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APEXMALHAR-2481 support lambda expressions with high level API #617
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davidyan74
approved these changes
May 7, 2017
| @@ -35,7 +35,7 @@ | |||
| * @since 3.4.0 | |||
| */ | |||
| @InterfaceStability.Evolving | |||
| public interface Function | |||
| public interface Function extends java.io.Serializable | |||
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Would kryo's @DefaultSerializer work for interfaces? If so, maybe we should add it here?
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Kryo cannot load a lambda class. Therefore the problem described below applies, even if the annotation is recognized, which I'm not sure about either.
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Caused by: com.esotericsoftware.kryo.KryoException: Unable to find class: com.example.myapexapp.ApplicationWithHighLevelAPI$$Lambda$4/1847509784
Serialization trace:
value (org.apache.commons.lang3.mutable.MutableObject)
statefulF (org.apache.apex.malhar.lib.function.FunctionOperator$FlatMapFunctionOperator)
at com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:138)
at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:115)
at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:641)
at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:99)
at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679)
at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
at com.datatorrent.common.util.FSStorageAgent.retrieve(FSStorageAgent.java:192)
at com.datatorrent.stram.plan.logical.LogicalPlan$OperatorMeta.readObject(LogicalPlan.java:898)
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@davidyan74 @siyuanh please review