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From "Dingyu Yang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (S4-131) checkpoint error "CancellationException"
Date Thu, 28 Mar 2013 01:39:15 GMT

     [ https://issues.apache.org/jira/browse/S4-131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dingyu Yang  resolved S4-131.
-----------------------------

    Resolution: Fixed
    
> checkpoint error "CancellationException" 
> -----------------------------------------
>
>                 Key: S4-131
>                 URL: https://issues.apache.org/jira/browse/S4-131
>             Project: Apache S4
>          Issue Type: Bug
>    Affects Versions: 0.6
>         Environment: The configure like this:
> App program:
> ...
>  wordSumPE.setCheckpointingConfig(new CheckpointingConfig.Builder(CheckpointingMode.TIME).frequency(20).timeUnit(TimeUnit.SECONDS).build());
> ...
> delpoy:
> ./s4 deploy -a=example.wordcountApp -c=testCluster1 -appName=wordApp -p=s4.checkpointing.filesystem.storageRootPath=/home/tmp/s4checkpoint
-emc=org.apache.s4.core.ft.FileSystemBackendCheckpointingModule
>            Reporter: Dingyu Yang 
>            Priority: Minor
>             Fix For: 0.7
>
>
> 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];[word]
> 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
> I debug the program and at the position : SaveStateTask.run  "futureSerializedState.get(1000,
TimeUnit.MILLISECONDS)." The futureTask get "CancellationException" displayed above error.


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