[jira] [Created] (FLINK-4149) Fix Serialization of NFA in AbstractKeyedCEPPatternOperator

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

Aljoscha Krettek created FLINK-4149:
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             Summary: Fix Serialization of NFA in AbstractKeyedCEPPatternOperator
                 Key: FLINK-4149
                 URL: https://issues.apache.org/jira/browse/FLINK-4149
             Project: Flink
          Issue Type: Bug
          Components: CEP
    Affects Versions: 1.1.0
            Reporter: Aljoscha Krettek
            Priority: Blocker
             Fix For: 1.1.0


A job that uses CEP with event time fails upon restore with a {{NullPointerException}} in {{NFA.process()}}. The reason seems to be that field {{computationStates}} is {{null}}. This field is transient and read in a custom {{readObject()}} method.

In {{AbstractKeyedCEPPatternOperator}} this snipped is used to construct a {{StateDescriptor}} for an {{NFA}} state:

{code}
new ValueStateDescriptor<NFA<IN>>(
    NFA_OPERATOR_STATE_NAME,
    new KryoSerializer<NFA<IN>>((Class<NFA<IN>>) (Class<?>) NFA.class, getExecutionConfig()),
    null)
{code}

It seems Kryo does not invoke {{readObject}}/{{writeObject}}. We probably need a custom {{TypeSerializer}} for {{NFA}} to solve the problem.



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