eBay/HomeStore
Nov 2024 – Feb 2026
10 Months active
Languages Used
C++CMakePython
Technical Skills
Build System ConfigurationC++Distributed SystemsPythonReplicationTesting
Sanal
PROFILE
Sanal
San Pillai contributed to the eBay/HomeStore repository by engineering core storage and replication features focused on reliability, performance, and scalability. Over ten months, he enhanced log management, implemented asynchronous I/O and batching APIs, and introduced memory management improvements using C++ and Python. His work included developing checkpointing reliability mechanisms, optimizing Raft replication latency, and adding configurable resource controls for index tables. He addressed concurrency and data integrity issues through disciplined locking strategies and delivered build system upgrades with CMake. San’s technical depth is reflected in his ability to design, implement, and refine distributed storage systems with robust error handling and performance monitoring.
Overall Statistics
Feature vs Bugs
85%Features
Repository Contributions
17Total
Bugs
2
Commits
17
Features
11
Lines of code
1,630
Activity Months10
Your Network
36 peopleSame Organization
@ebay.com23
Shared Repositories
13
Work History
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for eBay/HomeStore focusing on memory-management APIs. Delivered new APIs to check block allocation status and to free blocks immediately during log replay, improving memory management and performance. Implemented isblk alloced and free_blk_now in dataservice to directly free blocks from bitmap cache and not depend on cp flush. This work lays groundwork for further performance optimizations and stability improvements during log replay.
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for eBay/HomeStore focusing on memory-management APIs. Delivered new APIs to check block allocation status and to free blocks immediately during log replay, improving memory management and performance. Implemented isblk alloced and free_blk_now in dataservice to directly free blocks from bitmap cache and not depend on cp flush. This work lays groundwork for further performance optimizations and stability improvements during log replay.
February 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025Month: 2025-12 | Repository: eBay/HomeStore Key features delivered: - Raft replication and logstore performance enhancements: Aligns chunk start offset to 4k to boost performance for 4k writes; introduces an inline flush mode for logstore in solo replication; optimizes completion callback execution to reduce raft latency (commit bfbd82565a2097e92c0e39ec75768029c68ad40f). Major bugs fixed: - Fixed performance degradation for 4k writes caused by non-4k-aligned chunk starts. Latency for 4k writes on p5gx improved from ~150µs to ~20µs; upgrade path remains backward compatible for existing nodes. Overall impact and accomplishments: - Substantial reduction in write and replication latency, improving throughput and user-facing performance for store operations. Enhances startup/upgrade reliability through performance-focused architectural tweaks and compatibility considerations. Technologies/skills demonstrated: - 4k alignment and NVMe block-size awareness, logstore optimization, raft replication tuning, inline flush mode, multi-threaded callback offload, performance benchmarking, and code maintainability.
December 2025
1 Commits • 1 Features
Dec 1, 2025Month: 2025-12 | Repository: eBay/HomeStore Key features delivered: - Raft replication and logstore performance enhancements: Aligns chunk start offset to 4k to boost performance for 4k writes; introduces an inline flush mode for logstore in solo replication; optimizes completion callback execution to reduce raft latency (commit bfbd82565a2097e92c0e39ec75768029c68ad40f). Major bugs fixed: - Fixed performance degradation for 4k writes caused by non-4k-aligned chunk starts. Latency for 4k writes on p5gx improved from ~150µs to ~20µs; upgrade path remains backward compatible for existing nodes. Overall impact and accomplishments: - Substantial reduction in write and replication latency, improving throughput and user-facing performance for store operations. Enhances startup/upgrade reliability through performance-focused architectural tweaks and compatibility considerations. Technologies/skills demonstrated: - 4k alignment and NVMe block-size awareness, logstore optimization, raft replication tuning, inline flush mode, multi-threaded callback offload, performance benchmarking, and code maintainability.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for eBay/HomeStore focusing on feature delivery and technical impact. Delivered a configurable index VDEV chunk size option, enabling performance tuning for large catalogs and IO optimization. The change required an upgrade to the homestore library version and targeted updates to the index service header/implementation, with a minor Conanfile adjustment to maintain build integrity. No major bug fixes were recorded this month; the emphasis was on delivering a foundation for scalable indexing and future performance improvements.
