibility for hot paths in filestore and directory operations.
26 Commits • 6 Features
Mar 1, 2026March 2026 (2026-03) focused on stability, performance, and developer experience in filestore and directory/shard features. Delivered low-overhead file store mode, improved correctness for node-attribute handling, enhanced dirViewer with file-name hashing and client test alignment, and strengthened shard-related operations with crash fixes and benchmarks. Expanded benchmarking and validation for directories in shards, added benchmark utilities, and improved public API consistency through error translation. The work reduces operational risk, lowers per-request overhead, and provides measurable performance visibility for hot paths in filestore and directory operations.
March 2026
February 2026
22 Commits • 8 Features
Feb 1, 2026February 2026: Delivered substantial telemetry, reliability, and API hygiene improvements in ydb-platform/nbs. Implemented extensive tablet metrics for TEvIndexTablet flows, enhanced RenameNode idempotency with a dedicated ResponseLog, fixed critical tablet race conditions (CommitIdOverflow and in-flight tracking), strengthened tests/build processes, and introduced API-related improvements (UnsafeCreateNode and MainTabletId in GetFileStoreInfo) to improve observability, recoverability, and operational resilience across sharded deployments.
February 2026
22 Commits • 8 Features
Feb 1, 2026February 2026: Delivered substantial telemetry, reliability, and API hygiene improvements in ydb-platform/nbs. Implemented extensive tablet metrics for TEvIndexTablet flows, enhanced RenameNode idempotency with a dedicated ResponseLog, fixed critical tablet race conditions (CommitIdOverflow and in-flight tracking), strengthened tests/build processes, and introduced API-related improvements (UnsafeCreateNode and MainTabletId in GetFileStoreInfo) to improve observability, recoverability, and operational resilience across sharded deployments.
January 2026
23 Commits • 9 Features
Jan 1, 2026January 2026: Consolidated gains across Filestore, storage service, and cross‑shard workflows with a strong emphasis on reliability, observability, and performance. Key features delivered include Filestore client-id logging and CLI support for --client-id, two-stage-read for overloaded tablets, and a new Tablet-level OverloadedCount metric, enabling better load shedding decisions and actionable metrics. We also shipped extensive tests and API work to support complex cross‑shard operations under DirectoryCreationInShardsEnabled, including Prepare/AbortUnlinkDirectoryNodeInShard APIs, directory emptiness checks, and related RenameNodeInDestination workflows. Major bug fixes and stability improvements include isolating InFlightRequest handling (CompleteAndErase) to reduce back-pressure on the storage layer, TReadDataActor InFlightRequest self-management, CommitIdOverflow race fixes across RenameNode paths, and profile-log ordering/finalization fixes to ensure accurate diagnostics. We also resolved racey shard selection for hardlink creation under DirectoryCreationInShardsEnabled and introduced safer node-ref operations (UnsafeNodeRef APIs) to support tests and diagnostics. Overall impact: significantly improved performance, reliability, and diagnosability in filestore and NBS services, with better overload handling, deterministic testing paths, and deeper observability. The work enables safer cross‑shard operations, faster root-cause analysis, and a foundation for further optimization. Technologies/skills demonstrated: concurrency and synchronization (THashMap, TAdaptiveLock), cross-service transactions, private API design for testing, extensive unit/integration testing, performance profiling and diagnostics, and enhanced reporting (JUnit HTML links) for better visibility into test results and failures.
23 Commits • 9 Features
Jan 1, 2026January 2026: Consolidated gains across Filestore, storage service, and cross‑shard workflows with a strong emphasis on reliability, observability, and performance. Key features delivered include Filestore client-id logging and CLI support for --client-id, two-stage-read for overloaded tablets, and a new Tablet-level OverloadedCount metric, enabling better load shedding decisions and actionable metrics. We also shipped extensive tests and API work to support complex cross‑shard operations under DirectoryCreationInShardsEnabled, including Prepare/AbortUnlinkDirectoryNodeInShard APIs, directory emptiness checks, and related RenameNodeInDestination workflows. Major bug fixes and stability improvements include isolating InFlightRequest handling (CompleteAndErase) to reduce back-pressure on the storage layer, TReadDataActor InFlightRequest self-management, CommitIdOverflow race fixes across RenameNode paths, and profile-log ordering/finalization fixes to ensure accurate diagnostics. We also resolved racey shard selection for hardlink creation under DirectoryCreationInShardsEnabled and introduced safer node-ref operations (UnsafeNodeRef APIs) to support tests and diagnostics. Overall impact: significantly improved performance, reliability, and diagnosability in filestore and NBS services, with better overload handling, deterministic testing paths, and deeper observability. The work enables safer cross‑shard operations, faster root-cause analysis, and a foundation for further optimization. Technologies/skills demonstrated: concurrency and synchronization (THashMap, TAdaptiveLock), cross-service transactions, private API design for testing, extensive unit/integration testing, performance profiling and diagnostics, and enhanced reporting (JUnit HTML links) for better visibility into test results and failures.
January 2026
December 2025
26 Commits • 10 Features
Dec 1, 2025December 2025 monthly summary: Focused on observability, reliability, and performance across the storage stack (tablet, service, filestore). Delivered concrete business value through advanced profiling, end-to-end tracing, and data-integrity fixes, enabling faster diagnostics, safer operations, and better capacity planning.
