[jira] [Closed] (FLINK-11274) Scala 2.12 Kryo serialization bug

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-11274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek closed FLINK-11274.
------------------------------------
    Resolution: Not A Problem

Thanks for the update [~Zhen-hao]! Please re-open if you encounter it again and we can reproduce it.

> Scala 2.12 Kryo serialization bug
> ---------------------------------
>
>                 Key: FLINK-11274
>                 URL: https://issues.apache.org/jira/browse/FLINK-11274
>             Project: Flink
>          Issue Type: Bug
>    Affects Versions: 1.7.1
>         Environment: Flink 1.7.1
> Scala 2.12.8
>            Reporter: Zhenhao Li
>            Priority: Major
>
> The following code works well for serializing Scala classes, e.g., SortedSet[T], without problem in 1.7.0.
> ```
> env.getConfig.registerTypeWithKryoSerializer(
>       classOf[ClosureSerializer.Closure],
>       classOf[ClosureSerializer]
>     )
> ```
> However, in 1.7.1 the following error occurs when checkpointing. 
> ```
> Serialization trace:
> cmp$2 (scala.math.Ordering$$anon$6)
> 	at com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:138)
> 	at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:115)
> 	at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:641)
> 	at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:99)
> 	at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
> 	at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
> 	at com.twitter.chill.SortedSetSerializer.read(SortedSetSerializer.scala:38)
> 	at com.twitter.chill.SortedSetSerializer.read(SortedSetSerializer.scala:21)
> 	at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:657)
> 	at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.copy(KryoSerializer.java:231)
> 	at org.apache.flink.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:101)
> 	at org.apache.flink.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:32)
> 	at org.apache.flink.runtime.state.heap.CopyOnWriteStateTable.get(CopyOnWriteStateTable.java:287)
> 	at org.apache.flink.runtime.state.heap.CopyOnWriteStateTable.get(CopyOnWriteStateTable.java:311)
> 	at org.apache.flink.runtime.state.heap.HeapValueState.value(HeapValueState.java:73)
> 	at org.apache.flink.streaming.api.scala.function.StatefulFunction.applyWithState(StatefulFunction.scala:41)
> 	at org.apache.flink.streaming.api.scala.function.StatefulFunction.applyWithState$(StatefulFunction.scala:40)
> 	at org.apache.flink.streaming.api.scala.KeyedStream$$anon$3.applyWithState(KeyedStream.scala:591)
> 	at org.apache.flink.streaming.api.scala.KeyedStream$$anon$3.flatMap(KeyedStream.scala:596)
> 	at org.apache.flink.streaming.api.operators.StreamFlatMap.processElement(StreamFlatMap.java:50)
> 	at org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:202)
> 	at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:105)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
> 	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:704)
> 	at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.ClassNotFoundException: io.connecterra.stateful.AggregationSlidingWindowStateUpdater$$$Lambda$506/497325684
> 	at java.lang.Class.forName0(Native Method)
> 	at java.lang.Class.forName(Class.java:348)
> 	at com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:136)
> 	... 24 common frames omitted
> ```



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