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From Fabian Hueske <fhue...@gmail.com>
Subject Re: Core Memory Error
Date Wed, 11 Nov 2015 22:00:41 GMT
Hi Ali,

Flink uses different serializers for different data types. For example,
(boxed) primitives are serialized using dedicated serializers
(IntSerializer, StringSerializer, etc.) and the ProtocolEvent class is
recognized as a Pojo type and therefore serialized using Flink's
PojoSerializer.
Types that cannot be (fully) analyzed are handled as GenericTypes and
serialized using Flink's KryoSerializer.

By forcing Kryo serialization as I suggested before, Pojo types (such as
ProtocolEvent) will be serialized with Kryo instead of Flink's
PojoSerializer.
Hence, forcing Kryo only affects Pojo types. GenericTypes (such as
ProtocolAttributeMap and ProtocolDetailMap) are always handled by Kryo
(also without forcing it).

The exceptions you are facing might be caused by a bug in the
KryoSerializer that we recently fixed (see FLINK-2800 [1]). This bug
basically corrupts the stream of serialized data and might very well also
be responsible for the original exception you posted. As you see from the
JIRA issue, a bug fix was merged to all active branches however it is not
yet contained in an official release.

I would recommend you to try the latest candidate of the upcoming 0.10
release [2] or build Flink from the 0.9-release branch [3].

Please let me know if you have any questions or still facing problems when
switching to version with a fix for FLINK-2800.

Best, Fabian

[1] https://issues.apache.org/jira/browse/FLINK-2800
[2] http://people.apache.org/~mxm/flink-0.10.0-rc8/
[3] https://github.com/apache/flink/tree/release-0.9

2015-11-11 17:20 GMT+01:00 Kashmar, Ali <Ali.Kashmar@emc.com>:

> Fabian,
>
> I tried running it again and I noticed there were some more exceptions in
> the log. I fixed those and I don’t see the original error but I do see
> other ArrayIndexOutofBoundExceptions in the Kryo serializer code (I didn’t
> even enable that yet like you suggested). Examples:
>
> 1)
>
> 10:49:36,331 ERROR org.apache.flink.streaming.api.collector.StreamOutput
>       - Emit failed due to: java.lang.ArrayIndexOutOfBoundsException: 255
>         at
> com.esotericsoftware.kryo.util.IdentityObjectIntMap.clear(IdentityObjectInt
> Map.java:364)
>         at
> com.esotericsoftware.kryo.util.MapReferenceResolver.reset(MapReferenceResol
> ver.java:47)
>         at com.esotericsoftware.kryo.Kryo.reset(Kryo.java:836)
>         at
> com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:601)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.jav
> a:95)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.jav
> a:21)
>         at
> com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:599)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.serialize(K
> ryoSerializer.java:186)
>         at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.serialize(PojoSe
> rializer.java:372)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.seri
> alize(StreamRecordSerializer.java:89)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.seri
> alize(StreamRecordSerializer.java:29)
>         at
> org.apache.flink.runtime.plugable.SerializationDelegate.write(Serialization
> Delegate.java:51)
>         at
> org.apache.flink.runtime.io.network.api.serialization.SpanningRecordSeriali
> zer.addRecord(SpanningRecordSerializer.java:76)
>         at
> org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWrit
> er.java:83)
>         at
> org.apache.flink.streaming.runtime.io.StreamRecordWriter.emit(StreamRecordW
> riter.java:58)
>         at
> org.apache.flink.streaming.api.collector.StreamOutput.collect(StreamOutput.
> java:62)
>         at
> org.apache.flink.streaming.api.collector.CollectorWrapper.collect(Collector
> Wrapper.java:40)
>         at
> org.apache.flink.streaming.api.operators.StreamSource$1.collect(StreamSourc
> e.java:40)
>         at
> com.emc.ngen.analytics.flink.job.ClientTask.run(ClientTask.java:36)
>         at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1
> 142)
>         at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:
> 617)
>         at java.lang.Thread.run(Thread.java:745)
>
>
>
> 2)
> 10:49:36,333 ERROR org.apache.flink.streaming.api.collector.StreamOutput
>       - Emit failed due to: java.lang.ArrayIndexOutOfBoundsException: 334
>         at
> com.esotericsoftware.kryo.util.IdentityObjectIntMap.push(IdentityObjectIntM
> ap.java:207)
>         at
> com.esotericsoftware.kryo.util.IdentityObjectIntMap.put(IdentityObjectIntMa
> p.java:117)
>         at
> com.esotericsoftware.kryo.util.MapReferenceResolver.addWrittenObject(MapRef
> erenceResolver.java:23)
>         at
> com.esotericsoftware.kryo.Kryo.writeReferenceOrNull(Kryo.java:629)
>         at
> com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:594)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.jav
> a:88)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.jav
> a:21)
>         at
> com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:599)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.serialize(K
> ryoSerializer.java:186)
>         at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.serialize(PojoSe
> rializer.java:372)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.seri
> alize(StreamRecordSerializer.java:89)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.seri
> alize(StreamRecordSerializer.java:29)
>         at
> org.apache.flink.runtime.plugable.SerializationDelegate.write(Serialization
> Delegate.java:51)
>         at
> org.apache.flink.runtime.io.network.api.serialization.SpanningRecordSeriali
> zer.addRecord(SpanningRecordSerializer.java:76)
>         at
> org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWrit
> er.java:83)
>         at
> org.apache.flink.streaming.runtime.io.StreamRecordWriter.emit(StreamRecordW
> riter.java:58)
>         at
> org.apache.flink.streaming.api.collector.StreamOutput.collect(StreamOutput.
> java:62)
>         at
> org.apache.flink.streaming.api.collector.CollectorWrapper.collect(Collector
> Wrapper.java:40)
>         at
> org.apache.flink.streaming.api.operators.StreamSource$1.collect(StreamSourc
> e.java:40)
>         at
> com.emc.ngen.analytics.flink.job.ClientTask.run(ClientTask.java:36)
>         at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1
> 142)
>         at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:
> 617)
>         at java.lang.Thread.run(Thread.java:745)
>
> 3)
>
> com.esotericsoftware.kryo.KryoException: Encountered unregistered class
> ID: 106
>         at
> com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassR
> esolver.java:119)
>         at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:641)
>         at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:752)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java
> :135)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java
> :21)
>         at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize
