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https://issues.apache.org/jira/browse/FLINK-21027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu updated FLINK-21027:
----------------------------
Summary: Add isStateKeyValueSerialized() method to KeyedStateBackend
interface (was: Add isKeyValueImmutable() method to KeyedStateBackend
interface)
> Add isStateKeyValueSerialized() method to KeyedStateBackend interface
> ---------------------------------------------------------------------
>
> Key: FLINK-21027
> URL: https://issues.apache.org/jira/browse/FLINK-21027
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / State Backends
> Reporter: Jark Wu
> Priority: Major
>
> In Table/SQL operators, we have some optimizations that reuse objects of keys
> and records. For example, we buffer input records in {{BytesMultiMap}} and
> use the reused object to map to the underlying memory segment to reduce bytes
> copy.
> However, if we put the reused key and value into Heap statebackend, the
> result will be wrong, because it is not allowed to mutate keys and values in
> Heap statebackend.
> Therefore, it would be great if {{KeyedStateBackend}} can expose such API, so
> that Table/SQL can dynamically decide whether to copy the keys and values
> before putting into state.
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