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From "Stefano Bortoli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2800) kryo serialization problem
Date Tue, 06 Oct 2015 13:18:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14945008#comment-14945008

Stefano Bortoli commented on FLINK-2800:

I have added a couple of them, but it did not change anything. So, I removed them. I think
it is a race condition, which is in general hard to reproduce. We had a similar problem when
increasing load on a server using non-blocking calls. Kryo is not thread-safe, and we solved
using a pool. The Kryo serializer of flink uses the twitter library, but in the end what is
used is simply the constructor, without the pool. Perhaps using the pool would solve these

> kryo serialization problem
> --------------------------
>                 Key: FLINK-2800
>                 URL: https://issues.apache.org/jira/browse/FLINK-2800
>             Project: Flink
>          Issue Type: Bug
>          Components: Type Serialization System
>    Affects Versions: 1.0
>         Environment: linux ubuntu 12.04 LTS, Java 7
>            Reporter: Stefano Bortoli
> Performing a cross of two dataset of POJOs I have got the exception below. The first
time I run the process, there was no problem. When I run it the second time, I have got the
exception. My guess is that it could be a race condition related to the reuse of the Kryo
serializer object. However, it could also be "a bug where type registrations are not properly
forwarded to all Serializers", as suggested by Stephan.
> ------------------------------------------------------------------------
> 2015-10-01 18:18:21 INFO  JobClient:161 - 10/01/2015 18:18:21	Cross(Cross at main(FlinkMongoHadoop2LinkPOI2CDA.java:160))(3/4)
switched to FAILED 
> com.esotericsoftware.kryo.KryoException: Encountered unregistered class ID: 114
> 	at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:119)
> 	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.kryo.KryoSerializer.deserialize(KryoSerializer.java:210)
> 	at org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:127)
> 	at org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:30)
> 	at org.apache.flink.runtime.operators.resettable.AbstractBlockResettableIterator.getNextRecord(AbstractBlockResettableIterator.java:180)
> 	at org.apache.flink.runtime.operators.resettable.BlockResettableMutableObjectIterator.next(BlockResettableMutableObjectIterator.java:111)
> 	at org.apache.flink.runtime.operators.CrossDriver.runBlockedOuterSecond(CrossDriver.java:309)
> 	at org.apache.flink.runtime.operators.CrossDriver.run(CrossDriver.java:162)
> 	at org.apache.flink.runtime.operators.RegularPactTask.run(RegularPactTask.java:489)
> 	at org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:354)
> 	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:581)
> 	at java.lang.Thread.run(Thread.java:745)

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