scylladb/scylladb
Feb 2025 – Apr 2026
7 Months active
Languages Used
C++MarkdownPythonYAMLreStructuredText
Technical Skills
API DesignBackend DevelopmentDatabaseDatabase ManagementDocumentationError Handling
Piotr Szymaniak
PROFILE
Piotr Szymaniak
Piotr Szymaniak contributed to the scylladb/scylladb repository by developing and refining features for Alternator, ScyllaDB’s DynamoDB-compatible API. Over seven months, he implemented configurable topology modes, Time To Live (TTL) support for tablets, and robust error handling for schema changes, using C++ and Python. Piotr enhanced test automation and documentation, improving reliability during topology changes and streamlining developer onboarding. His work included clarifying delta mode handling to optimize performance and updating audit documentation for compliance. By addressing both backend logic and developer experience, Piotr demonstrated depth in distributed systems, database internals, and technical writing, delivering maintainable, production-ready solutions.
Overall Statistics
Feature vs Bugs
64%Features
Repository Contributions
22Total
Bugs
4
Commits
22
Features
7
Lines of code
1,095
Activity Months7
Your Network
196 peopleWork History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for scylladb/scylladb: Focused on clarifying Delta Mode handling in Add Stream Options to optimize performance and reduce overhead in Alternator-backed streams. Implemented an inline comment explaining delta_mode::keys usage and that cdc::delta_mode is ignored by Alternator to minimize overhead. Linked and closed issues scylladb/scylladb#24812 and scylladb/scylladb#29408 via commit 98d6edaa885d8dd46b76d4ab887e2dc9a701e182. Result: clearer guidance for developers, lower runtime overhead, and improved maintainability.
1 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for scylladb/scylladb: Focused on clarifying Delta Mode handling in Add Stream Options to optimize performance and reduce overhead in Alternator-backed streams. Implemented an inline comment explaining delta_mode::keys usage and that cdc::delta_mode is ignored by Alternator to minimize overhead. Linked and closed issues scylladb/scylladb#24812 and scylladb/scylladb#29408 via commit 98d6edaa885d8dd46b76d4ab887e2dc9a701e182. Result: clearer guidance for developers, lower runtime overhead, and improved maintainability.
April 2026
March 2026
4 Commits • 1 Features
Mar 1, 2026Month: 2026-03 – Concise monthly summary focusing on reliability, stability, and governance improvements for ScyllaDB’s Alternator and topology-change workflows. The month emphasized robust error handling, test stabilization during topology and cross-DC replication changes, and improved auditability for Alternator operations.
March 2026
4 Commits • 1 Features
Mar 1, 2026Month: 2026-03 – Concise monthly summary focusing on reliability, stability, and governance improvements for ScyllaDB’s Alternator and topology-change workflows. The month emphasized robust error handling, test stabilization during topology and cross-DC replication changes, and improved auditability for Alternator operations.
December 2025
1 Commits
Dec 1, 2025December 2025 — Key achievement: Documentation accuracy improvement for the audit feature in scylladb/scylladb. Delivered a targeted fix correcting a reference in dev/audit.md to align with the audit specification concept (commit 9c5b4e74c31831b8b575d47bc4c096c2790e15c4; closes scylladb/scylladb#27832). Impact: reduces confusion, strengthens governance/compliance readiness, and improves developer guidance. No code changes were required this month; business value is realized through higher-quality docs and reduced support overhead. Technologies/skills demonstrated include Git-based change management, Markdown documentation, and issue-tracking workflows.
1 Commits
Dec 1, 2025December 2025 — Key achievement: Documentation accuracy improvement for the audit feature in scylladb/scylladb. Delivered a targeted fix correcting a reference in dev/audit.md to align with the audit specification concept (commit 9c5b4e74c31831b8b575d47bc4c096c2790e15c4; closes scylladb/scylladb#27832). Impact: reduces confusion, strengthens governance/compliance readiness, and improves developer guidance. No code changes were required this month; business value is realized through higher-quality docs and reduced support overhead. Technologies/skills demonstrated include Git-based change management, Markdown documentation, and issue-tracking workflows.
December 2025
October 2025
3 Commits • 1 Features
Oct 1, 2025Month 2025-10 focused on enhancing the Alternator Testing Framework in scylladb/scylladb to improve reliability and coverage of TTL and paging behavior. Implemented TTL tests with tablets (removing vnode requirement), enhanced paging tests, and aligned TTL expiration streams with the new system naming convention. These changes reduce test fragility across tablet and vnode configurations, increase test data realism, and improve confidence in DynamoDB-compatible features. The work is reflected in a set of commits that address test stability and correctness across different cluster shapes (e.g., varying tablets per shard).