December 2025
26 Commits • 10 Features
Dec 1, 2025December 2025 monthly summary: Focused on observability, reliability, and performance across the storage stack (tablet, service, filestore). Delivered concrete business value through advanced profiling, end-to-end tracing, and data-integrity fixes, enabling faster diagnostics, safer operations, and better capacity planning.
January 2025
15 Commits • 10 Features
Jan 1, 2025January 2025 consolidated a core set of sharding enhancements, reliability fixes, and tooling improvements for ydb-platform/nbs. The month focused on enabling safe cross-shard operations, scalable storage management, and accelerated testing through new commands and integration-oriented changes, while strengthening data consistency and observability across the distributed filesystem.
15 Commits • 10 Features
Jan 1, 2025January 2025 consolidated a core set of sharding enhancements, reliability fixes, and tooling improvements for ydb-platform/nbs. The month focused on enabling safe cross-shard operations, scalable storage management, and accelerated testing through new commands and integration-oriented changes, while strengthening data consistency and observability across the distributed filesystem.
January 2025
December 2024
26 Commits • 7 Features
Dec 1, 2024December 2024 (2024-12) monthly summary for ydb-platform/nbs focused on safety, scalability, and observability in shard management and filestore sharding. Delivered key safety defaults for shard configuration, flexible deployment controls, expanded shard management capabilities, and enhanced visibility into storage usage. These changes reduce deployment risk, improve scaling for large-scale workloads, and provide clearer metrics for operators and developers.
December 2024
26 Commits • 7 Features
Dec 1, 2024December 2024 (2024-12) monthly summary for ydb-platform/nbs focused on safety, scalability, and observability in shard management and filestore sharding. Delivered key safety defaults for shard configuration, flexible deployment controls, expanded shard management capabilities, and enhanced visibility into storage usage. These changes reduce deployment risk, improve scaling for large-scale workloads, and provide clearer metrics for operators and developers.
November 2024
20 Commits • 6 Features
Nov 1, 2024November 2024 monthly summary for ydb-platform/nbs focusing on delivering cross-replica data integrity, scalable filestore shard management, and reliability improvements, with instrumentation and documentation enhancements to support operations and future work.
20 Commits • 6 Features
Nov 1, 2024November 2024 monthly summary for ydb-platform/nbs focusing on delivering cross-replica data integrity, scalable filestore shard management, and reliability improvements, with instrumentation and documentation enhancements to support operations and future work.
November 2024
October 2024
3 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — This period focused on reliability and robustness improvements in the storage workflow of ydb-platform/nbs, delivering concrete features and hardening bugs to improve stability, throughput, and deployment confidence. The changes emphasize business value by reducing operational risk in data processing pipelines and ensuring predictable storage behavior under restart and heavy load. Summary of impact: - Increased reliability and efficiency of compaction workflows; better handling of tablet restarts during forced filestore compaction, retrying aborted operations using the last processed range ID, and refining CompactRange to avoid skipping ranges with zero used blocks; blob counting is consolidated so all MixedBlobs from a single compaction run count as a single logical blob, reducing extraneous compactions. - Hardened blockstore volume operations with stricter parameter validation (Disk ID and Config Version) and a boolean conversion operator for volume parameters to simplify presence checks and prevent misconfigurations. - Clear traceability to issues (#2392, #2395, #2396) and commits that address these concerns, reflecting disciplined incremental engineering. Technologies/skills demonstrated: - Deep storage internals knowledge (filestore, compaction, blockstore) - Defensive programming and parameter validation - Stateful retry logic and correctness in edge cases (tablet restarts, zero-used blocks) - Maintained code quality and traceability through precise commit messages and issue linkage.
October 2024
3 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — This period focused on reliability and robustness improvements in the storage workflow of ydb-platform/nbs, delivering concrete features and hardening bugs to improve stability, throughput, and deployment confidence. The changes emphasize business value by reducing operational risk in data processing pipelines and ensuring predictable storage behavior under restart and heavy load. Summary of impact: - Increased reliability and efficiency of compaction workflows; better handling of tablet restarts during forced filestore compaction, retrying aborted operations using the last processed range ID, and refining CompactRange to avoid skipping ranges with zero used blocks; blob counting is consolidated so all MixedBlobs from a single compaction run count as a single logical blob, reducing extraneous compactions. - Hardened blockstore volume operations with stricter parameter validation (Disk ID and Config Version) and a boolean conversion operator for volume parameters to simplify presence checks and prevent misconfigurations. - Clear traceability to issues (#2392, #2395, #2396) and commits that address these concerns, reflecting disciplined incremental engineering. Technologies/skills demonstrated: - Deep storage internals knowledge (filestore, compaction, blockstore) - Defensive programming and parameter validation - Stateful retry logic and correctness in edge cases (tablet restarts, zero-used blocks) - Maintained code quality and traceability through precise commit messages and issue linkage.
Activity
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Quality Metrics
Correctness91.4%
Maintainability84.4%
Architecture85.8%
Performance83.6%
AI Usage24.4%
Skills & Technologies
Programming Languages
BashCC++CSSExcalidrawGoHTMLJSONJavaScriptMakefile
Technical Skills
API DesignAPI DevelopmentAPI designAPI developmentAPI integrationAlgorithm OptimizationArchitectureBackend DevelopmentBenchmarkingBuild system managementC programmingC++C++ DevelopmentC++ ProgrammingC++ development
Repositories Contributed To
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