Strikerrx01 commented on PR #34135: URL: https://github.com/apache/beam/pull/34135#issuecomment-2697761850
@stankiewicz The concurrent access test is designed to verify that our table definition cache is thread-safe. Specifically, it tests that: 1. Multiple threads can safely access the cache simultaneously without race conditions 2. The cache correctly deduplicates requests for the same table 3. The `RLock` in `_table_cache_lock` properly protects the cache Without this test, we wouldn't be confident that the cache behaves correctly in multi-threaded scenarios, which are common in Beam pipelines. For example: - If the lock wasn't working, we might make redundant API calls - If the cache wasn't thread-safe, we might get inconsistent results - If there were race conditions, we might miss cache hits The test creates 10 concurrent threads that all try to get the same table definition at the same time. We verify that despite concurrent access, we only make one API call total, proving that: 1. The first thread populates the cache 2. All other threads successfully read from the cache 3. The locking mechanism prevents duplicate API calls Would you like me to modify the test or add more assertions to make this clearer? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