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for eBay/HomeStore focusing on feature delivery and technical impact. Delivered a configurable index VDEV chunk size option, enabling performance tuning for large catalogs and IO optimization. The change required an upgrade to the homestore library version and targeted updates to the index service header/implementation, with a minor Conanfile adjustment to maintain build integrity. No major bug fixes were recorded this month; the emphasis was on delivering a foundation for scalable indexing and future performance improvements.
September 2025
August 2025
1 Commits • 1 Features
Aug 1, 20252025-08 Monthly Summary for eBay/HomeStore: Implemented Index Table Size Control to improve resource allocation and predictability of index table usage; released homestore version 6.20.17 to reflect the change; no major bugs fixed this period. Demonstrated strong focus on scalability, performance, and maintainability with a clean release.”
August 2025
1 Commits • 1 Features
Aug 1, 20252025-08 Monthly Summary for eBay/HomeStore: Implemented Index Table Size Control to improve resource allocation and predictability of index table usage; released homestore version 6.20.17 to reflect the change; no major bugs fixed this period. Demonstrated strong focus on scalability, performance, and maintainability with a clean release.”
July 2025
2 Commits • 1 Features
Jul 1, 2025July 2025 — eBay/HomeStore checkpointing reliability and observability enhancements delivered to improve stability and performance visibility under high I/O loads. Implemented a dedicated reactor for the checkpoint timer to ensure timely execution and added latency metrics for checkpoint creation and block allocation to enable faster diagnostics and data-driven tuning. These changes reduce the risk of checkpoint stalls, support capacity planning, and lay groundwork for proactive latency optimization. Commits associated: 8cf9553762765b28fd49cac431a2cd30876e01bb (Run cp mgr timer in its own reactor) and 3ffa892baf4511842c5bbba16aefeb0ddeaa11a4 (Add metrics for cp and blk alloc latency).
2 Commits • 1 Features
Jul 1, 2025July 2025 — eBay/HomeStore checkpointing reliability and observability enhancements delivered to improve stability and performance visibility under high I/O loads. Implemented a dedicated reactor for the checkpoint timer to ensure timely execution and added latency metrics for checkpoint creation and block allocation to enable faster diagnostics and data-driven tuning. These changes reduce the risk of checkpoint stalls, support capacity planning, and lay groundwork for proactive latency optimization. Commits associated: 8cf9553762765b28fd49cac431a2cd30876e01bb (Run cp mgr timer in its own reactor) and 3ffa892baf4511842c5bbba16aefeb0ddeaa11a4 (Add metrics for cp and blk alloc latency).
July 2025
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for eBay/HomeStore: Focused on fortifying the solo replication development workflow and stabilizing log-device memory management to enable more reliable dev cycles and faster iteration.
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for eBay/HomeStore: Focused on fortifying the solo replication development workflow and stabilizing log-device memory management to enable more reliable dev cycles and faster iteration.
May 2025
3 Commits • 2 Features
May 1, 2025May 2025: Implemented essential I/O and serialization enhancements in eBay/HomeStore to boost throughput, data consistency, and operational flexibility. Key work includes Block Data Service I/O Enhancements with asynchronous write, cross-block allocation, and the new submit_io_batch API to finalize batched operations; and B-tree Mutation Serialization Context enabling per-operation serialization control via an application context propagated through mutation functions. These changes lay the groundwork for higher throughput, lower latency, and more configurable workloads for high-traffic storefront scenarios.
3 Commits • 2 Features
May 1, 2025May 2025: Implemented essential I/O and serialization enhancements in eBay/HomeStore to boost throughput, data consistency, and operational flexibility. Key work includes Block Data Service I/O Enhancements with asynchronous write, cross-block allocation, and the new submit_io_batch API to finalize batched operations; and B-tree Mutation Serialization Context enabling per-operation serialization control via an application context propagated through mutation functions. These changes lay the groundwork for higher throughput, lower latency, and more configurable workloads for high-traffic storefront scenarios.
