Stephan Ewen created FLINK-8876:

             Summary: Improve concurrent access handling in stateful serializers
                 Key: FLINK-8876
             Project: Flink
          Issue Type: Improvement
          Components: Core
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             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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