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https://issues.apache.org/jira/browse/FLINK-11420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781413#comment-16781413
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Dawid Wysakowicz commented on FLINK-11420:
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I found out that there is a bug in {{TraversableSerializer#duplicate}} method.
> Serialization of case classes containing a Map[String, Any] sometimes throws
> ArrayIndexOutOfBoundsException
> -----------------------------------------------------------------------------------------------------------
>
> Key: FLINK-11420
> URL: https://issues.apache.org/jira/browse/FLINK-11420
> Project: Flink
> Issue Type: Bug
> Components: API / Type Serialization System
> Affects Versions: 1.7.1
> Reporter: Jürgen Kreileder
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.8.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> We frequently run into random ArrayIndexOutOfBounds exceptions when flink
> tries to serialize Scala case classes containing a Map[String, Any] (Any
> being String, Long, Int, or Boolean) with the FsStateBackend. (This probably
> happens with any case class containing a type requiring Kryo, see this thread
> for instance:
> [http://mail-archives.apache.org/mod_mbox/flink-user/201710.mbox/%3cCANNGFpjX4gjV=df6tlfeojsb_rhwxs_ruoylqcqv2gvwqtt...@mail.gmail.com%3e])
> Disabling asynchronous snapshots seems to work around the problem, so maybe
> something is not thread-safe in CaseClassSerializer.
> Our objects look like this:
> {code}
> case class Event(timestamp: Long, [...], content: Map[String, Any]
> case class EnrichedEvent(event: Event, additionalInfo: Map[String, Any])
> {code}
> I've looked at a few of the exceptions in a debugger. It always happens when
> serializing the right-hand side a tuple from EnrichedEvent -> Event ->
> content, e.g: 13 from ("foo", 13) or false from ("bar", false).
> Stacktrace:
> {code:java}
> java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 0
> at com.esotericsoftware.kryo.util.IntArray.pop(IntArray.java:157)
> at com.esotericsoftware.kryo.Kryo.reference(Kryo.java:822)
> at com.esotericsoftware.kryo.Kryo.copy(Kryo.java:863)
> at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.copy(KryoSerializer.java:217)
> 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.api.scala.typeutils.TraversableSerializer.$anonfun$copy$1(TraversableSerializer.scala:69)
> at scala.collection.immutable.HashMap$HashMap1.foreach(HashMap.scala:234)
> at scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:465)
> at scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:465)
> at
> org.apache.flink.api.scala.typeutils.TraversableSerializer.copy(TraversableSerializer.scala:69)
> at
> org.apache.flink.api.scala.typeutils.TraversableSerializer.copy(TraversableSerializer.scala:33)
> 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.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:101)
> at
> org.apache.flink.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:32)
> at
> org.apache.flink.api.common.typeutils.base.ListSerializer.copy(ListSerializer.java:99)
> at
> org.apache.flink.api.common.typeutils.base.ListSerializer.copy(ListSerializer.java:42)
> 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.HeapListState.add(HeapListState.java:95)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.processElement(WindowOperator.java:391)
> 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.base/java.lang.Thread.run(Thread.java:834){code}
>
>
>
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