[jira] [Commented] (FLINK-1531) Custom Kryo Serializer fails in itertation scenario

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

    [ https://issues.apache.org/jira/browse/FLINK-1531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318002#comment-14318002 ] 

Johannes commented on FLINK-1531:
---------------------------------

It seems that in the attached test scenario there is a MutableObjectIterator which is iterated and null is used to signal "no more".
Because kryo is in the mix - it eagerly tries to read "next" which fails with _buffer underflow_
So somewhere there should be a _hasNext_ call ..

> Custom Kryo Serializer fails in itertation scenario
> ---------------------------------------------------
>
>                 Key: FLINK-1531
>                 URL: https://issues.apache.org/jira/browse/FLINK-1531
>             Project: Flink
>          Issue Type: Bug
>          Components: Iterations
>    Affects Versions: 0.9
>            Reporter: Johannes
>            Assignee: Johannes
>         Attachments: TestKryoIterationSerializer.java
>
>
> When using iterations with a custom serializer for a domain object, the iteration will fail.
> {code:java}
> org.apache.flink.runtime.client.JobExecutionException: com.esotericsoftware.kryo.KryoException: Buffer underflow
> 	at org.apache.flink.api.java.typeutils.runtime.NoFetchingInput.require(NoFetchingInput.java:76)
> 	at com.esotericsoftware.kryo.io.Input.readVarInt(Input.java:355)
> 	at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:109)
> 	at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:641)
> 	at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:752)
> 	at org.apache.flink.api.java.typeutils.runtime.KryoSerializer.deserialize(KryoSerializer.java:198)
> 	at org.apache.flink.api.java.typeutils.runtime.KryoSerializer.deserialize(KryoSerializer.java:203)
> 	at org.apache.flink.runtime.io.disk.InputViewIterator.next(InputViewIterator.java:43)
> 	at org.apache.flink.runtime.iterative.task.IterationHeadPactTask.streamOutFinalOutputBulk(IterationHeadPactTask.java:404)
> 	at org.apache.flink.runtime.iterative.task.IterationHeadPactTask.run(IterationHeadPactTask.java:377)
> 	at org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:360)
> 	at org.apache.flink.runtime.execution.RuntimeEnvironment.run(RuntimeEnvironment.java:204)
> 	at java.lang.Thread.run(Thread.java:745)
> {code}



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