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https://issues.apache.org/jira/browse/SPARK-19675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877290#comment-15877290
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Kohki Nishio commented on SPARK-19675:
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not in a separate process, I'm running it in local mode, so executor lives
within the same JVM, that's why it's picking up classes from sbt.
This ExecutorClassLoader's actual 'parentLoader' is the one handles REPL
(remote class loader), however it's backed by its local class loader
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/executor/Executor.scala#L580
So I believe it is the right thing to load from there.
> ExecutorClassLoader loads classes from SystemClassLoader
> --------------------------------------------------------
>
> Key: SPARK-19675
> URL: https://issues.apache.org/jira/browse/SPARK-19675
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.0, 2.2.0
> Environment: sbt / Play Framework
> Reporter: Kohki Nishio
> Priority: Minor
>
> Spark Executor loads classes from SystemClassLoader which contains
> sbt-launch.jar and it contains Scala2.10 binary, however Spark itself is
> built on Scala2.11, thus it's throwing InvalidClassException
> java.io.InvalidClassException: scala.Option; local class incompatible: stream
> classdesc serialVersionUID = -114498752079829388, local class
> serialVersionUID = 5081326844987135632
> at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:616)
> at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1630)
> at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
> at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1630)
> at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1781)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
> at
> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
> ExecutorClassLoader's desired class loder (parentLoader) actually contains
> the correct path (scala-library-2.11.8.jar) but it is not being used.
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