[jira] [Commented] (FLINK-9034) State Descriptors drop TypeInformation on serialization

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-9034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16422550#comment-16422550 ] 

ASF GitHub Bot commented on FLINK-9034:
---------------------------------------

Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/5732
  
    Manually merged in f3a519712fb31f7b71181e876c3c3d5fff08eb71


> State Descriptors drop TypeInformation on serialization
> -------------------------------------------------------
>
>                 Key: FLINK-9034
>                 URL: https://issues.apache.org/jira/browse/FLINK-9034
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.5.0, 1.4.2
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Major
>             Fix For: 1.5.0
>
>
> The following code currently causes problems
> {code}
> public class MyFunction extends RichMapFunction<A, B>  {
>     private final ValueStateDescriptor<MyType> descr = new ValueStateDescriptor<>("state name", MyType.class);
>     private ValueState<MyType> state;
>     @Override
>     public void open() {
>         state = getRuntimeContext().getValueState(descr);
>     }
> }
> {code}
> The problem is that the state descriptor drops the type information and creates a serializer before serialization as part of shipping the function in the cluster. To do that, it initializes the serializer with an empty execution config, making serialization inconsistent.
> This is mainly an artifact from the days when dropping the type information before shipping was necessary, because the type info was not serializable. It now is, and we can fix that bug.



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