[jira] [Commented] (FLINK-2740) Create data consumer for Apache NiFi

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14939642#comment-14939642 ] 

ASF GitHub Bot commented on FLINK-2740:
---------------------------------------

Github user rmetzger commented on the pull request:

    https://github.com/apache/flink/pull/1198#issuecomment-144688632
  
    I followed the tutorial for Nifi that you posted into the pull request. Thanks a lot for the good instructions. I was able to start it and get it to run in a few minutes.
    
    However, when starting the source topology, I got the following error:
    ```
    10/01/2015 12:23:47	Source: Custom Source -> Map -> Sink: Unnamed(2/8) switched to RUNNING 
    10/01/2015 12:23:47	Source: Custom Source -> Map -> Sink: Unnamed(4/8) switched to FAILED 
    java.lang.NullPointerException
    	at org.apache.flink.streaming.connectors.nifi.NiFiSource.run(NiFiSource.java:65)
    	at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:57)
    	at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:57)
    	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:198)
    	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:579)
    	at java.lang.Thread.run(Thread.java:745)
    ```
    
    it seems that the `final Transaction transaction = client.createTransaction(TransferDirection.RECEIVE);` call is returning null.
    
    This is what my NiFi screen looks like: http://i.imgur.com/FDFgrdu.png



> Create data consumer for Apache NiFi
> ------------------------------------
>
>                 Key: FLINK-2740
>                 URL: https://issues.apache.org/jira/browse/FLINK-2740
>             Project: Flink
>          Issue Type: New Feature
>          Components: Streaming Connectors
>            Reporter: Kostas Tzoumas
>            Assignee: Joseph Witt
>
> Create a connector to Apache NiFi to create Flink DataStreams from NiFi flows



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