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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