incubator-s4-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Matthieu Morel <mmo...@apache.org>
Subject Re: checkpoint problem
Date Mon, 25 Mar 2013 17:25:31 GMT
This looks like a bug, from a race condition in the serializer.

Can you file a bug? Also, are you able to reproduce it systematically?

Thanks,

Matthieu

On Mar 23, 2013, at 07:33 , Dingyu Yang wrote:

> Hi,all
> I run a checkpoint example and get some problems.
> The version is S4 0.6 RC3 .
> ./s4 deploy -a=example.wordcountApp -c=testCluster1 -appName=wordApp -p=s4.checkpointing.filesystem.storageRootPath=/home/tmp/s4checkpoint
-emc=org.apache.s4.core.ft.FileSystemBackendCheckpointingModule
> 
> Then I get this error:
> 14:21:50.251 [Checkpointing-storage-0] WARN  org.apache.s4.core.ft.SaveStateTask - Cannot
save checkpoint : [PROTO_ID];[KEY] --> [example.WordSumPE];[./s4]
> java.util.concurrent.ExecutionException: com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException
> Serialization trace:
> classes (sun.misc.Launcher$AppClassLoader)
> contextClassLoader (java.lang.Thread)
> thread (java.util.concurrent.ThreadPoolExecutor$Worker)
> workers (java.util.concurrent.ThreadPoolExecutor)
> fetchingThreadPool (org.apache.s4.core.ft.SafeKeeper)
> checkpointingFramework (example.wordcountApp)
> app (org.apache.s4.core.Stream)
> downStream (example.WordSumPE)
>     at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:232) ~[na:1.6.0_22]
>     at java.util.concurrent.FutureTask.get(FutureTask.java:91) ~[na:1.6.0_22]
>     at org.apache.s4.core.ft.SaveStateTask.run(SaveStateTask.java:66) ~[bin/:na]
>     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
[na:1.6.0_22]
>     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
[na:1.6.0_22]
>     at java.lang.Thread.run(Thread.java:662) [na:1.6.0_22]
> Caused by: com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException
> Serialization trace:
> classes (sun.misc.Launcher$AppClassLoader)
> contextClassLoader (java.lang.Thread)
> thread (java.util.concurrent.ThreadPoolExecutor$Worker)
> workers (java.util.concurrent.ThreadPoolExecutor)
> fetchingThreadPool (org.apache.s4.core.ft.SafeKeeper)
> checkpointingFramework (example.wordcountApp)
> app (org.apache.s4.core.Stream)
> downStream (example.WordSumPE)
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:552) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:68)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:18)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:571) ~[kryo-2.20.jar:na]
>     at org.apache.s4.comm.serialize.KryoSerDeser.serialize(KryoSerDeser.java:91) ~[bin/:na]
>     at org.apache.s4.core.ProcessingElement.serializeState(ProcessingElement.java:802)
~[bin/:na]
>     at org.apache.s4.core.ft.SerializeTask.call(SerializeTask.java:42) ~[bin/:na]
>     at org.apache.s4.core.ft.SerializeTask.call(SerializeTask.java:1) ~[bin/:na]
>     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) ~[na:1.6.0_22]
>     at java.util.concurrent.FutureTask.run(FutureTask.java:138) ~[na:1.6.0_22]
>     ... 3 common frames omitted
> Caused by: java.util.ConcurrentModificationException: null
>     at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) ~[na:1.6.0_22]
>     at java.util.AbstractList$Itr.next(AbstractList.java:343) ~[na:1.6.0_22]
>     at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:74)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:18)
~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504) ~[kryo-2.20.jar:na]
>     at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
~[kryo-2.20.jar:na]
>     ... 35 common frames omitted
> 
> 


Mime
View raw message