venkata91 commented 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-609559438 > tried to add an ut. > But I can not ensure that a speculation task would be launched. Thanks I guess even decreasing `spark.speculation.quantile` may be to 0.20 would also increase the chance of speculating tasks though you have set the `spark.speculation.multiple` to 0.0 anyway.
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