[jira] [Created] (FLINK-2664) Remove partitioned states when set to null

[Shang Yuanchun (Jira)]

Gyula Fora created FLINK-2664:
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             Summary: Remove partitioned states when set to null
                 Key: FLINK-2664
                 URL: https://issues.apache.org/jira/browse/FLINK-2664
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Gyula Fora
            Assignee: Gyula Fora


Currently there is no way to remove a specific key from the partitioned state stored at streaming operators, which can cause unnecessary state accumulation.

I suggest to remove the partitioned state for the current input when the state is set to null, and upon next retrieval simply return the default value. This allows the implementation of streaming programs that can garbage collect their own unwanted state.



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