ParDoLifecycleTest concurrency bug - callStateMap

[stankiewicz]

callStateMap was accessed from multiple threads without synchronization. changing callStateMap to concurrent hashmap.

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[gemini-code-assist]

Summary of Changes

Hello @stankiewicz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical concurrency issue within the ParDoLifecycleTest by upgrading the callStateMap from a standard HashMap to a ConcurrentHashMap. This change ensures that the test's internal state tracking mechanism can handle multi-threaded access without introducing race conditions, thereby improving the reliability and accuracy of the test in concurrent environments. The modifications also include adjustments to the test setup and validation logic to align with the new thread-safe map implementation.

Highlights

• Concurrency Bug Fix: Resolved a concurrency bug in ParDoLifecycleTest where callStateMap was accessed by multiple threads without proper synchronization, leading to potential race conditions.
• Thread-Safe Map Implementation: Replaced the non-thread-safe HashMap with ConcurrentHashMap for ExceptionThrowingFn.callStateMap to ensure thread-safe operations.
• Test Setup Refinement: Modified the setup() method to clear the callStateMap instead of re-initializing it, which is appropriate for a static ConcurrentHashMap.
• Correct Map Cloning for Validation: Updated the validate method to correctly create a synchronized map from the ConcurrentHashMap's entry set for assertion purposes, replacing the direct clone() call which is not available on ConcurrentHashMap.

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[github-actions]

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R: @chamikaramj for label java.

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[Abacn]

Thanks!