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From "Amit Sela (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-15489) Dataset kryo encoder fails on Collections$UnmodifiableCollection
Date Mon, 23 May 2016 21:09:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-15489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15297087#comment-15297087
] 

Amit Sela commented on SPARK-15489:
-----------------------------------

This is my registrator:

public class ImmutableRegistrator implements KryoRegistrator {

  @Override
  public void registerClasses(Kryo kryo) {
    try {
      kryo.register(Class.forName("java.util.Collections$UnmodifiableCollection"),
              new UnmodifiableCollectionsSerializer());
      kryo.register(ImmutableList.class, new ImmutableListSerializer());
    } catch (ClassNotFoundException e) {
      //
    }
  }
}

And I register with: 
conf.set("spark.kryo.registrator", ImmutableRegistrator.class.getCanonicalName())

When KryoSerializer.deserializeStream is called I see my registrar in KryoSerializerInstance,
but when KryoSerializer.deserialize[T: ClassTag](bytes: ByteBuffer) is called I'm not so sure,
if the instance is this.ks then no, I don't see my registrar.


> Dataset kryo encoder fails on Collections$UnmodifiableCollection
> ----------------------------------------------------------------
>
>                 Key: SPARK-15489
>                 URL: https://issues.apache.org/jira/browse/SPARK-15489
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.6.1
>            Reporter: Amit Sela
>
> When using Encoders with kryo to encode generically typed Objects in the following manner:
> public static <T> Encoder<T> encoder() {
>   return Encoders.kryo((Class<T>) Object.class);
> }
> I get a decoding exception when trying to decode `java.util.Collections$UnmodifiableCollection`,
which probably comes from Guava's `ImmutableList`.
> This happens when running with master = local[1]. Same code had no problems with RDD
api.



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