apache/spark
Jul 2025 – Sep 2025
2 Months active
Languages Used
ScalaBashYAML
Technical Skills
Scalabackend developmenttestingContinuous IntegrationDevOpsTesting
Kousuke Saruta
PROFILE
Kousuke Saruta
Sarutak focused on stabilizing and improving the reliability of Apache Spark’s test infrastructure, addressing persistent issues with flaky and hanging tests in the apache/spark repository. By refining interrupt handling in SparkSessionE2ESuite and replacing ForkJoinPool with a fixed thread pool, Sarutak ensured more deterministic and cross-platform test execution. These changes, implemented using Scala, Bash, and YAML, reduced indefinite waits and improved CI feedback cycles, particularly for streaming and concurrency scenarios. The work demonstrated strong debugging and backend development skills, resulting in fewer reruns and higher confidence in test results across macOS and Linux environments over the two-month period.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
5Total
Bugs
2
Commits
5
Features
0
Lines of code
52
Activity Months2
Your Network
298 people
Work History
September 2025
4 Commits
Sep 1, 2025September 2025: Delivered key test-stability improvements for Apache Spark with a focus on deterministic test execution and cross-platform reliability. Consolidated fixes across SparkConnectServiceSuite, SparkSessionE2ESuite, and AmmoniteTest enablement; replaced ForkJoinPool with a fixed thread pool to eliminate threading inheritance issues. Re-enabled AmmoniteTest tests in Maven builds to improve coverage and CI reliability. These changes reduced flaky failures, shortened feedback loops, and increased confidence in test results across macOS and Linux.
4 Commits
Sep 1, 2025September 2025: Delivered key test-stability improvements for Apache Spark with a focus on deterministic test execution and cross-platform reliability. Consolidated fixes across SparkConnectServiceSuite, SparkSessionE2ESuite, and AmmoniteTest enablement; replaced ForkJoinPool with a fixed thread pool to eliminate threading inheritance issues. Re-enabled AmmoniteTest tests in Maven builds to improve coverage and CI reliability. These changes reduced flaky failures, shortened feedback loops, and increased confidence in test results across macOS and Linux.
September 2025
July 2025
1 Commits
Jul 1, 2025July 2025 — Apache Spark: Stabilized SparkSessionE2ESuite interrupt handling to prevent test hangs, improving CI reliability and reducing flaky test runs. Refined the completion-detection logic for interrupt operations, addressing SPARK-50889. The change reduces indefinite waits and accelerates feedback for streaming-related changes. Demonstrated strong debugging, patch discipline, and collaboration with the test suite.
July 2025
1 Commits
Jul 1, 2025July 2025 — Apache Spark: Stabilized SparkSessionE2ESuite interrupt handling to prevent test hangs, improving CI reliability and reducing flaky test runs. Refined the completion-detection logic for interrupt operations, addressing SPARK-50889. The change reduces indefinite waits and accelerates feedback for streaming-related changes. Demonstrated strong debugging, patch discipline, and collaboration with the test suite.
Activity
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Quality Metrics
Correctness100.0%
Maintainability88.0%
Architecture88.0%
Performance88.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
BashScalaYAML
Technical Skills
Continuous IntegrationDevOpsScalaTestingbackend developmentconcurrencysoftware engineeringtesting
Repositories Contributed To
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