turboFei edited a comment on issue #26339: [SPARK-27194][SPARK-29302][SQL] Fix the issue that for dynamic partition overwrite a task would conflict with its speculative task URL: https://github.com/apache/spark/pull/26339#issuecomment-613445024 Revert to origin code. It seems that let all tasks, which have same stageId and taskId, to rename their dynamic staging task files is the best plan. Otherwise, it is too complex, and may cause data loss.
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