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https://issues.apache.org/jira/browse/FLINK-15969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igal Shilman closed FLINK-15969.
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Resolution: Won't Fix
There is no need for state multiplexing anymore
> Do not multiplex both PersistedValue and PersistedTable with a single
> MapState state handle
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-15969
> URL: https://issues.apache.org/jira/browse/FLINK-15969
> Project: Flink
> Issue Type: Improvement
> Components: Stateful Functions
> Affects Versions: statefun-1.1
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Major
>
> Currently in Stateful Functions, {{PersistedValue}} and {{PersistedTable}}
> are multiplexed under a single {{MapState}}. I propose to split them up, and
> have them multiplexed with 2 separate {{MapState}}, for the following reasons:
> * There's already a problem with the (to-be-introduced) state reader /
> analyzer, that to read a single function's persisted state values, you have
> to iterate through ALL keys (which includes state of other functions) since
> we multiplex everything into a single handle.
> * If you multiplex both tables and values into a single state handle, this
> will because even more of a problem in the future, say when the user just
> wants to read table state and not value state.
> * If we do decide to separate the handles, we can slim down the
> {{MultiplexedStateKey}} type a bit, by having a separate
> {{MultiplexedTableStateKey}} that has a {{ByteString userKey}} field and a
> {{MultiplexedStateKey prefix}} field. There's already a minor concern with
> the way we use {{MultiplexedStateKey}}: Does protobuf repeated fields require
> some extra metadata written? If yes, its a tad bit redundant size-wise in
> this case since we only ever have 1 user key added.
> * When multiplexing both value states and table state under the same state
> handle, the key is essentially ambiguous - there is a possibility that a
> value state's key in {{MapState}} can be set up to overwrite another key of a
> table state.
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