[jira] [Created] (FLINK-18203) Reduce objects usage in redistributing union states

[Shang Yuanchun (Jira)]

Jiayi Liao created FLINK-18203:
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             Summary: Reduce objects usage in redistributing union states
                 Key: FLINK-18203
                 URL: https://issues.apache.org/jira/browse/FLINK-18203
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Checkpointing
    Affects Versions: 1.10.1
            Reporter: Jiayi Liao


#{{RoundRobinOperatorStateRepartitioner}}#{{repartitionUnionState}} creates a new {{OperatorStreamStateHandle}} instance for every {{StreamStateHandle}} instance used in every execution, which causes the number of new {{OperatorStreamStateHandle}} instances up to m * n (jobvertex parallelism * count of all executions' StreamStateHandle).

But in fact, all executions can share the same collection of {{StreamStateHandle}} because it's **union state**.





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