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https://issues.apache.org/jira/browse/FLINK-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15306839#comment-15306839
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ASF GitHub Bot commented on FLINK-3405:
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Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/2047#issuecomment-222532431
close() is called by all operators when the operator finishes without an
exception of canceling. Have a look at the AbstractUDFStream
Stop() is thought to be merely a trigger to make an unbounded source stop
its unbounded loop. After that, it should finish like a bounded source,
including the close() call.
> Extend NiFiSource with interface StoppableFunction
> --------------------------------------------------
>
> Key: FLINK-3405
> URL: https://issues.apache.org/jira/browse/FLINK-3405
> Project: Flink
> Issue Type: Improvement
> Components: Streaming Connectors
> Reporter: Matthias J. Sax
> Assignee: Suneel Marthi
> Fix For: 1.1.0, 1.0.4
>
>
> Nifi source is not stoppable right now. To make it stoppable, is must
> implement {{StoppableFunction}}. Implementing method {{stop()}} must ensure,
> that the source stops receiving new messages from Nifi and issues a final
> checkpoint. Afterwards, {{run()}} must return.
> When implementing this, keep in mind, that the gathered checkpoint might
> later be used as a savepoint.
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