Robert Metzger created FLINK-1391:
-------------------------------------
Summary: Kryo fails to properly serialize avro collection types
Key: FLINK-1391
URL: https://issues.apache.org/jira/browse/FLINK-1391
Project: Flink
Issue Type: Improvement
Affects Versions: 0.8, 0.9
Reporter: Robert Metzger
Before FLINK-610, Avro was the default generic serializer.
Now, special types coming from Avro are handled by Kryo .. which seems to cause
errors like:
{code}
Exception in thread "main"
org.apache.flink.runtime.client.JobExecutionException:
java.lang.NullPointerException
at org.apache.avro.generic.GenericData$Array.add(GenericData.java:200)
at
com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:116)
at
com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:22)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
at
org.apache.flink.api.java.typeutils.runtime.KryoSerializer.deserialize(KryoSerializer.java:143)
at
org.apache.flink.api.java.typeutils.runtime.KryoSerializer.deserialize(KryoSerializer.java:148)
at
org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:244)
at
org.apache.flink.runtime.plugable.DeserializationDelegate.read(DeserializationDelegate.java:56)
at
org.apache.flink.runtime.io.network.serialization.AdaptiveSpanningRecordDeserializer.getNextRecord(AdaptiveSpanningRecordDeserializer.java:71)
at
org.apache.flink.runtime.io.network.channels.InputChannel.readRecord(InputChannel.java:189)
at
org.apache.flink.runtime.io.network.gates.InputGate.readRecord(InputGate.java:176)
at
org.apache.flink.runtime.io.network.api.MutableRecordReader.next(MutableRecordReader.java:51)
at
org.apache.flink.runtime.operators.util.ReaderIterator.next(ReaderIterator.java:53)
at
org.apache.flink.runtime.operators.DataSinkTask.invoke(DataSinkTask.java:170)
at
org.apache.flink.runtime.execution.RuntimeEnvironment.run(RuntimeEnvironment.java:257)
at java.lang.Thread.run(Thread.java:744)
{code}
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