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https://issues.apache.org/jira/browse/FLINK-9122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16423637#comment-16423637
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Aljoscha Krettek commented on FLINK-9122:
-----------------------------------------
Yes, this is a problem because CEP serialises user code in the state that it
keeps and doesn't correctly use the user-code class loader when deserialising.
We're trying to fix this by removing custom serialisation from state for the
next version.
> NFASerialize deserailze failed and cause other exception
> --------------------------------------------------------
>
> Key: FLINK-9122
> URL: https://issues.apache.org/jira/browse/FLINK-9122
> Project: Flink
> Issue Type: Bug
> Components: CEP
> Affects Versions: 1.4.1, 1.4.2
> Reporter: aitozi
> Priority: Critical
>
> when running the job , it failed with the excetion "Caused by:
> java.lang.IllegalStateException: Could not find previous entry with key:
> passengerReserveOrder" and when refer to the log on taskmanger, i find error
> in taskmanager.err
>
> {code:java}
> at
> org.apache.flink.streaming.runtime.streamstatus.StatusWatermarkValve.inputWatermark(StatusWatermarkValve.java:108)
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:188)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:69)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:263)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> at java.lang.Thread.run(Thread.java:745)
> java.lang.ClassNotFoundException:
> com.xxxxxxi.app.ReservationCancelMonitorApp$3
> at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> at sun.misc.Launcher$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.readObject(ObjectInputStream.java:371)
> at
> org.apache.flink.cep.nfa.NFA$NFASerializer.deserializeCondition(NFA.java:1171)
> at
> org.apache.flink.cep.nfa.NFA$NFASerializer.deserializeStates(NFA.java:1129)
> at org.apache.flink.cep.nfa.NFA$NFASerializer.deserialize(NFA.java:917)
> at org.apache.flink.cep.nfa.NFA$NFASerializer.deserialize(NFA.java:820)
> at
> org.apache.flink.contrib.streaming.state.RocksDBValueState.value(RocksDBValueState.java:82)
> at
> org.apache.flink.cep.operator.AbstractKeyedCEPPatternOperator.getNFA(AbstractKeyedCEPPatternOperator.java:299)
> at
> org.apache.flink.cep.operator.AbstractKeyedCEPPatternOperator.onEventTime(AbstractKeyedCEPPatternOperator.java:229)
> at
> org.apache.flink.streaming.api.operators.HeapInternalTimerService.advanceWatermark(HeapInternalTimerService.java:275)
> at
> org.apache.flink.streaming.api.operators.InternalTimeServiceManager.advanceWatermark(InternalTimeServiceManager.java:107)
> {code}
> when i change the backend from rocksdb to memory and fs, this is disappear. i
> use the code in master branch, the problem is still there. i have two
> questions :
> 1. Is the "Caused by: java.lang.IllegalStateException: Could not find
> previous entry with key" this caused by the error in serialization
> 2. why the exception appear in taskmanager.err file not in taskmanager.log
> file
> @ [~aljoscha] [~kkl0u]
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