scylladb/scylla-cluster-tests
Jan 2025 – Mar 2026
7 Months active
Languages Used
PythonYAMLGroovyJSON
Technical Skills
Configuration ManagementPython DevelopmentTestingDevOpsDebuggingSystem Administration
Dusan Malusev
PROFILE
Dusan Malusev
Dusan Malusev developed and maintained the scylladb/scylla-cluster-tests suite, delivering features and fixes that improved reliability, observability, and test automation for distributed database systems. He upgraded core components such as Gemini and Scylla-bench, enhanced load balancing and monitoring, and introduced support for new tools like Cassandra Stress 4. Dusan’s work involved Python and Docker for backend development and test orchestration, with integration of Grafana dashboards and Jenkins pipelines for CI/CD. His contributions addressed complex issues in configuration management, debugging, and integration testing, resulting in a robust, maintainable test infrastructure that supports advanced benchmarking and compatibility validation workflows.
Overall Statistics
Feature vs Bugs
63%Features
Repository Contributions
21Total
Bugs
6
Commits
21
Features
10
Lines of code
5,680
Activity Months7
Work History
March 2026
8 Commits • 4 Features
Mar 1, 2026March 2026 (2026-03) monthly summary for scylladb/scylla-cluster-tests. Focused on reliability, observability, and cost efficiency in Gemini-driven tests. Key features delivered included Gemini library upgrade to 2.3.2 with debugging improvements and driver upgrade; Gemini test tooling enhancements adding --schema flag and --summary-file support; Oracle environment upgrades with storage-optimized instances and Oracle 2025.4 upgrade; Gemini Grafana dashboard and Argus monitoring integration. Major bugs fixed included Jenkins pipeline syntax error for Gemini tests and missing Docker image in integration tests. These deliverables, along with added unit tests and monitoring integration, improved reliability, cost efficiency, and observability. Technologies demonstrated include Jenkins pipeline debugging, Gemini library usage, Docker-based testing, Oracle instance optimization, Grafana/Argus integration, and Python-based test infra.
8 Commits • 4 Features
Mar 1, 2026March 2026 (2026-03) monthly summary for scylladb/scylla-cluster-tests. Focused on reliability, observability, and cost efficiency in Gemini-driven tests. Key features delivered included Gemini library upgrade to 2.3.2 with debugging improvements and driver upgrade; Gemini test tooling enhancements adding --schema flag and --summary-file support; Oracle environment upgrades with storage-optimized instances and Oracle 2025.4 upgrade; Gemini Grafana dashboard and Argus monitoring integration. Major bugs fixed included Jenkins pipeline syntax error for Gemini tests and missing Docker image in integration tests. These deliverables, along with added unit tests and monitoring integration, improved reliability, cost efficiency, and observability. Technologies demonstrated include Jenkins pipeline debugging, Gemini library usage, Docker-based testing, Oracle instance optimization, Grafana/Argus integration, and Python-based test infra.
March 2026
February 2026
4 Commits • 2 Features
Feb 1, 2026February 2026: Focused on reliability, observability, and safer load-balanced workloads in the scylladb/scylla-cluster-tests repo. Delivered native load balancing for YCSB and default load balancing across all Alternator workloads with validation to prevent misconfiguration; added YCSB version reporting in Argus for improved monitoring; stabilized integration tests by fixing a race condition, enhancing metrics handling, and introducing a TLS testing configuration option to trust self-signed certificates for testing environments. Commits underpinning these changes include 55e74319b1bd823103ed6fffd06b20b98cb812b0, 92e0d2120bf0f1eac475e93e7fa50b88a3706b0b, 8fca223291e37ae40ee13901464faea636af5d24, and 9f4cf0a04b3b0cd6cd76cddf35ff2c8aff57fb1f.
February 2026
4 Commits • 2 Features
Feb 1, 2026February 2026: Focused on reliability, observability, and safer load-balanced workloads in the scylladb/scylla-cluster-tests repo. Delivered native load balancing for YCSB and default load balancing across all Alternator workloads with validation to prevent misconfiguration; added YCSB version reporting in Argus for improved monitoring; stabilized integration tests by fixing a race condition, enhancing metrics handling, and introducing a TLS testing configuration option to trust self-signed certificates for testing environments. Commits underpinning these changes include 55e74319b1bd823103ed6fffd06b20b98cb812b0, 92e0d2120bf0f1eac475e93e7fa50b88a3706b0b, 8fca223291e37ae40ee13901464faea636af5d24, and 9f4cf0a04b3b0cd6cd76cddf35ff2c8aff57fb1f.