May 2025
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 - Highlights for eBay/HomeStore: Delivered reliability and API improvements in log management and replication. Key features delivered include: (1) Enhanced log flush modes and recovery support: introduced timer-based and explicit flush options for the log device, improved graceful shutdown for tests, and persisted the flush mode in the super block to enable recovery during shutdown and restart. (2) Replication commit API enhancements (batching and ID handling): added an overloaded on_commit for replication to support a vector of MultiBlkId and extended async_alloc_write with a part_of_batch flag to enable batching flexibility; later refactor toward a single MultiBlkId for commits to simplify handling and improve API clarity. Major bug fix: fixed solo repl dev log flush and graceful shutdown issues observed during testing. Impact: stronger recovery semantics, safer shutdowns, and groundwork for higher-throughput replication. Technologies/skills demonstrated: log device flush control, super block metadata, batching patterns, MultiBlkId handling, async I/O, API design and refactoring.
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 - Highlights for eBay/HomeStore: Delivered reliability and API improvements in log management and replication. Key features delivered include: (1) Enhanced log flush modes and recovery support: introduced timer-based and explicit flush options for the log device, improved graceful shutdown for tests, and persisted the flush mode in the super block to enable recovery during shutdown and restart. (2) Replication commit API enhancements (batching and ID handling): added an overloaded on_commit for replication to support a vector of MultiBlkId and extended async_alloc_write with a part_of_batch flag to enable batching flexibility; later refactor toward a single MultiBlkId for commits to simplify handling and improve API clarity. Major bug fix: fixed solo repl dev log flush and graceful shutdown issues observed during testing. Impact: stronger recovery semantics, safer shutdowns, and groundwork for higher-throughput replication. Technologies/skills demonstrated: log device flush control, super block metadata, batching patterns, MultiBlkId handling, async I/O, API design and refactoring.
December 2024
1 Commits
Dec 1, 2024December 2024 monthly summary for eBay/HomeStore focusing on stability and data integrity improvements. Implemented a critical Journal Read Synchronization Bug Fix to prevent concurrent reads from causing data integrity issues in the journal vdev by introducing std::unique_lock with a flush_guard in LogDev.read and LogDev.read_record_header. This fix, backed by commit 707c11137a8de7dc859a6d00e933b8b33eee59e8, reduces data integrity risks and supports reliable journaling for customer workflows.
1 Commits
Dec 1, 2024December 2024 monthly summary for eBay/HomeStore focusing on stability and data integrity improvements. Implemented a critical Journal Read Synchronization Bug Fix to prevent concurrent reads from causing data integrity issues in the journal vdev by introducing std::unique_lock with a flush_guard in LogDev.read and LogDev.read_record_header. This fix, backed by commit 707c11137a8de7dc859a6d00e933b8b33eee59e8, reduces data integrity risks and supports reliable journaling for customer workflows.
December 2024
November 2024
2 Commits • 1 Features
Nov 1, 2024Month 2024-11 – Focused on strengthening dynamic member management in eBay/HomeStore via Raft replication. Delivered targeted enhancements to the Dynamic Member Management Test Suite, expanding coverage for member restarts, leader replacement, and handling of downed members. Temporarily disabled dynamic replication unit tests to stabilize CI and upgrade dependencies by modifying CMakeLists.txt and bumping the Conan package version. This work reduces production risk during dynamic reconfiguration and improves test reliability, visibility, and CI hygiene.
November 2024
2 Commits • 1 Features
Nov 1, 2024Month 2024-11 – Focused on strengthening dynamic member management in eBay/HomeStore via Raft replication. Delivered targeted enhancements to the Dynamic Member Management Test Suite, expanding coverage for member restarts, leader replacement, and handling of downed members. Temporarily disabled dynamic replication unit tests to stabilize CI and upgrade dependencies by modifying CMakeLists.txt and bumping the Conan package version. This work reduces production risk during dynamic reconfiguration and improves test reliability, visibility, and CI hygiene.
Activity
Loading activity data...
Quality Metrics
Correctness87.6%
Maintainability83.6%
Architecture84.2%
Performance78.8%
AI Usage21.2%
Skills & Technologies
Programming Languages
C++CMakePython
Technical Skills
API DevelopmentAsynchronous ProgrammingB-TreesBlock AllocationBuild System ConfigurationC++C++ DevelopmentC++ developmentConcurrencyConcurrency ControlData StructuresDistributed SystemsError HandlingMemory ManagementPerformance Monitoring
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline