datastax/cassandra
Sep 2025 – Apr 2026
2 Months active
Languages Used
Java
Technical Skills
Backend DevelopmentJavabackend developmentmetrics monitoringperformance tuning
Niksa Jakovljevic
PROFILE
Niksa Jakovljevic
Worked on the datastax/cassandra repository to deliver targeted backend features focused on reliability and observability. Developed a public API for assureSufficientLiveReplicasForRead, enabling external validation of replication consistency and supporting governance and audit requirements with minimal code changes. Later, implemented a configurable flag for SAI histogram metrics, allowing users to enable or disable specific monitoring features for performance tuning while preserving default behaviors. Both features demonstrated skills in Java, backend development, and metrics monitoring, with careful attention to compatibility and risk mitigation. Collaborated across repositories and with upstream contributors, emphasizing maintainability and traceability in distributed systems environments.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
2Total
Bugs
0
Commits
2
Features
2
Lines of code
195
Activity Months2
Your Network
48 peopleShared Repositories
48
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026: Implemented a configurable flag for SAI histogram metrics in Cassandra (-Dcassandra.sai.metrics.histograms.enabled). Default remains enabled to preserve monitoring, with the option to disable for performance tuning or customization. This feature was ported from CNDB-17080 (upstream PR2267) and delivered with contributions from Andrés de la Peña and Ekaterina Dimitrova. Major bugs fixed: none reported this month. Overall impact: provides adjustable observability with low risk to existing workloads, enabling performance-tuning and customer-specific monitoring strategies. Technologies/skills demonstrated: feature flag design, metrics instrumentation, upstream collaboration, and PR porting.
1 Commits • 1 Features
Apr 1, 2026April 2026: Implemented a configurable flag for SAI histogram metrics in Cassandra (-Dcassandra.sai.metrics.histograms.enabled). Default remains enabled to preserve monitoring, with the option to disable for performance tuning or customization. This feature was ported from CNDB-17080 (upstream PR2267) and delivered with contributions from Andrés de la Peña and Ekaterina Dimitrova. Major bugs fixed: none reported this month. Overall impact: provides adjustable observability with low risk to existing workloads, enabling performance-tuning and customer-specific monitoring strategies. Technologies/skills demonstrated: feature flag design, metrics instrumentation, upstream collaboration, and PR porting.
April 2026
September 2025
1 Commits • 1 Features
Sep 1, 20252025-09: Focused on enabling external validation of replication consistency by exposing assureSufficientLiveReplicasForRead as a public API. This targeted change allows tooling and audits to verify that intersection of read and write replicas meets the configured CL requirements. Commit: 7e5827dff88d694eab2d64963ce5edcf8889ba34 (CNDB-14509). Related CNDB PR: https://github.com/riptano/cndb/pull/15317. No major bug fixes completed this month. Business impact: improved reliability, governance, and external validation capabilities with minimal surface-area changes to the codebase. Technologies/skills demonstrated: public API design, commit hygiene, cross-repo collaboration, distributed systems awareness.
September 2025
1 Commits • 1 Features
Sep 1, 20252025-09: Focused on enabling external validation of replication consistency by exposing assureSufficientLiveReplicasForRead as a public API. This targeted change allows tooling and audits to verify that intersection of read and write replicas meets the configured CL requirements. Commit: 7e5827dff88d694eab2d64963ce5edcf8889ba34 (CNDB-14509). Related CNDB PR: https://github.com/riptano/cndb/pull/15317. No major bug fixes completed this month. Business impact: improved reliability, governance, and external validation capabilities with minimal surface-area changes to the codebase. Technologies/skills demonstrated: public API design, commit hygiene, cross-repo collaboration, distributed systems awareness.
Activity
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Quality Metrics
Correctness100.0%
Maintainability90.0%
Architecture90.0%
Performance50.0%
AI Usage30.0%
Skills & Technologies
Programming Languages
Java
Technical Skills
Backend DevelopmentJavabackend developmentmetrics monitoringperformance tuning
Repositories Contributed To
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