Dingyu Yang created S4-131:
-------------------------------
Summary: 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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