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Posted to issues@spark.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2015/09/15 13:32:45 UTC
[jira] [Commented] (SPARK-6152) Spark does not support Java 8
compiled Scala classes
[ https://issues.apache.org/jira/browse/SPARK-6152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14745278#comment-14745278 ]
Steve Loughran commented on SPARK-6152:
---------------------------------------
what changes? Yes, making sure there are no regressions. Hive had to upgrade to deal with bugs Kryo 2.21; for Spark 1.5 there's a special org.spark-project.hive artifact which downgraded to Kryo 2.21; the subset of Hive that spark-hive and spark-hive-thriftserver all work there. Hive would certainly veto any reverting to 2.21; I don't know what their stance would be to a 3.x upgrade on the 1.2 branch ... reluctant would be the default response, I suspect.
Getting everything to 2.24 is more likely, though if 3.x is needed for Java 8 compatibility it could be argued for
> Spark does not support Java 8 compiled Scala classes
> ----------------------------------------------------
>
> Key: SPARK-6152
> URL: https://issues.apache.org/jira/browse/SPARK-6152
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.2.1
> Environment: Java 8+
> Scala 2.11
> Reporter: Ronald Chen
> Priority: Minor
>
> Spark uses reflectasm to check Scala closures which fails if the *user defined Scala closures* are compiled to Java 8 class version
> The cause is reflectasm does not support Java 8
> https://github.com/EsotericSoftware/reflectasm/issues/35
> Workaround:
> Don't compile Scala classes to Java 8, Scala 2.11 does not support nor require any Java 8 features
> Stack trace:
> {code}
> java.lang.IllegalArgumentException
> at com.esotericsoftware.reflectasm.shaded.org.objectweb.asm.ClassReader.<init>(Unknown Source)
> at com.esotericsoftware.reflectasm.shaded.org.objectweb.asm.ClassReader.<init>(Unknown Source)
> at com.esotericsoftware.reflectasm.shaded.org.objectweb.asm.ClassReader.<init>(Unknown Source)
> at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$getClassReader(ClosureCleaner.scala:41)
> at org.apache.spark.util.ClosureCleaner$.getInnerClasses(ClosureCleaner.scala:84)
> at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:107)
> at org.apache.spark.SparkContext.clean(SparkContext.scala:1478)
> at org.apache.spark.rdd.RDD.map(RDD.scala:288)
> at ...my Scala 2.11 compiled to Java 8 code calling into spark
> {code}
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