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https://issues.apache.org/jira/browse/FLINK-9428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen resolved FLINK-9428.
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Resolution: Implemented
Implemented in e1d1234477c731fe3f398c7f3f12123f73764242
> Allow operators to flush data on checkpoint pre-barrier
> -------------------------------------------------------
>
> Key: FLINK-9428
> URL: https://issues.apache.org/jira/browse/FLINK-9428
> Project: Flink
> Issue Type: New Feature
> Components: State Backends, Checkpointing
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Priority: Major
> Fix For: 1.6.0
>
>
> Some operators maintain some small transient state that may be inefficient to
> checkpoint, especially when it would need to be checkpointed also in a
> re-scalable way.
> An example are opportunistic pre-aggregation operators, which have small the
> pre-aggregation state that is frequently flushed downstream.
> Rather that persisting that state in a checkpoint, it can make sense to flush
> the data downstream upon a checkpoint, to let it be part of the downstream
> operator's state.
> This feature is sensitive, because flushing state has a clean implication on
> the downstream operator's checkpoint alignment. However, used with care, and
> with the new back-pressure-based checkpoint alignment, this feature can be
> very useful.
> Because it is sensitive, I suggest to make this only an internal feature
> (accessible to operators) and NOT expose it in the public API at this point.
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