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026: Delivered Cassandra Stress 4 support and enhanced driver version reporting in the scylla-cluster-tests suite. The update enables Stress v4 validation on the master branch and provides precise driver version telemetry, strengthening compatibility testing, observability, and release readiness.
1 Commits • 1 Features
Jan 1, 2026January 2026: Delivered Cassandra Stress 4 support and enhanced driver version reporting in the scylla-cluster-tests suite. The update enables Stress v4 validation on the master branch and provides precise driver version telemetry, strengthening compatibility testing, observability, and release readiness.
January 2026
November 2025
2 Commits • 2 Features
Nov 1, 2025November 2025 focused on reliability, observability, and benchmarking for the scylla-cluster-tests suite. Key work included Gemini upgrade with mutation fragments, enhanced partition handling, and improved logging/error handling, together with statements logger improvements and backoff tuning to reduce flaky tests. The GoCQL driver was upgraded to 1.16.1, and the scylla-bench image was upgraded to 0.3.3, delivering stronger performance, diagnosability, and benchmarking fidelity.
November 2025
2 Commits • 2 Features
Nov 1, 2025November 2025 focused on reliability, observability, and benchmarking for the scylla-cluster-tests suite. Key work included Gemini upgrade with mutation fragments, enhanced partition handling, and improved logging/error handling, together with statements logger improvements and backoff tuning to reduce flaky tests. The GoCQL driver was upgraded to 1.16.1, and the scylla-bench image was upgraded to 0.3.3, delivering stronger performance, diagnosability, and benchmarking fidelity.
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for scylladb/scylla-cluster-tests focused on Gemini upgrades, observability enhancements, and testing stability. Delivered end-to-end upgrades of the Gemini Docker image with logging enhancements and configuration bumps, and fixed post-upgrade testing/metrics issues to improve reliability and diagnostics in CI pipelines.
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for scylladb/scylla-cluster-tests focused on Gemini upgrades, observability enhancements, and testing stability. Delivered end-to-end upgrades of the Gemini Docker image with logging enhancements and configuration bumps, and fixed post-upgrade testing/metrics issues to improve reliability and diagnostics in CI pipelines.
July 2025
June 2025
1 Commits
Jun 1, 2025June 2025 (2025-06) monthly summary for scylla-cluster-tests: focused on improving CLI usability and stability. Delivered a critical bug fix for Scylla-bench -help output (stdout instead of stderr) and upgraded the Scylla-bench dependency to 0.2.5. This work enhances reliability of test automation and reduces support friction, with no new user-facing features introduced this month.
June 2025
1 Commits
Jun 1, 2025June 2025 (2025-06) monthly summary for scylla-cluster-tests: focused on improving CLI usability and stability. Delivered a critical bug fix for Scylla-bench -help output (stdout instead of stderr) and upgraded the Scylla-bench dependency to 0.2.5. This work enhances reliability of test automation and reduces support friction, with no new user-facing features introduced this month.
January 2025
1 Commits
Jan 1, 2025Monthly Summary for 2025-01 focusing on scylladb/scylla-cluster-tests: Key bug fixed and test infrastructure stabilized. Delivered Gemini command handling fix, updated test suite configuration for upgrade and CDC scenarios, and bumped Gemini Docker image to align with the new command structure. No new features deployed this month; main impact is improved test reliability and CI stability.
1 Commits
Jan 1, 2025Monthly Summary for 2025-01 focusing on scylladb/scylla-cluster-tests: Key bug fixed and test infrastructure stabilized. Delivered Gemini command handling fix, updated test suite configuration for upgrade and CDC scenarios, and bumped Gemini Docker image to align with the new command structure. No new features deployed this month; main impact is improved test reliability and CI stability.
January 2025
Activity
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Quality Metrics
Correctness90.0%
Maintainability83.8%
Architecture82.8%
Performance81.0%
AI Usage23.8%
Skills & Technologies
Programming Languages
GroovyJSONPythonYAML
Technical Skills
CI/CDCloud InfrastructureConfiguration ManagementContainerizationDebuggingDevOpsDockerGrafanaJenkinsKubernetesPythonPython DevelopmentPython ScriptingPython developmentSystem Administration
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