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https://issues.apache.org/jira/browse/SPARK-30267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Arseniy Tashoyan reopened SPARK-30267:
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With Spark 3.0.0 preview 2, I have the following failure here:
{code:java}
java.lang.ClassCastException: scala.collection.convert.Wrappers$SeqWrapper
cannot be cast to org.apache.avro.generic.GenericData$Array
at
org.apache.spark.sql.avro.AvroDeserializer.$anonfun$newWriter$19(AvroDeserializer.scala:170)
{code}
This means that the fix here [https://github.com/apache/spark/pull/26907] is
not actually a fix, because Scala Seq cannot be cast to
java.util.Collection[Any].
I have Scala Seq, because my Avro GenericRecord is generated from a case class
by Avro4s. We can expect, that everybody using Avro4s (or other Scala-written
generator like Avrohugger) will face the same ClassCastException.
> avro deserializer: ArrayList cannot be cast to GenericData$Array
> ----------------------------------------------------------------
>
> Key: SPARK-30267
> URL: https://issues.apache.org/jira/browse/SPARK-30267
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.4
> Reporter: Steven Aerts
> Assignee: Steven Aerts
> Priority: Major
> Fix For: 3.0.0
>
>
> On some more complex avro objects, the Avro Deserializer fails with the
> following stack trace:
> {code}
> java.lang.ClassCastException: java.util.ArrayList cannot be cast to
> org.apache.avro.generic.GenericData$Array
> at
> org.apache.spark.sql.avro.AvroDeserializer.$anonfun$newWriter$19(AvroDeserializer.scala:170)
> at
> org.apache.spark.sql.avro.AvroDeserializer.$anonfun$newWriter$19$adapted(AvroDeserializer.scala:169)
> at
> org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$1(AvroDeserializer.scala:314)
> at
> org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$1$adapted(AvroDeserializer.scala:310)
> at
> org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$2(AvroDeserializer.scala:332)
> at
> org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$2$adapted(AvroDeserializer.scala:329)
> at
> org.apache.spark.sql.avro.AvroDeserializer.$anonfun$converter$3(AvroDeserializer.scala:56)
> at
> org.apache.spark.sql.avro.AvroDeserializer.deserialize(AvroDeserializer.scala:70)
> {code}
> This is because the Deserializer assumes that an array is always of the very
> specific {{org.apache.avro.generic.GenericData$Array}} which is not always
> the case.
> Making it a normal list works.
> A github PR is coming up to fix this.
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