ASF GitHub Bot commented on FLINK-8876:

Github user StephanEwen commented on the issue:

    Thanks for the great review.
    Good catch, I bet the missing check against the current thread is the 
reason for the test failure.

> Improve concurrent access handling in stateful serializers
> ----------------------------------------------------------
>                 Key: FLINK-8876
>                 URL: https://issues.apache.org/jira/browse/FLINK-8876
>             Project: Flink
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Major
>             Fix For: 1.5.0, 1.6.0
> Some stateful serializers produce incorrect results when accidentally 
> accessed by multiple threads concurrently.
>  To better catch these cases, I suggest to add concurrency checks that are 
> active only when debug logging is enabled, and during test runs.
> This is inspired by Kryo's checks for concurrent access.

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