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https://issues.apache.org/jira/browse/SPARK-32705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-32705:
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Assignee: Apache Spark
> EmptyHashedRelation$; no valid constructor
> ------------------------------------------
>
> Key: SPARK-32705
> URL: https://issues.apache.org/jira/browse/SPARK-32705
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Leanken.Lin
> Assignee: Apache Spark
> Priority: Major
>
> Current EmptyHashedRelation is object and it will cause JavaDeserialization
> Exception as follow
>
> {code:java}
> // Stack
> 20/08/26 11:13:30 WARN [task-result-getter-2] TaskSetManager: Lost task 34.0
> in stage 57.0 (TID 18076, emr-worker-5.cluster-183257, executor 18): java
> .io.InvalidClassException:
> org.apache.spark.sql.execution.joins.EmptyHashedRelation$; no valid
> constructor
> at
> java.io.ObjectStreamClass$ExceptionInfo.newInvalidClassException(ObjectStreamClass.java:169)
> at
> java.io.ObjectStreamClass.checkDeserialize(ObjectStreamClass.java:874)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1572)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:430)
> at
> org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:76)
> at
> org.apache.spark.broadcast.TorrentBroadcast$.$anonfun$unBlockifyObject$4(TorrentBroadcast.scala:328)
> at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1377)
> at
> org.apache.spark.broadcast.TorrentBroadcast$.unBlockifyObject(TorrentBroadcast.scala:330)
> at
> org.apache.spark.broadcast.TorrentBroadcast.$anonfun$readBroadcastBlock$4(TorrentBroadcast.scala:249)
> at scala.Option.getOrElse(Option.scala:189)
> at
> org.apache.spark.broadcast.TorrentBroadcast.$anonfun$readBroadcastBlock$2(TorrentBroadcast.scala:223)
> at org.apache.spark.util.KeyLock.withLock(KeyLock.scala:64)
> at
> org.apache.spark.broadcast.TorrentBroadcast.$anonfun$readBroadcastBlock$1(TorrentBroadcast.scala:218)
> at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1343)
> {code}
> using case object instead to fix serialization issue. And also change
> EmptyHashedRelation not to extend NullAwareHashedRelation since it's already
> being used in other non-NAAJ joins.
>
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