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https://issues.apache.org/jira/browse/FLINK-12142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16813179#comment-16813179
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Aljoscha Krettek commented on FLINK-12142:
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Would this be what you're looking for?
https://github.com/apache/flink/blob/e1d1234477c731fe3f398c7f3f12123f73764242/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/StreamOperator.java#L114
> Add beforeSnapshot method to StreamOperator interface
> -----------------------------------------------------
>
> Key: FLINK-12142
> URL: https://issues.apache.org/jira/browse/FLINK-12142
> Project: Flink
> Issue Type: New Feature
> Components: Runtime / Checkpointing
> Reporter: Gyula Fora
> Priority: Trivial
>
> Right now, when a stream task receives a triggerCheckpoint call, it
> immediately forwards the checkpoint barrier and performs the checkpoint
> operation under the checkpoint lock.
> This mechanism doesn't allow the stream operations to implement any logic
> that should be performed before the snapshot is triggered in order to ensure
> state consistency.
> Some examples would be:
> * Flushing any state (or other kind of) cache that is implemented in the
> operator layer
> * Wait for pending operations (maybe with a different async execution model)
> The method could for instance look simply like this in the StreamOperator
> interface:
> {{default void beforeSnapshot(long checkpointId, long timestamp) throws
> Exception {};}}
> This method should then be called before the barrier is sent downstream still
> outside the checkpoint lock.
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