liuzqt opened a new pull request, #52174: URL: https://github.com/apache/spark/pull/52174
### What changes were proposed in this pull request? There is race condition between `CachedRDDBuilder.cachedColumnBuffers` and `CachedRDDBuilder.clearCache`: when they interleave each other, `cachedColumnBuffers` might return a `nullptr`. This looks like a day-1 bug introduced from https://github.com/apache/spark/commit/20ca208bcda6f22fe7d9fb54144de435b4237536#diff-4068fce361a50e3d32af2ba2d4231905f500e7b2da9f46d5ddd99b758c30fd43 ### Why are the changes needed? The race condition might lead to NPE. ### Does this PR introduce _any_ user-facing change? NO ### How was this patch tested? Theoretically this race condition might be triggered as long as cache materialization and unpersistence happen on different thread. But there is no reliable way to construct unit test. ### Was this patch authored or co-authored using generative AI tooling? NO -- 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: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
