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https://issues.apache.org/jira/browse/FLINK-4169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966258#comment-15966258
]
Shashank Agarwal commented on FLINK-4169:
-----------------------------------------
Again getting this error in flink 1.2, Running on yarn cluster. After changing
state backend from Rocksdb it's working fine.
```
04/12/2017 10:05:04 Job execution switched to status FAILING.
java.lang.RuntimeException: Could not deserialize NFA.
at org.apache.flink.cep.nfa.NFA$Serializer.deserialize(NFA.java:538)
at org.apache.flink.cep.nfa.NFA$Serializer.deserialize(NFA.java:469)
at
org.apache.flink.contrib.streaming.state.RocksDBValueState.value(RocksDBValueState.java:81)
at
org.apache.flink.cep.operator.AbstractKeyedCEPPatternOperator.getNFA(AbstractKeyedCEPPatternOperator.java:124)
at
org.apache.flink.cep.operator.AbstractCEPBasePatternOperator.processElement(AbstractCEPBasePatternOperator.java:72)
at
org.apache.flink.cep.operator.AbstractKeyedCEPPatternOperator.processElement(AbstractKeyedCEPPatternOperator.java:162)
at
org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:185)
at
org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:63)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:272)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException:
co.ronak.nto.Job$$anon$18$$anon$21$$anon$3
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:626)
at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
at
java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:501)
at
org.apache.flink.api.scala.typeutils.TraversableSerializer.readObject(TraversableSerializer.scala:53)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1900)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1924)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1707)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1345)
at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1924)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
at
java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:501)
at
org.apache.flink.cep.NonDuplicatingTypeSerializer.readObject(NonDuplicatingTypeSerializer.java:190)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1900)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
at
java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:501)
at org.apache.flink.cep.nfa.NFA.readObject(NFA.java:394)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1900)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at org.apache.flink.cep.nfa.NFA$Serializer.deserialize(NFA.java:535)
... 10 more
```
> CEP Does Not Work with RocksDB StateBackend
> -------------------------------------------
>
> Key: FLINK-4169
> URL: https://issues.apache.org/jira/browse/FLINK-4169
> Project: Flink
> Issue Type: Bug
> Components: CEP
> Affects Versions: 1.0.0, 1.1.0, 1.0.1, 1.0.2, 1.0.3
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Blocker
>
> A job will never match any patterns because {{ValueState.update()}} is not
> called in the keyed CEP operators for updating the {{NFA}} state and the
> priority queue state.
> The reason why it works for other state backends is that they are very lax in
> their handling of state: if the object returned from {{ValueState.value())}}
> is mutable changes to this will be reflected in checkpoints even if
> {{ValueState.update()}} is not called. RocksDB, on the other hand, does
> always deserialize/serialize state values when accessing/updating them, so
> changes to the returned object will not be reflected in the state unless
> {{update()}} is called.
> We should fix this and also add a test for it. This might be tricky because
> we have to pull together RocksDB and CEP.
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