> (KryoSerializer.java:211)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize
> (KryoSerializer.java:225)
>         at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(Pojo
> Serializer.java:499)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.dese
> rialize(StreamRecordSerializer.java:102)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.dese
> rialize(StreamRecordSerializer.java:29)
>         at
> org.apache.flink.runtime.plugable.ReusingDeserializationDelegate.read(Reusi
> ngDeserializationDelegate.java:57)
>         at
> org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptiveSpann
> ingRecordDeserializer.getNextRecord(SpillingAdaptiveSpanningRecordDeseriali
> zer.java:110)
>         at
> org.apache.flink.streaming.runtime.io.StreamingAbstractRecordReader.getNext
> Record(StreamingAbstractRecordReader.java:80)
>         at
> org.apache.flink.streaming.runtime.io.StreamingMutableRecordReader.next(Str
> eamingMutableRecordReader.java:36)
>         at
> org.apache.flink.runtime.operators.util.ReaderIterator.next(ReaderIterator.
> java:59)
>         at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.readNext(OneInp
> utStreamTask.java:68)
>         at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.invoke(OneInput
> StreamTask.java:101)
>         at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
>         at java.lang.Thread.run(Thread.java:745)
>
> 4)
>
> java.lang.IllegalArgumentException: You can store only Strings, Integer
> and Longs in the ProtocolDetailMap, not: 'false' for 'null'
>         at
> io.pivotal.rti.protocols.ProtocolDetailMap.put(ProtocolDetailMap.java:100)
>         at
> io.pivotal.rti.protocols.ProtocolDetailMap.put(ProtocolDetailMap.java:23)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java
> :144)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java
> :21)
>         at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize
> (KryoSerializer.java:211)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize
> (KryoSerializer.java:225)
>         at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(Pojo
> Serializer.java:499)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.dese
> rialize(StreamRecordSerializer.java:102)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.dese
> rialize(StreamRecordSerializer.java:29)
>         at
> org.apache.flink.runtime.plugable.ReusingDeserializationDelegate.read(Reusi
> ngDeserializationDelegate.java:57)
>         at
> org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptiveSpann
> ingRecordDeserializer.getNextRecord(SpillingAdaptiveSpanningRecordDeseriali
> zer.java:110)
>         at
> org.apache.flink.streaming.runtime.io.StreamingAbstractRecordReader.getNext
> Record(StreamingAbstractRecordReader.java:80)
>         at
> org.apache.flink.streaming.runtime.io.StreamingMutableRecordReader.next(Str
> eamingMutableRecordReader.java:36)
>         at
> org.apache.flink.runtime.operators.util.ReaderIterator.next(ReaderIterator.
> java:59)
>         at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.readNext(OneInp
> utStreamTask.java:68)
>         at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.invoke(OneInput
> StreamTask.java:101)
>         at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
>         at java.lang.Thread.run(Thread.java:745)
>
> 5)
>
>
> java.lang.IndexOutOfBoundsException: Index: 85, Size: 9
>         at java.util.ArrayList.rangeCheck(ArrayList.java:653)
>         at java.util.ArrayList.get(ArrayList.java:429)
>         at
> com.esotericsoftware.kryo.util.MapReferenceResolver.getReadObject(MapRefere
> nceResolver.java:42)
>         at
> com.esotericsoftware.kryo.Kryo.readReferenceOrNull(Kryo.java:805)
>         at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:759)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java
> :135)
>         at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java
> :21)
>         at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize
> (KryoSerializer.java:211)
>         at
> org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize
> (KryoSerializer.java:225)
>         at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(Pojo
> Serializer.java:499)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.dese
> rialize(StreamRecordSerializer.java:102)
>         at
> org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.dese
> rialize(StreamRecordSerializer.java:29)
>         at
> org.apache.flink.runtime.plugable.ReusingDeserializationDelegate.read(Reusi
> ngDeserializationDelegate.java:57)
>         at
> org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptiveSpann
> ingRecordDeserializer.getNextRecord(SpillingAdaptiveSpanningRecordDeseriali
> zer.java:110)
>         at
> org.apache.flink.streaming.runtime.io.StreamingAbstractRecordReader.getNext
> Record(StreamingAbstractRecordReader.java:80)
>         at
> org.apache.flink.streaming.runtime.io.StreamingMutableRecordReader.next(Str
> eamingMutableRecordReader.java:36)
>         at
> org.apache.flink.runtime.operators.util.ReaderIterator.next(ReaderIterator.
> java:59)
>         at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.readNext(OneInp
> utStreamTask.java:68)
>         at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.invoke(OneInput
> StreamTask.java:101)
