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https://issues.apache.org/jira/browse/FLINK-4149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek resolved FLINK-4149.
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Resolution: Fixed
Done in
https://github.com/apache/flink/commit/ac06146719e1061aecdc7f18c95913ac9009a711
> 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: 1.0.0, 1.1.0, 1.0.1, 1.0.2, 1.0.3
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Blocker
> Fix For: 1.1.0
>
>
> A job that uses CEP 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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