Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6663#discussion_r31791723
--- Diff: core/src/main/scala/org/apache/spark/SerializableWritable.scala
---
@@ -41,7 +40,6 @@ class SerializableWritable[T <: Writable](@transient var
t: T) extends Serializa
private def readObject(in: ObjectInputStream): Unit =
Utils.tryOrIOException {
in.defaultReadObject()
val ow = new ObjectWritable()
- ow.setConf(new Configuration())
--- End diff --
Apparently other folks have noticed Configuration's expensive instantiation
costs, too: https://issues.apache.org/jira/browse/MAPREDUCE-5399
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