hddong opened a new pull request #25389: [SPARK-28657][CORE]Fix currentContext Instance failed sometimes URL: https://github.com/apache/spark/pull/25389 ## What changes were proposed in this pull request? Running spark on yarn, I got """ java.lang.ClassCastException: org.apache.hadoop.ipc.CallerContext$Builder cannot be cast to scala.runtime.Nothing$ """ Utils.classForName return Class[Nothing], I think it should be defind as Class[_] to resolve this issue ## How was this patch tested? not need Please review https://spark.apache.org/contributing.html before opening a pull request.
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