Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6361#discussion_r30931814
--- Diff: core/src/main/scala/org/apache/spark/scheduler/ResultTask.scala
---
@@ -55,8 +56,17 @@ private[spark] class ResultTask[T, U](
// Deserialize the RDD and the func using the broadcast variables.
val deserializeStartTime = System.currentTimeMillis()
val ser = SparkEnv.get.closureSerializer.newInstance()
+ // Kryo deserialization is not thread-safe w.r.t. underlying buffer
+ // create a copy of the buffer if Kryo is being used
+ val copy = if
(SparkEnv.get.closureSerializer.isInstanceOf[KryoSerializer]) {
--- End diff --
Here, you might be able to check whether `ser` is an instance of
`KryoSerializerInstance` instead.
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