October 2025
3 Commits • 1 Features
Oct 1, 2025Month 2025-10 focused on enhancing the Alternator Testing Framework in scylladb/scylladb to improve reliability and coverage of TTL and paging behavior. Implemented TTL tests with tablets (removing vnode requirement), enhanced paging tests, and aligned TTL expiration streams with the new system naming convention. These changes reduce test fragility across tablet and vnode configurations, increase test data realism, and improve confidence in DynamoDB-compatible features. The work is reflected in a set of commits that address test stability and correctness across different cluster shapes (e.g., varying tablets per shard).
September 2025
8 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for scylladb/scylladb focusing on Alternator topology configurability and test/docs hygiene. Delivered a configurable tablets/vnodes mode for new keyspaces in Alternator via the tablets_mode_for_new_keyspaces flag, enabling per-table side overrides with system:initial_tablets. Updated and harmonized documentation, renamed tags, and refreshed tests to align with the new policy. Removed obsolete tests that no longer reflected the supported topology. Overall, the changes increase flexibility, reduce misconfigurations, and improve reliability for Alternator deployments.
8 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for scylladb/scylladb focusing on Alternator topology configurability and test/docs hygiene. Delivered a configurable tablets/vnodes mode for new keyspaces in Alternator via the tablets_mode_for_new_keyspaces flag, enabling per-table side overrides with system:initial_tablets. Updated and harmonized documentation, renamed tags, and refreshed tests to align with the new policy. Removed obsolete tests that no longer reflected the supported topology. Overall, the changes increase flexibility, reduce misconfigurations, and improve reliability for Alternator deployments.
September 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for scylladb/scylladb: Delivered TTL support for tablets in ScyllaDB Alternator, enabling TTL-based cleanup for tablet partitions and ensuring correctness during failover via secondary replicas. Implemented a dedicated TTL removal path for tablet data, with tests covering both vnodes and tablet configurations. This work improves data lifecycle management in Alternator-backed workloads, reduces stale data, and enhances fault tolerance when primary replicas are unavailable. Technologies demonstrated: TTL lifecycle, tablet-based data paths, replica-aware cleanup, and expanded test automation for both vnodes and tablet configurations. Commit reference: de96c286253cc27977ef65021bf47b02fa863155.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for scylladb/scylladb: Delivered TTL support for tablets in ScyllaDB Alternator, enabling TTL-based cleanup for tablet partitions and ensuring correctness during failover via secondary replicas. Implemented a dedicated TTL removal path for tablet data, with tests covering both vnodes and tablet configurations. This work improves data lifecycle management in Alternator-backed workloads, reduces stale data, and enhances fault tolerance when primary replicas are unavailable. Technologies demonstrated: TTL lifecycle, tablet-based data paths, replica-aware cleanup, and expanded test automation for both vnodes and tablet configurations. Commit reference: de96c286253cc27977ef65021bf47b02fa863155.
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025: Delivered critical reliability and developer productivity improvements for scylladb/scylladb. Implemented Alternator input validation with tests to enforce stream enable/disable behavior and attribute name length constraints; improved CreateTable error handling to return DynamoDB-like validation errors with tests; added CLion IDE setup guidance in HACKING.md to streamline local development. These changes reduce runtime errors, improve DynamoDB compatibility, and accelerate onboarding and development workflows.
4 Commits • 2 Features
Feb 1, 2025February 2025: Delivered critical reliability and developer productivity improvements for scylladb/scylladb. Implemented Alternator input validation with tests to enforce stream enable/disable behavior and attribute name length constraints; improved CreateTable error handling to return DynamoDB-like validation errors with tests; added CLion IDE setup guidance in HACKING.md to streamline local development. These changes reduce runtime errors, improve DynamoDB compatibility, and accelerate onboarding and development workflows.
February 2025
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Quality Metrics
Correctness97.8%
Maintainability91.8%
Architecture91.4%
Performance93.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++MarkdownPythonYAMLreStructuredText
Technical Skills
API DesignAPI developmentBackend DevelopmentC++C++ DevelopmentC++ developmentCode documentationDatabaseDatabase InternalsDatabase ManagementDistributed SystemsDocumentationDynamoDBError HandlingIDE Configuration
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