>         at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
>         at java.lang.Thread.run(Thread.java:745)
>
>
>
> As you can tell, there’s a common theme there which is the MapSerializer
> in Kryo. The source of my grief seems to be the two java.util.Map
> implementations ProtocolAttributeMap and ProtocolDetailMap. They’re custom
> implementations and they’re anal about what types of objects you can have
> as values.
>
>
> Here’s the output of the gist you asked me to run:
>
> class org.apache.flink.api.java.typeutils.PojoTypeInfo : class
> io.pivotal.rti.protocols.ProtocolEvent
> (
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.common.typeinfo.IntegerTypeInfo : class
> java.lang.Long
> class org.apache.flink.api.common.typeinfo.IntegerTypeInfo : class
> java.lang.Long
> class org.apache.flink.api.common.typeinfo.IntegerTypeInfo : class
> java.lang.Long
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.java.typeutils.GenericTypeInfo : class
> io.pivotal.rti.protocols.ProtocolAttributeMap
> class org.apache.flink.api.java.typeutils.GenericTypeInfo : class
> io.pivotal.rti.protocols.ProtocolDetailMap
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.common.typeinfo.IntegerTypeInfo : class
> java.lang.Short
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> class org.apache.flink.api.common.typeinfo.IntegerTypeInfo : class
> java.lang.Short
> class org.apache.flink.api.common.typeinfo.BasicTypeInfo : class
> java.lang.String
> )
>
>
> Right now, I’m using the gson library to convert the ProtocolEvent
> instance to JSON and back. I think I have to write a custom converter to
> make ProtocolEvent a proper POJO in order for it to work with the
> serializers in Flink.
>
> Sorry for the long email.
>
> Thanks,
> Ali
>
>
> On 2015-11-11, 10:02 AM, "Fabian Hueske" <fhueske@gmail.com> wrote:
>
> >Hi Ali,
> >
> >I looked into this issue. This problem seems to be caused because the
> >deserializer reads more data than it should read.
> >This might happen because of two reasons:
> >  1) the meta information of how much data is safe to read is incorrect.
> >  2) the serializer and deserializer logic are not in sync which can cause
> >the deserializer to read more data than the serializer wrote.
> >
> >The first case is less likely: Flink writes the binary length of each
> >record in front of its serialized representation. This happens whenever
> >data is sent over the network, regardless of the data type. A bug in this
> >part would be very crucial, but is also less likely because this happens
> >very often and has not occurred yet.
> >
> >IMO, this looks like an issue of the serialization logic. Looking at your
> >code, the problem occurs when deserializing ProtocolEvent objects.
> >Is it possible that you share this class with me?
> >
> >If it is not possible to share the class, it would be good, to know the
> >field types of the Pojo and the associated TypeInformation.
> >For that you can run the code in this gist [1] which will recursively
> >print
> >the field types and their TypeInformation.
> >
> >As a temporal workaround, you can try to use Kryo to serialize and
> >deserialize your Pojos as follows:
> >ExecutionEnvironment env = ...
> >env.getConfig().enableForceKryo();
> >
> >Best,
> >Fabian
> >
> >[1] https://gist.github.com/fhueske/6c5aa386fc79ab69712b
> >
> >2015-11-11 10:38 GMT+01:00 Fabian Hueske <fhueske@gmail.com>:
> >
> >> Hi Ali,
> >>
> >> one more thing. Did that error occur once or is it reproducable?
> >>
> >> Thanks for your help,
> >> Fabian
> >>
> >> 2015-11-11 9:50 GMT+01:00 Ufuk Celebi <uce@apache.org>:
> >>
> >>> Hey Ali,
> >>>
> >>> thanks for sharing the code. I assume that the custom
> >>> ProtocolEvent, ProtocolDetailMap, Subscriber type are all PoJos. They
> >>> should not be a problem. I think this is a bug in Flink 0.9.1.
> >>>
> >>> Is it possible to re-run your program with the upcoming 0.10.0 (RC8)
> >>> version and report back?
> >>>
> >>> 1) Add
> >>> https://repository.apache.org/content/repositories/orgapacheflink-1055
> >>> as a
> >>> snapshot repository
> >>>
> >>> <repositories>
> >>> <repository>
> >>> <id>apache.snapshots</id>
> >>> <name>Apache Development Snapshot Repository</name>
> >>> <url>
> >>> https://repository.apache.org/content/repositories/orgapacheflink-1055
> >>> </url>
> >>> <releases>
> >>> <enabled>false</enabled>
> >>> </releases>
> >>> <snapshots>
> >>> <enabled>true</enabled>
> >>> </snapshots>
> >>> </repository>
> >>> </repositories>
> >>>
> >>> 2) Set the Flink dependency version to 0.10.0
> >>>
> >>> 3) Use the Flink binary matching your Hadoop installation from here:
> >>> http://people.apache.org/~mxm/flink-0.10.0-rc8/ (since you use Java,
> >>>you
> >>> can go with the Scala 2.10 builds)
> >>>
> >>> Sorry for the inconvenience! The release is about to be finished (the
> >>> voting process is already going on).
> >>>
> >>> ­ Ufuk
> >>>
> >>>
> >>> On Tue, Nov 10, 2015 at 8:05 PM, Kashmar, Ali <Ali.Kashmar@emc.com>
> >>> wrote:
> >>>
> >>> > Thanks for the quick reply guys! A lot of interest in this one. I¹ve
> >>> > attached the source code is attached. There are other supporting
> >>> > modules/classes but the main flink component is in the included zip
> >>> file.
> >>> >
> >>> > In answer to Fabian¹s question: I¹m using the 0.9.1 release right
off
> >>> the
