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https://issues.apache.org/jira/browse/FLINK-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15306625#comment-15306625
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ASF GitHub Bot commented on FLINK-3405:
---------------------------------------

Github user smarthi commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2047#discussion_r65068847
  
    --- Diff: 
flink-streaming-connectors/flink-connector-nifi/src/main/java/org/apache/flink/streaming/connectors/nifi/NiFiSource.java
 ---
    @@ -143,4 +144,13 @@ public void close() throws Exception {
                client.close();
        }
     
    + /**
    +   * {@inheritDoc}
    +   * <p>
    +   * Sets the {@link #isRunning} flag to {@code false}.
    +   */
    +   @Override
    +   public void stop() {
    +           this.isRunning = false;
    --- End diff --
    
    I guess we need to for now, until stop() is wired into the StreamGraph i.e. 
Thanks for pointing that out.


> 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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