We're running into an error (below) when trying to read spilled shuffle
data back in.

Has anybody encountered this before / is anybody familiar with what causes
these Kryo UnsupportedOperationExceptions?

any guidance appreciated,
Sandy

---
com.esotericsoftware.kryo.KryoException
(com.esotericsoftware.kryo.KryoException:
java.lang.UnsupportedOperationException Serialization trace: <omitted
variable name> (<omitted class name>) <omitted variable name> (<omitted
class name>))

com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:626)

com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)

com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:648)

com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:605)

com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)

com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729)

com.twitter.chill.TraversableSerializer.read(Traversable.scala:44)
...

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