> >>> > website (flink-0.9.1-bin-hadoop1.tgz).
> >>> >
> >>> > In answer to Ufuk¹s question: Yes I¹m using custom data types.
> >>> >
> >>> > Thanks,
> >>> > Ali
> >>> >
> >>> >
> >>> >
> >>> > On 2015-11-10, 3:01 PM, "Ufuk Celebi" <uce@apache.org> wrote:
> >>> >
> >>> > >Thanks for reporting this. Are you using any custom data types?
> >>> > >
> >>> > >If you can share your code, it would be very helpful in order to
> >>>debug
> >>> > >this.
> >>> > >
> >>> > >­ Ufuk
> >>> > >
> >>> > >On Tuesday, 10 November 2015, Fabian Hueske <fhueske@gmail.com>
> >>>wrote:
> >>> > >
> >>> > >> I agree with Robert. Looks like a bug in Flink.
> >>> > >> Maybe an off-by-one issue (violating index is 32768 and the
> >>>default
> >>> > >>memory
> >>> > >> segment size is 32KB).
> >>> > >>
> >>> > >> Which Flink version are you using?
> >>> > >> In case you are using a custom build, can you share the commit
ID
> >>>(is
> >>> > >> reported in the first lines of the JobManager log file)?
> >>> > >>
> >>> > >> Thanks, Fabian
> >>> > >>
> >>> > >> 2015-11-10 18:29 GMT+01:00 Robert Metzger <rmetzger@apache.org
> >>> > >> <javascript:;>>:
> >>> > >>
> >>> > >> > Hi Ali,
> >>> > >> >
> >>> > >> > this could be a bug in Flink.
> >>> > >> > Can you share the code of your program with us to debug
the
> >>>issue?
> >>> > >> >
> >>> > >> > On Tue, Nov 10, 2015 at 6:25 PM, Kashmar, Ali
> >>><Ali.Kashmar@emc.com
> >>> > >> <javascript:;>> wrote:
> >>> > >> >
> >>> > >> > > Hello,
> >>> > >> > >
> >>> > >> > > I¹m getting this error while running a streaming
module on a
> >>> cluster
> >>> > >> of 3
> >>> > >> > > nodes:
> >>> > >> > >
> >>> > >> > >
> >>> > >> > > java.lang.ArrayIndexOutOfBoundsException: 32768
> >>> > >> > >
> >>> > >> > > at
> >>> > >>
> >>> org.apache.flink.core.memory.MemorySegment.get(MemorySegment.java:178)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptive
> >>>>>Spa
> >>> >
> >>>
> >>>>>nningRecordDeserializer$NonSpanningWrapper.readByte(SpillingAdaptiveSp
> >>>>>ann
> >>> > >>ingRecordDeserializer.java:214)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptive
> >>>>>Spa
> >>> >
> >>>
> >>>>>nningRecordDeserializer$NonSpanningWrapper.readUnsignedByte(SpillingAd
> >>>>>apt
> >>> > >>iveSpanningRecordDeserializer.java:219)
> >>> > >> > >
> >>> > >> > > at
> >>> > >>org.apache.flink.types.StringValue.readString(StringValue.java:764)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.api.common.typeutils.base.StringSerializer.deserializ
> >>>>>e(S
> >>> > >>tringSerializer.java:68)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.api.common.typeutils.base.StringSerializer.deserializ
> >>>>>e(S
> >>> > >>tringSerializer.java:73)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.api.common.typeutils.base.StringSerializer.deserializ
> >>>>>e(S
> >>> > >>tringSerializer.java:28)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize
> >>>>>(Po
> >>> > >>joSerializer.java:499)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> > >>
> >>> >
> >>>
> >>>org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.d
> >>>e
> >>> > >>serialize(StreamRecordSerializer.java:102)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> > >>
> >>> >
> >>>
> >>>org.apache.flink.streaming.runtime.streamrecord.StreamRecordSerializer.d
> >>>e
> >>> > >>serialize(StreamRecordSerializer.java:29)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.runtime.plugable.ReusingDeserializationDelegate.read(
> >>>>>Reu
> >>> > >>singDeserializationDelegate.java:57)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptive
> >>>>>Spa
> >>> >
> >>>
> >>>>>nningRecordDeserializer.getNextRecord(SpillingAdaptiveSpanningRecordDe
> >>>>>ser
> >>> > >>ializer.java:110)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>
> org.apache.flink.streaming.runtime.io.StreamingAbstractRecordReader.ge
> >>>>>tNe
> >>> > >>xtRecord(StreamingAbstractRecordReader.java:80)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.streaming.runtime.io.StreamingMutableRecordReader.nex
> >>>>>t(S
> >>> > >>treamingMutableRecordReader.java:36)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.runtime.operators.util.ReaderIterator.next(ReaderIter
> >>>>>ato
> >>> > >>r.java:59)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.readNext(O
> >>>>>neI
> >>> > >>nputStreamTask.java:68)
> >>> > >> > >
> >>> > >> > > at
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>>
> >>>>>org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.invoke(One
> >>>>>Inp
> >>> > >>utStreamTask.java:101)
> >>> > >> > >
> >>> > >> > > at
> >>>org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
> >>> > >> > >
> >>> > >> > > at java.lang.Thread.run(Thread.java:745)
> >>> > >> > >
> >>> > >> > >
> >>> > >> > > Here¹s the configuration for each node:
> >>> > >> > >
> >>> > >> > >
> >>> > >> > > jobmanager.heap.mb: 2048
> >>> > >> > >
> >>> > >> > > taskmanager.heap.mb: 4096
> >>> > >> > >
> >>> > >> > > taskmanager.numberOfTaskSlots: 5
> >>> > >> > >
> >>> > >> > >
> >>> > >> > > I¹m not even sure where to start with this one
so any help is
> >>> > >> > appreciated.
> >>> > >> > >
> >>> > >> > >
> >>> > >> > > Thanks,
> >>> > >> > >
> >>> > >> > > Ali
> >>> > >> > >
> >>> > >> >
> >>> > >>
> >>> >
> >>> >
> >>>
> >>
> >>
>
>

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